Add qemu 2.4.0

Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>

5 files changed, 5545 insertions, 0 deletions

diff --git a/qemu/hw/vfio/Makefile.objs b/qemu/hw/vfio/Makefile.objs
new file mode 100644
index 000000000..d540c9d14
--- /dev/null
+++ b/qemu/hw/vfio/Makefile.objs
@@ -0,0 +1,6 @@
+ifeq ($(CONFIG_LINUX), y)
+obj-$(CONFIG_SOFTMMU) += common.o
+obj-$(CONFIG_PCI) += pci.o
+obj-$(CONFIG_SOFTMMU) += platform.o
+obj-$(CONFIG_SOFTMMU) += calxeda-xgmac.o
+endif
diff --git a/qemu/hw/vfio/calxeda-xgmac.c b/qemu/hw/vfio/calxeda-xgmac.c
new file mode 100644
index 000000000..eb914f0d0
--- /dev/null
+++ b/qemu/hw/vfio/calxeda-xgmac.c
@@ -0,0 +1,55 @@
+/*
+ * calxeda xgmac VFIO device
+ *
+ * Copyright Linaro Limited, 2014
+ *
+ * Authors:
+ *  Eric Auger <eric.auger@linaro.org>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#include "hw/vfio/vfio-calxeda-xgmac.h"
+
+static void calxeda_xgmac_realize(DeviceState *dev, Error **errp)
+{
+    VFIOPlatformDevice *vdev = VFIO_PLATFORM_DEVICE(dev);
+    VFIOCalxedaXgmacDeviceClass *k = VFIO_CALXEDA_XGMAC_DEVICE_GET_CLASS(dev);
+
+    vdev->compat = g_strdup("calxeda,hb-xgmac");
+
+    k->parent_realize(dev, errp);
+}
+
+static const VMStateDescription vfio_platform_calxeda_xgmac_vmstate = {
+    .name = TYPE_VFIO_CALXEDA_XGMAC,
+    .unmigratable = 1,
+};
+
+static void vfio_calxeda_xgmac_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    VFIOCalxedaXgmacDeviceClass *vcxc =
+        VFIO_CALXEDA_XGMAC_DEVICE_CLASS(klass);
+    vcxc->parent_realize = dc->realize;
+    dc->realize = calxeda_xgmac_realize;
+    dc->desc = "VFIO Calxeda XGMAC";
+    dc->vmsd = &vfio_platform_calxeda_xgmac_vmstate;
+}
+
+static const TypeInfo vfio_calxeda_xgmac_dev_info = {
+    .name = TYPE_VFIO_CALXEDA_XGMAC,
+    .parent = TYPE_VFIO_PLATFORM,
+    .instance_size = sizeof(VFIOCalxedaXgmacDevice),
+    .class_init = vfio_calxeda_xgmac_class_init,
+    .class_size = sizeof(VFIOCalxedaXgmacDeviceClass),
+};
+
+static void register_calxeda_xgmac_dev_type(void)
+{
+    type_register_static(&vfio_calxeda_xgmac_dev_info);
+}
+
+type_init(register_calxeda_xgmac_dev_type)
diff --git a/qemu/hw/vfio/common.c b/qemu/hw/vfio/common.c
new file mode 100644
index 000000000..85ee9b005
--- /dev/null
+++ b/qemu/hw/vfio/common.c
@@ -0,0 +1,972 @@
+/*
+ * generic functions used by VFIO devices
+ *
+ * Copyright Red Hat, Inc. 2012
+ *
+ * Authors:
+ *  Alex Williamson <alex.williamson@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ * Based on qemu-kvm device-assignment:
+ *  Adapted for KVM by Qumranet.
+ *  Copyright (c) 2007, Neocleus, Alex Novik (alex@neocleus.com)
+ *  Copyright (c) 2007, Neocleus, Guy Zana (guy@neocleus.com)
+ *  Copyright (C) 2008, Qumranet, Amit Shah (amit.shah@qumranet.com)
+ *  Copyright (C) 2008, Red Hat, Amit Shah (amit.shah@redhat.com)
+ *  Copyright (C) 2008, IBM, Muli Ben-Yehuda (muli@il.ibm.com)
+ */
+
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <linux/vfio.h>
+
+#include "hw/vfio/vfio-common.h"
+#include "hw/vfio/vfio.h"
+#include "exec/address-spaces.h"
+#include "exec/memory.h"
+#include "hw/hw.h"
+#include "qemu/error-report.h"
+#include "sysemu/kvm.h"
+#include "trace.h"
+
+struct vfio_group_head vfio_group_list =
+    QLIST_HEAD_INITIALIZER(vfio_group_list);
+struct vfio_as_head vfio_address_spaces =
+    QLIST_HEAD_INITIALIZER(vfio_address_spaces);
+
+#ifdef CONFIG_KVM
+/*
+ * We have a single VFIO pseudo device per KVM VM.  Once created it lives
+ * for the life of the VM.  Closing the file descriptor only drops our
+ * reference to it and the device's reference to kvm.  Therefore once
+ * initialized, this file descriptor is only released on QEMU exit and
+ * we'll re-use it should another vfio device be attached before then.
+ */
+static int vfio_kvm_device_fd = -1;
+#endif
+
+/*
+ * Common VFIO interrupt disable
+ */
+void vfio_disable_irqindex(VFIODevice *vbasedev, int index)
+{
+    struct vfio_irq_set irq_set = {
+        .argsz = sizeof(irq_set),
+        .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER,
+        .index = index,
+        .start = 0,
+        .count = 0,
+    };
+
+    ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
+}
+
+void vfio_unmask_single_irqindex(VFIODevice *vbasedev, int index)
+{
+    struct vfio_irq_set irq_set = {
+        .argsz = sizeof(irq_set),
+        .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK,
+        .index = index,
+        .start = 0,
+        .count = 1,
+    };
+
+    ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
+}
+
+void vfio_mask_single_irqindex(VFIODevice *vbasedev, int index)
+{
+    struct vfio_irq_set irq_set = {
+        .argsz = sizeof(irq_set),
+        .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_MASK,
+        .index = index,
+        .start = 0,
+        .count = 1,
+    };
+
+    ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
+}
+
+/*
+ * IO Port/MMIO - Beware of the endians, VFIO is always little endian
+ */
+void vfio_region_write(void *opaque, hwaddr addr,
+                       uint64_t data, unsigned size)
+{
+    VFIORegion *region = opaque;
+    VFIODevice *vbasedev = region->vbasedev;
+    union {
+        uint8_t byte;
+        uint16_t word;
+        uint32_t dword;
+        uint64_t qword;
+    } buf;
+
+    switch (size) {
+    case 1:
+        buf.byte = data;
+        break;
+    case 2:
+        buf.word = cpu_to_le16(data);
+        break;
+    case 4:
+        buf.dword = cpu_to_le32(data);
+        break;
+    default:
+        hw_error("vfio: unsupported write size, %d bytes", size);
+        break;
+    }
+
+    if (pwrite(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) {
+        error_report("%s(%s:region%d+0x%"HWADDR_PRIx", 0x%"PRIx64
+                     ",%d) failed: %m",
+                     __func__, vbasedev->name, region->nr,
+                     addr, data, size);
+    }
+
+    trace_vfio_region_write(vbasedev->name, region->nr, addr, data, size);
+
+    /*
+     * A read or write to a BAR always signals an INTx EOI.  This will
+     * do nothing if not pending (including not in INTx mode).  We assume
+     * that a BAR access is in response to an interrupt and that BAR
+     * accesses will service the interrupt.  Unfortunately, we don't know
+     * which access will service the interrupt, so we're potentially
+     * getting quite a few host interrupts per guest interrupt.
+     */
+    vbasedev->ops->vfio_eoi(vbasedev);
+}
+
+uint64_t vfio_region_read(void *opaque,
+                          hwaddr addr, unsigned size)
+{
+    VFIORegion *region = opaque;
+    VFIODevice *vbasedev = region->vbasedev;
+    union {
+        uint8_t byte;
+        uint16_t word;
+        uint32_t dword;
+        uint64_t qword;
+    } buf;
+    uint64_t data = 0;
+
+    if (pread(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) {
+        error_report("%s(%s:region%d+0x%"HWADDR_PRIx", %d) failed: %m",
+                     __func__, vbasedev->name, region->nr,
+                     addr, size);
+        return (uint64_t)-1;
+    }
+    switch (size) {
+    case 1:
+        data = buf.byte;
+        break;
+    case 2:
+        data = le16_to_cpu(buf.word);
+        break;
+    case 4:
+        data = le32_to_cpu(buf.dword);
+        break;
+    default:
+        hw_error("vfio: unsupported read size, %d bytes", size);
+        break;
+    }
+
+    trace_vfio_region_read(vbasedev->name, region->nr, addr, size, data);
+
+    /* Same as write above */
+    vbasedev->ops->vfio_eoi(vbasedev);
+
+    return data;
+}
+
+const MemoryRegionOps vfio_region_ops = {
+    .read = vfio_region_read,
+    .write = vfio_region_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+/*
+ * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86
+ */
+static int vfio_dma_unmap(VFIOContainer *container,
+                          hwaddr iova, ram_addr_t size)
+{
+    struct vfio_iommu_type1_dma_unmap unmap = {
+        .argsz = sizeof(unmap),
+        .flags = 0,
+        .iova = iova,
+        .size = size,
+    };
+
+    if (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
+        error_report("VFIO_UNMAP_DMA: %d", -errno);
+        return -errno;
+    }
+
+    return 0;
+}
+
+static int vfio_dma_map(VFIOContainer *container, hwaddr iova,
+                        ram_addr_t size, void *vaddr, bool readonly)
+{
+    struct vfio_iommu_type1_dma_map map = {
+        .argsz = sizeof(map),
+        .flags = VFIO_DMA_MAP_FLAG_READ,
+        .vaddr = (__u64)(uintptr_t)vaddr,
+        .iova = iova,
+        .size = size,
+    };
+
+    if (!readonly) {
+        map.flags |= VFIO_DMA_MAP_FLAG_WRITE;
+    }
+
+    /*
+     * Try the mapping, if it fails with EBUSY, unmap the region and try
+     * again.  This shouldn't be necessary, but we sometimes see it in
+     * the the VGA ROM space.
+     */
+    if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 ||
+        (errno == EBUSY && vfio_dma_unmap(container, iova, size) == 0 &&
+         ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) {
+        return 0;
+    }
+
+    error_report("VFIO_MAP_DMA: %d", -errno);
+    return -errno;
+}
+
+static bool vfio_listener_skipped_section(MemoryRegionSection *section)
+{
+    return (!memory_region_is_ram(section->mr) &&
+            !memory_region_is_iommu(section->mr)) ||
+           /*
+            * Sizing an enabled 64-bit BAR can cause spurious mappings to
+            * addresses in the upper part of the 64-bit address space.  These
+            * are never accessed by the CPU and beyond the address width of
+            * some IOMMU hardware.  TODO: VFIO should tell us the IOMMU width.
+            */
+           section->offset_within_address_space & (1ULL << 63);
+}
+
+static void vfio_iommu_map_notify(Notifier *n, void *data)
+{
+    VFIOGuestIOMMU *giommu = container_of(n, VFIOGuestIOMMU, n);
+    VFIOContainer *container = giommu->container;
+    IOMMUTLBEntry *iotlb = data;
+    MemoryRegion *mr;
+    hwaddr xlat;
+    hwaddr len = iotlb->addr_mask + 1;
+    void *vaddr;
+    int ret;
+
+    trace_vfio_iommu_map_notify(iotlb->iova,
+                                iotlb->iova + iotlb->addr_mask);
+
+    /*
+     * The IOMMU TLB entry we have just covers translation through
+     * this IOMMU to its immediate target.  We need to translate
+     * it the rest of the way through to memory.
+     */
+    rcu_read_lock();
+    mr = address_space_translate(&address_space_memory,
+                                 iotlb->translated_addr,
+                                 &xlat, &len, iotlb->perm & IOMMU_WO);
+    if (!memory_region_is_ram(mr)) {
+        error_report("iommu map to non memory area %"HWADDR_PRIx"",
+                     xlat);
+        goto out;
+    }
+    /*
+     * Translation truncates length to the IOMMU page size,
+     * check that it did not truncate too much.
+     */
+    if (len & iotlb->addr_mask) {
+        error_report("iommu has granularity incompatible with target AS");
+        goto out;
+    }
+
+    if ((iotlb->perm & IOMMU_RW) != IOMMU_NONE) {
+        vaddr = memory_region_get_ram_ptr(mr) + xlat;
+        ret = vfio_dma_map(container, iotlb->iova,
+                           iotlb->addr_mask + 1, vaddr,
+                           !(iotlb->perm & IOMMU_WO) || mr->readonly);
+        if (ret) {
+            error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", "
+                         "0x%"HWADDR_PRIx", %p) = %d (%m)",
+                         container, iotlb->iova,
+                         iotlb->addr_mask + 1, vaddr, ret);
+        }
+    } else {
+        ret = vfio_dma_unmap(container, iotlb->iova, iotlb->addr_mask + 1);
+        if (ret) {
+            error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", "
+                         "0x%"HWADDR_PRIx") = %d (%m)",
+                         container, iotlb->iova,
+                         iotlb->addr_mask + 1, ret);
+        }
+    }
+out:
+    rcu_read_unlock();
+}
+
+static void vfio_listener_region_add(MemoryListener *listener,
+                                     MemoryRegionSection *section)
+{
+    VFIOContainer *container = container_of(listener, VFIOContainer,
+                                            iommu_data.type1.listener);
+    hwaddr iova, end;
+    Int128 llend;
+    void *vaddr;
+    int ret;
+
+    if (vfio_listener_skipped_section(section)) {
+        trace_vfio_listener_region_add_skip(
+                section->offset_within_address_space,
+                section->offset_within_address_space +
+                int128_get64(int128_sub(section->size, int128_one())));
+        return;
+    }
+
+    if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) !=
+                 (section->offset_within_region & ~TARGET_PAGE_MASK))) {
+        error_report("%s received unaligned region", __func__);
+        return;
+    }
+
+    iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
+    llend = int128_make64(section->offset_within_address_space);
+    llend = int128_add(llend, section->size);
+    llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK));
+
+    if (int128_ge(int128_make64(iova), llend)) {
+        return;
+    }
+
+    memory_region_ref(section->mr);
+
+    if (memory_region_is_iommu(section->mr)) {
+        VFIOGuestIOMMU *giommu;
+
+        trace_vfio_listener_region_add_iommu(iova,
+                    int128_get64(int128_sub(llend, int128_one())));
+        /*
+         * FIXME: We should do some checking to see if the
+         * capabilities of the host VFIO IOMMU are adequate to model
+         * the guest IOMMU
+         *
+         * FIXME: For VFIO iommu types which have KVM acceleration to
+         * avoid bouncing all map/unmaps through qemu this way, this
+         * would be the right place to wire that up (tell the KVM
+         * device emulation the VFIO iommu handles to use).
+         */
+        /*
+         * This assumes that the guest IOMMU is empty of
+         * mappings at this point.
+         *
+         * One way of doing this is:
+         * 1. Avoid sharing IOMMUs between emulated devices or different
+         * IOMMU groups.
+         * 2. Implement VFIO_IOMMU_ENABLE in the host kernel to fail if
+         * there are some mappings in IOMMU.
+         *
+         * VFIO on SPAPR does that. Other IOMMU models may do that different,
+         * they must make sure there are no existing mappings or
+         * loop through existing mappings to map them into VFIO.
+         */
+        giommu = g_malloc0(sizeof(*giommu));
+        giommu->iommu = section->mr;
+        giommu->container = container;
+        giommu->n.notify = vfio_iommu_map_notify;
+        QLIST_INSERT_HEAD(&container->giommu_list, giommu, giommu_next);
+        memory_region_register_iommu_notifier(giommu->iommu, &giommu->n);
+
+        return;
+    }
+
+    /* Here we assume that memory_region_is_ram(section->mr)==true */
+
+    end = int128_get64(llend);
+    vaddr = memory_region_get_ram_ptr(section->mr) +
+            section->offset_within_region +
+            (iova - section->offset_within_address_space);
+
+    trace_vfio_listener_region_add_ram(iova, end - 1, vaddr);
+
+    ret = vfio_dma_map(container, iova, end - iova, vaddr, section->readonly);
+    if (ret) {
+        error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", "
+                     "0x%"HWADDR_PRIx", %p) = %d (%m)",
+                     container, iova, end - iova, vaddr, ret);
+
+        /*
+         * On the initfn path, store the first error in the container so we
+         * can gracefully fail.  Runtime, there's not much we can do other
+         * than throw a hardware error.
+         */
+        if (!container->iommu_data.type1.initialized) {
+            if (!container->iommu_data.type1.error) {
+                container->iommu_data.type1.error = ret;
+            }
+        } else {
+            hw_error("vfio: DMA mapping failed, unable to continue");
+        }
+    }
+}
+
+static void vfio_listener_region_del(MemoryListener *listener,
+                                     MemoryRegionSection *section)
+{
+    VFIOContainer *container = container_of(listener, VFIOContainer,
+                                            iommu_data.type1.listener);
+    hwaddr iova, end;
+    int ret;
+
+    if (vfio_listener_skipped_section(section)) {
+        trace_vfio_listener_region_del_skip(
+                section->offset_within_address_space,
+                section->offset_within_address_space +
+                int128_get64(int128_sub(section->size, int128_one())));
+        return;
+    }
+
+    if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) !=
+                 (section->offset_within_region & ~TARGET_PAGE_MASK))) {
+        error_report("%s received unaligned region", __func__);
+        return;
+    }
+
+    if (memory_region_is_iommu(section->mr)) {
+        VFIOGuestIOMMU *giommu;
+
+        QLIST_FOREACH(giommu, &container->giommu_list, giommu_next) {
+            if (giommu->iommu == section->mr) {
+                memory_region_unregister_iommu_notifier(&giommu->n);
+                QLIST_REMOVE(giommu, giommu_next);
+                g_free(giommu);
+                break;
+            }
+        }
+
+        /*
+         * FIXME: We assume the one big unmap below is adequate to
+         * remove any individual page mappings in the IOMMU which
+         * might have been copied into VFIO. This works for a page table
+         * based IOMMU where a big unmap flattens a large range of IO-PTEs.
+         * That may not be true for all IOMMU types.
+         */
+    }
+
+    iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
+    end = (section->offset_within_address_space + int128_get64(section->size)) &
+          TARGET_PAGE_MASK;
+
+    if (iova >= end) {
+        return;
+    }
+
+    trace_vfio_listener_region_del(iova, end - 1);
+
+    ret = vfio_dma_unmap(container, iova, end - iova);
+    memory_region_unref(section->mr);
+    if (ret) {
+        error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", "
+                     "0x%"HWADDR_PRIx") = %d (%m)",
+                     container, iova, end - iova, ret);
+    }
+}
+
+static const MemoryListener vfio_memory_listener = {
+    .region_add = vfio_listener_region_add,
+    .region_del = vfio_listener_region_del,
+};
+
+static void vfio_listener_release(VFIOContainer *container)
+{
+    memory_listener_unregister(&container->iommu_data.type1.listener);
+}
+
+int vfio_mmap_region(Object *obj, VFIORegion *region,
+                     MemoryRegion *mem, MemoryRegion *submem,
+                     void **map, size_t size, off_t offset,
+                     const char *name)
+{
+    int ret = 0;
+    VFIODevice *vbasedev = region->vbasedev;
+
+    if (vbasedev->allow_mmap && size && region->flags &
+        VFIO_REGION_INFO_FLAG_MMAP) {
+        int prot = 0;
+
+        if (region->flags & VFIO_REGION_INFO_FLAG_READ) {
+            prot |= PROT_READ;
+        }
+
+        if (region->flags & VFIO_REGION_INFO_FLAG_WRITE) {
+            prot |= PROT_WRITE;
+        }
+
+        *map = mmap(NULL, size, prot, MAP_SHARED,
+                    vbasedev->fd,
+                    region->fd_offset + offset);
+        if (*map == MAP_FAILED) {
+            *map = NULL;
+            ret = -errno;
+            goto empty_region;
+        }
+
+        memory_region_init_ram_ptr(submem, obj, name, size, *map);
+        memory_region_set_skip_dump(submem);
+    } else {
+empty_region:
+        /* Create a zero sized sub-region to make cleanup easy. */
+        memory_region_init(submem, obj, name, 0);
+    }
+
+    memory_region_add_subregion(mem, offset, submem);
+
+    return ret;
+}
+
+void vfio_reset_handler(void *opaque)
+{
+    VFIOGroup *group;
+    VFIODevice *vbasedev;
+
+    QLIST_FOREACH(group, &vfio_group_list, next) {
+        QLIST_FOREACH(vbasedev, &group->device_list, next) {
+            vbasedev->ops->vfio_compute_needs_reset(vbasedev);
+        }
+    }
+
+    QLIST_FOREACH(group, &vfio_group_list, next) {
+        QLIST_FOREACH(vbasedev, &group->device_list, next) {
+            if (vbasedev->needs_reset) {
+                vbasedev->ops->vfio_hot_reset_multi(vbasedev);
+            }
+        }
+    }
+}
+
+static void vfio_kvm_device_add_group(VFIOGroup *group)
+{
+#ifdef CONFIG_KVM
+    struct kvm_device_attr attr = {
+        .group = KVM_DEV_VFIO_GROUP,
+        .attr = KVM_DEV_VFIO_GROUP_ADD,
+        .addr = (uint64_t)(unsigned long)&group->fd,
+    };
+
+    if (!kvm_enabled()) {
+        return;
+    }
+
+    if (vfio_kvm_device_fd < 0) {
+        struct kvm_create_device cd = {
+            .type = KVM_DEV_TYPE_VFIO,
+        };
+
+        if (kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &cd)) {
+            error_report("Failed to create KVM VFIO device: %m");
+            return;
+        }
+
+        vfio_kvm_device_fd = cd.fd;
+    }
+
+    if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
+        error_report("Failed to add group %d to KVM VFIO device: %m",
+                     group->groupid);
+    }
+#endif
+}
+
+static void vfio_kvm_device_del_group(VFIOGroup *group)
+{
+#ifdef CONFIG_KVM
+    struct kvm_device_attr attr = {
+        .group = KVM_DEV_VFIO_GROUP,
+        .attr = KVM_DEV_VFIO_GROUP_DEL,
+        .addr = (uint64_t)(unsigned long)&group->fd,
+    };
+
+    if (vfio_kvm_device_fd < 0) {
+        return;
+    }
+
+    if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
+        error_report("Failed to remove group %d from KVM VFIO device: %m",
+                     group->groupid);
+    }
+#endif
+}
+
+static VFIOAddressSpace *vfio_get_address_space(AddressSpace *as)
+{
+    VFIOAddressSpace *space;
+
+    QLIST_FOREACH(space, &vfio_address_spaces, list) {
+        if (space->as == as) {
+            return space;
+        }
+    }
+
+    /* No suitable VFIOAddressSpace, create a new one */
+    space = g_malloc0(sizeof(*space));
+    space->as = as;
+    QLIST_INIT(&space->containers);
+
+    QLIST_INSERT_HEAD(&vfio_address_spaces, space, list);
+
+    return space;
+}
+
+static void vfio_put_address_space(VFIOAddressSpace *space)
+{
+    if (QLIST_EMPTY(&space->containers)) {
+        QLIST_REMOVE(space, list);
+        g_free(space);
+    }
+}
+
+static int vfio_connect_container(VFIOGroup *group, AddressSpace *as)
+{
+    VFIOContainer *container;
+    int ret, fd;
+    VFIOAddressSpace *space;
+
+    space = vfio_get_address_space(as);
+
+    QLIST_FOREACH(container, &space->containers, next) {
+        if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) {
+            group->container = container;
+            QLIST_INSERT_HEAD(&container->group_list, group, container_next);
+            return 0;
+        }
+    }
+
+    fd = qemu_open("/dev/vfio/vfio", O_RDWR);
+    if (fd < 0) {
+        error_report("vfio: failed to open /dev/vfio/vfio: %m");
+        ret = -errno;
+        goto put_space_exit;
+    }
+
+    ret = ioctl(fd, VFIO_GET_API_VERSION);
+    if (ret != VFIO_API_VERSION) {
+        error_report("vfio: supported vfio version: %d, "
+                     "reported version: %d", VFIO_API_VERSION, ret);
+        ret = -EINVAL;
+        goto close_fd_exit;
+    }
+
+    container = g_malloc0(sizeof(*container));
+    container->space = space;
+    container->fd = fd;
+    if (ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1_IOMMU) ||
+        ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1v2_IOMMU)) {
+        bool v2 = !!ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1v2_IOMMU);
+
+        ret = ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &fd);
+        if (ret) {
+            error_report("vfio: failed to set group container: %m");
+            ret = -errno;
+            goto free_container_exit;
+        }
+
+        ret = ioctl(fd, VFIO_SET_IOMMU,
+                    v2 ? VFIO_TYPE1v2_IOMMU : VFIO_TYPE1_IOMMU);
+        if (ret) {
+            error_report("vfio: failed to set iommu for container: %m");
+            ret = -errno;
+            goto free_container_exit;
+        }
+
+        container->iommu_data.type1.listener = vfio_memory_listener;
+        container->iommu_data.release = vfio_listener_release;
+
+        memory_listener_register(&container->iommu_data.type1.listener,
+                                 container->space->as);
+
+        if (container->iommu_data.type1.error) {
+            ret = container->iommu_data.type1.error;
+            error_report("vfio: memory listener initialization failed for container");
+            goto listener_release_exit;
+        }
+
+        container->iommu_data.type1.initialized = true;
+
+    } else if (ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_SPAPR_TCE_IOMMU)) {
+        ret = ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &fd);
+        if (ret) {
+            error_report("vfio: failed to set group container: %m");
+            ret = -errno;
+            goto free_container_exit;
+        }
+        ret = ioctl(fd, VFIO_SET_IOMMU, VFIO_SPAPR_TCE_IOMMU);
+        if (ret) {
+            error_report("vfio: failed to set iommu for container: %m");
+            ret = -errno;
+            goto free_container_exit;
+        }
+
+        /*
+         * The host kernel code implementing VFIO_IOMMU_DISABLE is called
+         * when container fd is closed so we do not call it explicitly
+         * in this file.
+         */
+        ret = ioctl(fd, VFIO_IOMMU_ENABLE);
+        if (ret) {
+            error_report("vfio: failed to enable container: %m");
+            ret = -errno;
+            goto free_container_exit;
+        }
+
+        container->iommu_data.type1.listener = vfio_memory_listener;
+        container->iommu_data.release = vfio_listener_release;
+
+        memory_listener_register(&container->iommu_data.type1.listener,
+                                 container->space->as);
+
+    } else {
+        error_report("vfio: No available IOMMU models");
+        ret = -EINVAL;
+        goto free_container_exit;
+    }
+
+    QLIST_INIT(&container->group_list);
+    QLIST_INSERT_HEAD(&space->containers, container, next);
+
+    group->container = container;
+    QLIST_INSERT_HEAD(&container->group_list, group, container_next);
+
+    return 0;
+listener_release_exit:
+    vfio_listener_release(container);
+
+free_container_exit:
+    g_free(container);
+
+close_fd_exit:
+    close(fd);
+
+put_space_exit:
+    vfio_put_address_space(space);
+
+    return ret;
+}
+
+static void vfio_disconnect_container(VFIOGroup *group)
+{
+    VFIOContainer *container = group->container;
+
+    if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) {
+        error_report("vfio: error disconnecting group %d from container",
+                     group->groupid);
+    }
+
+    QLIST_REMOVE(group, container_next);
+    group->container = NULL;
+
+    if (QLIST_EMPTY(&container->group_list)) {
+        VFIOAddressSpace *space = container->space;
+        VFIOGuestIOMMU *giommu, *tmp;
+
+        if (container->iommu_data.release) {
+            container->iommu_data.release(container);
+        }
+        QLIST_REMOVE(container, next);
+
+        QLIST_FOREACH_SAFE(giommu, &container->giommu_list, giommu_next, tmp) {
+            memory_region_unregister_iommu_notifier(&giommu->n);
+            QLIST_REMOVE(giommu, giommu_next);
+            g_free(giommu);
+        }
+
+        trace_vfio_disconnect_container(container->fd);
+        close(container->fd);
+        g_free(container);
+
+        vfio_put_address_space(space);
+    }
+}
+
+VFIOGroup *vfio_get_group(int groupid, AddressSpace *as)
+{
+    VFIOGroup *group;
+    char path[32];
+    struct vfio_group_status status = { .argsz = sizeof(status) };
+
+    QLIST_FOREACH(group, &vfio_group_list, next) {
+        if (group->groupid == groupid) {
+            /* Found it.  Now is it already in the right context? */
+            if (group->container->space->as == as) {
+                return group;
+            } else {
+                error_report("vfio: group %d used in multiple address spaces",
+                             group->groupid);
+                return NULL;
+            }
+        }
+    }
+
+    group = g_malloc0(sizeof(*group));
+
+    snprintf(path, sizeof(path), "/dev/vfio/%d", groupid);
+    group->fd = qemu_open(path, O_RDWR);
+    if (group->fd < 0) {
+        error_report("vfio: error opening %s: %m", path);
+        goto free_group_exit;
+    }
+
+    if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) {
+        error_report("vfio: error getting group status: %m");
+        goto close_fd_exit;
+    }
+
+    if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) {
+        error_report("vfio: error, group %d is not viable, please ensure "
+                     "all devices within the iommu_group are bound to their "
+                     "vfio bus driver.", groupid);
+        goto close_fd_exit;
+    }
+
+    group->groupid = groupid;
+    QLIST_INIT(&group->device_list);
+
+    if (vfio_connect_container(group, as)) {
+        error_report("vfio: failed to setup container for group %d", groupid);
+        goto close_fd_exit;
+    }
+
+    if (QLIST_EMPTY(&vfio_group_list)) {
+        qemu_register_reset(vfio_reset_handler, NULL);
+    }
+
+    QLIST_INSERT_HEAD(&vfio_group_list, group, next);
+
+    vfio_kvm_device_add_group(group);
+
+    return group;
+
+close_fd_exit:
+    close(group->fd);
+
+free_group_exit:
+    g_free(group);
+
+    return NULL;
+}
+
+void vfio_put_group(VFIOGroup *group)
+{
+    if (!group || !QLIST_EMPTY(&group->device_list)) {
+        return;
+    }
+
+    vfio_kvm_device_del_group(group);
+    vfio_disconnect_container(group);
+    QLIST_REMOVE(group, next);
+    trace_vfio_put_group(group->fd);
+    close(group->fd);
+    g_free(group);
+
+    if (QLIST_EMPTY(&vfio_group_list)) {
+        qemu_unregister_reset(vfio_reset_handler, NULL);
+    }
+}
+
+int vfio_get_device(VFIOGroup *group, const char *name,
+                       VFIODevice *vbasedev)
+{
+    struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) };
+    int ret, fd;
+
+    fd = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name);
+    if (fd < 0) {
+        error_report("vfio: error getting device %s from group %d: %m",
+                     name, group->groupid);
+        error_printf("Verify all devices in group %d are bound to vfio-<bus> "
+                     "or pci-stub and not already in use\n", group->groupid);
+        return fd;
+    }
+
+    ret = ioctl(fd, VFIO_DEVICE_GET_INFO, &dev_info);
+    if (ret) {
+        error_report("vfio: error getting device info: %m");
+        close(fd);
+        return ret;
+    }
+
+    vbasedev->fd = fd;
+    vbasedev->group = group;
+    QLIST_INSERT_HEAD(&group->device_list, vbasedev, next);
+
+    vbasedev->num_irqs = dev_info.num_irqs;
+    vbasedev->num_regions = dev_info.num_regions;
+    vbasedev->flags = dev_info.flags;
+
+    trace_vfio_get_device(name, dev_info.flags, dev_info.num_regions,
+                          dev_info.num_irqs);
+
+    vbasedev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET);
+    return 0;
+}
+
+void vfio_put_base_device(VFIODevice *vbasedev)
+{
+    if (!vbasedev->group) {
+        return;
+    }
+    QLIST_REMOVE(vbasedev, next);
+    vbasedev->group = NULL;
+    trace_vfio_put_base_device(vbasedev->fd);
+    close(vbasedev->fd);
+}
+
+static int vfio_container_do_ioctl(AddressSpace *as, int32_t groupid,
+                                   int req, void *param)
+{
+    VFIOGroup *group;
+    VFIOContainer *container;
+    int ret = -1;
+
+    group = vfio_get_group(groupid, as);
+    if (!group) {
+        error_report("vfio: group %d not registered", groupid);
+        return ret;
+    }
+
+    container = group->container;
+    if (group->container) {
+        ret = ioctl(container->fd, req, param);
+        if (ret < 0) {
+            error_report("vfio: failed to ioctl %d to container: ret=%d, %s",
+                         _IOC_NR(req) - VFIO_BASE, ret, strerror(errno));
+        }
+    }
+
+    vfio_put_group(group);
+
+    return ret;
+}
+
+int vfio_container_ioctl(AddressSpace *as, int32_t groupid,
+                         int req, void *param)
+{
+    /* We allow only certain ioctls to the container */
+    switch (req) {
+    case VFIO_CHECK_EXTENSION:
+    case VFIO_IOMMU_SPAPR_TCE_GET_INFO:
+    case VFIO_EEH_PE_OP:
+        break;
+    default:
+        /* Return an error on unknown requests */
+        error_report("vfio: unsupported ioctl %X", req);
+        return -1;
+    }
+
+    return vfio_container_do_ioctl(as, groupid, req, param);
+}
diff --git a/qemu/hw/vfio/pci.c b/qemu/hw/vfio/pci.c
new file mode 100644
index 000000000..4023d8e82
--- /dev/null
+++ b/qemu/hw/vfio/pci.c
@@ -0,0 +1,3797 @@
+/*
+ * vfio based device assignment support
+ *
+ * Copyright Red Hat, Inc. 2012
+ *
+ * Authors:
+ *  Alex Williamson <alex.williamson@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ * Based on qemu-kvm device-assignment:
+ *  Adapted for KVM by Qumranet.
+ *  Copyright (c) 2007, Neocleus, Alex Novik (alex@neocleus.com)
+ *  Copyright (c) 2007, Neocleus, Guy Zana (guy@neocleus.com)
+ *  Copyright (C) 2008, Qumranet, Amit Shah (amit.shah@qumranet.com)
+ *  Copyright (C) 2008, Red Hat, Amit Shah (amit.shah@redhat.com)
+ *  Copyright (C) 2008, IBM, Muli Ben-Yehuda (muli@il.ibm.com)
+ */
+
+#include <dirent.h>
+#include <linux/vfio.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "config.h"
+#include "exec/address-spaces.h"
+#include "exec/memory.h"
+#include "hw/pci/msi.h"
+#include "hw/pci/msix.h"
+#include "hw/pci/pci.h"
+#include "qemu-common.h"
+#include "qemu/error-report.h"
+#include "qemu/event_notifier.h"
+#include "qemu/queue.h"
+#include "qemu/range.h"
+#include "sysemu/kvm.h"
+#include "sysemu/sysemu.h"
+#include "trace.h"
+#include "hw/vfio/vfio.h"
+#include "hw/vfio/vfio-common.h"
+
+struct VFIOPCIDevice;
+
+typedef struct VFIOQuirk {
+    MemoryRegion mem;
+    struct VFIOPCIDevice *vdev;
+    QLIST_ENTRY(VFIOQuirk) next;
+    struct {
+        uint32_t base_offset:TARGET_PAGE_BITS;
+        uint32_t address_offset:TARGET_PAGE_BITS;
+        uint32_t address_size:3;
+        uint32_t bar:3;
+
+        uint32_t address_match;
+        uint32_t address_mask;
+
+        uint32_t address_val:TARGET_PAGE_BITS;
+        uint32_t data_offset:TARGET_PAGE_BITS;
+        uint32_t data_size:3;
+
+        uint8_t flags;
+        uint8_t read_flags;
+        uint8_t write_flags;
+    } data;
+} VFIOQuirk;
+
+typedef struct VFIOBAR {
+    VFIORegion region;
+    bool ioport;
+    bool mem64;
+    QLIST_HEAD(, VFIOQuirk) quirks;
+} VFIOBAR;
+
+typedef struct VFIOVGARegion {
+    MemoryRegion mem;
+    off_t offset;
+    int nr;
+    QLIST_HEAD(, VFIOQuirk) quirks;
+} VFIOVGARegion;
+
+typedef struct VFIOVGA {
+    off_t fd_offset;
+    int fd;
+    VFIOVGARegion region[QEMU_PCI_VGA_NUM_REGIONS];
+} VFIOVGA;
+
+typedef struct VFIOINTx {
+    bool pending; /* interrupt pending */
+    bool kvm_accel; /* set when QEMU bypass through KVM enabled */
+    uint8_t pin; /* which pin to pull for qemu_set_irq */
+    EventNotifier interrupt; /* eventfd triggered on interrupt */
+    EventNotifier unmask; /* eventfd for unmask on QEMU bypass */
+    PCIINTxRoute route; /* routing info for QEMU bypass */
+    uint32_t mmap_timeout; /* delay to re-enable mmaps after interrupt */
+    QEMUTimer *mmap_timer; /* enable mmaps after periods w/o interrupts */
+} VFIOINTx;
+
+typedef struct VFIOMSIVector {
+    /*
+     * Two interrupt paths are configured per vector.  The first, is only used
+     * for interrupts injected via QEMU.  This is typically the non-accel path,
+     * but may also be used when we want QEMU to handle masking and pending
+     * bits.  The KVM path bypasses QEMU and is therefore higher performance,
+     * but requires masking at the device.  virq is used to track the MSI route
+     * through KVM, thus kvm_interrupt is only available when virq is set to a
+     * valid (>= 0) value.
+     */
+    EventNotifier interrupt;
+    EventNotifier kvm_interrupt;
+    struct VFIOPCIDevice *vdev; /* back pointer to device */
+    int virq;
+    bool use;
+} VFIOMSIVector;
+
+enum {
+    VFIO_INT_NONE = 0,
+    VFIO_INT_INTx = 1,
+    VFIO_INT_MSI  = 2,
+    VFIO_INT_MSIX = 3,
+};
+
+/* Cache of MSI-X setup plus extra mmap and memory region for split BAR map */
+typedef struct VFIOMSIXInfo {
+    uint8_t table_bar;
+    uint8_t pba_bar;
+    uint16_t entries;
+    uint32_t table_offset;
+    uint32_t pba_offset;
+    MemoryRegion mmap_mem;
+    void *mmap;
+} VFIOMSIXInfo;
+
+typedef struct VFIOPCIDevice {
+    PCIDevice pdev;
+    VFIODevice vbasedev;
+    VFIOINTx intx;
+    unsigned int config_size;
+    uint8_t *emulated_config_bits; /* QEMU emulated bits, little-endian */
+    off_t config_offset; /* Offset of config space region within device fd */
+    unsigned int rom_size;
+    off_t rom_offset; /* Offset of ROM region within device fd */
+    void *rom;
+    int msi_cap_size;
+    VFIOMSIVector *msi_vectors;
+    VFIOMSIXInfo *msix;
+    int nr_vectors; /* Number of MSI/MSIX vectors currently in use */
+    int interrupt; /* Current interrupt type */
+    VFIOBAR bars[PCI_NUM_REGIONS - 1]; /* No ROM */
+    VFIOVGA vga; /* 0xa0000, 0x3b0, 0x3c0 */
+    PCIHostDeviceAddress host;
+    EventNotifier err_notifier;
+    EventNotifier req_notifier;
+    int (*resetfn)(struct VFIOPCIDevice *);
+    uint32_t features;
+#define VFIO_FEATURE_ENABLE_VGA_BIT 0
+#define VFIO_FEATURE_ENABLE_VGA (1 << VFIO_FEATURE_ENABLE_VGA_BIT)
+#define VFIO_FEATURE_ENABLE_REQ_BIT 1
+#define VFIO_FEATURE_ENABLE_REQ (1 << VFIO_FEATURE_ENABLE_REQ_BIT)
+    int32_t bootindex;
+    uint8_t pm_cap;
+    bool has_vga;
+    bool pci_aer;
+    bool req_enabled;
+    bool has_flr;
+    bool has_pm_reset;
+    bool rom_read_failed;
+} VFIOPCIDevice;
+
+typedef struct VFIORomBlacklistEntry {
+    uint16_t vendor_id;
+    uint16_t device_id;
+} VFIORomBlacklistEntry;
+
+/*
+ * List of device ids/vendor ids for which to disable
+ * option rom loading. This avoids the guest hangs during rom
+ * execution as noticed with the BCM 57810 card for lack of a
+ * more better way to handle such issues.
+ * The  user can still override by specifying a romfile or
+ * rombar=1.
+ * Please see https://bugs.launchpad.net/qemu/+bug/1284874
+ * for an analysis of the 57810 card hang. When adding
+ * a new vendor id/device id combination below, please also add
+ * your card/environment details and information that could
+ * help in debugging to the bug tracking this issue
+ */
+static const VFIORomBlacklistEntry romblacklist[] = {
+    /* Broadcom BCM 57810 */
+    { 0x14e4, 0x168e }
+};
+
+#define MSIX_CAP_LENGTH 12
+
+static void vfio_disable_interrupts(VFIOPCIDevice *vdev);
+static uint32_t vfio_pci_read_config(PCIDevice *pdev, uint32_t addr, int len);
+static void vfio_pci_write_config(PCIDevice *pdev, uint32_t addr,
+                                  uint32_t val, int len);
+static void vfio_mmap_set_enabled(VFIOPCIDevice *vdev, bool enabled);
+
+/*
+ * Disabling BAR mmaping can be slow, but toggling it around INTx can
+ * also be a huge overhead.  We try to get the best of both worlds by
+ * waiting until an interrupt to disable mmaps (subsequent transitions
+ * to the same state are effectively no overhead).  If the interrupt has
+ * been serviced and the time gap is long enough, we re-enable mmaps for
+ * performance.  This works well for things like graphics cards, which
+ * may not use their interrupt at all and are penalized to an unusable
+ * level by read/write BAR traps.  Other devices, like NICs, have more
+ * regular interrupts and see much better latency by staying in non-mmap
+ * mode.  We therefore set the default mmap_timeout such that a ping
+ * is just enough to keep the mmap disabled.  Users can experiment with
+ * other options with the x-intx-mmap-timeout-ms parameter (a value of
+ * zero disables the timer).
+ */
+static void vfio_intx_mmap_enable(void *opaque)
+{
+    VFIOPCIDevice *vdev = opaque;
+
+    if (vdev->intx.pending) {
+        timer_mod(vdev->intx.mmap_timer,
+                       qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + vdev->intx.mmap_timeout);
+        return;
+    }
+
+    vfio_mmap_set_enabled(vdev, true);
+}
+
+static void vfio_intx_interrupt(void *opaque)
+{
+    VFIOPCIDevice *vdev = opaque;
+
+    if (!event_notifier_test_and_clear(&vdev->intx.interrupt)) {
+        return;
+    }
+
+    trace_vfio_intx_interrupt(vdev->vbasedev.name, 'A' + vdev->intx.pin);
+
+    vdev->intx.pending = true;
+    pci_irq_assert(&vdev->pdev);
+    vfio_mmap_set_enabled(vdev, false);
+    if (vdev->intx.mmap_timeout) {
+        timer_mod(vdev->intx.mmap_timer,
+                       qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + vdev->intx.mmap_timeout);
+    }
+}
+
+static void vfio_eoi(VFIODevice *vbasedev)
+{
+    VFIOPCIDevice *vdev = container_of(vbasedev, VFIOPCIDevice, vbasedev);
+
+    if (!vdev->intx.pending) {
+        return;
+    }
+
+    trace_vfio_eoi(vbasedev->name);
+
+    vdev->intx.pending = false;
+    pci_irq_deassert(&vdev->pdev);
+    vfio_unmask_single_irqindex(vbasedev, VFIO_PCI_INTX_IRQ_INDEX);
+}
+
+static void vfio_enable_intx_kvm(VFIOPCIDevice *vdev)
+{
+#ifdef CONFIG_KVM
+    struct kvm_irqfd irqfd = {
+        .fd = event_notifier_get_fd(&vdev->intx.interrupt),
+        .gsi = vdev->intx.route.irq,
+        .flags = KVM_IRQFD_FLAG_RESAMPLE,
+    };
+    struct vfio_irq_set *irq_set;
+    int ret, argsz;
+    int32_t *pfd;
+
+    if (!VFIO_ALLOW_KVM_INTX || !kvm_irqfds_enabled() ||
+        vdev->intx.route.mode != PCI_INTX_ENABLED ||
+        !kvm_resamplefds_enabled()) {
+        return;
+    }
+
+    /* Get to a known interrupt state */
+    qemu_set_fd_handler(irqfd.fd, NULL, NULL, vdev);
+    vfio_mask_single_irqindex(&vdev->vbasedev, VFIO_PCI_INTX_IRQ_INDEX);
+    vdev->intx.pending = false;
+    pci_irq_deassert(&vdev->pdev);
+
+    /* Get an eventfd for resample/unmask */
+    if (event_notifier_init(&vdev->intx.unmask, 0)) {
+        error_report("vfio: Error: event_notifier_init failed eoi");
+        goto fail;
+    }
+
+    /* KVM triggers it, VFIO listens for it */
+    irqfd.resamplefd = event_notifier_get_fd(&vdev->intx.unmask);
+
+    if (kvm_vm_ioctl(kvm_state, KVM_IRQFD, &irqfd)) {
+        error_report("vfio: Error: Failed to setup resample irqfd: %m");
+        goto fail_irqfd;
+    }
+
+    argsz = sizeof(*irq_set) + sizeof(*pfd);
+
+    irq_set = g_malloc0(argsz);
+    irq_set->argsz = argsz;
+    irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_UNMASK;
+    irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
+    irq_set->start = 0;
+    irq_set->count = 1;
+    pfd = (int32_t *)&irq_set->data;
+
+    *pfd = irqfd.resamplefd;
+
+    ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_SET_IRQS, irq_set);
+    g_free(irq_set);
+    if (ret) {
+        error_report("vfio: Error: Failed to setup INTx unmask fd: %m");
+        goto fail_vfio;
+    }
+
+    /* Let'em rip */
+    vfio_unmask_single_irqindex(&vdev->vbasedev, VFIO_PCI_INTX_IRQ_INDEX);
+
+    vdev->intx.kvm_accel = true;
+
+    trace_vfio_enable_intx_kvm(vdev->vbasedev.name);
+
+    return;
+
+fail_vfio:
+    irqfd.flags = KVM_IRQFD_FLAG_DEASSIGN;
+    kvm_vm_ioctl(kvm_state, KVM_IRQFD, &irqfd);
+fail_irqfd:
+    event_notifier_cleanup(&vdev->intx.unmask);
+fail:
+    qemu_set_fd_handler(irqfd.fd, vfio_intx_interrupt, NULL, vdev);
+    vfio_unmask_single_irqindex(&vdev->vbasedev, VFIO_PCI_INTX_IRQ_INDEX);
+#endif
+}
+
+static void vfio_disable_intx_kvm(VFIOPCIDevice *vdev)
+{
+#ifdef CONFIG_KVM
+    struct kvm_irqfd irqfd = {
+        .fd = event_notifier_get_fd(&vdev->intx.interrupt),
+        .gsi = vdev->intx.route.irq,
+        .flags = KVM_IRQFD_FLAG_DEASSIGN,
+    };
+
+    if (!vdev->intx.kvm_accel) {
+        return;
+    }
+
+    /*
+     * Get to a known state, hardware masked, QEMU ready to accept new
+     * interrupts, QEMU IRQ de-asserted.
+     */
+    vfio_mask_single_irqindex(&vdev->vbasedev, VFIO_PCI_INTX_IRQ_INDEX);
+    vdev->intx.pending = false;
+    pci_irq_deassert(&vdev->pdev);
+
+    /* Tell KVM to stop listening for an INTx irqfd */
+    if (kvm_vm_ioctl(kvm_state, KVM_IRQFD, &irqfd)) {
+        error_report("vfio: Error: Failed to disable INTx irqfd: %m");
+    }
+
+    /* We only need to close the eventfd for VFIO to cleanup the kernel side */
+    event_notifier_cleanup(&vdev->intx.unmask);
+
+    /* QEMU starts listening for interrupt events. */
+    qemu_set_fd_handler(irqfd.fd, vfio_intx_interrupt, NULL, vdev);
+
+    vdev->intx.kvm_accel = false;
+
+    /* If we've missed an event, let it re-fire through QEMU */
+    vfio_unmask_single_irqindex(&vdev->vbasedev, VFIO_PCI_INTX_IRQ_INDEX);
+
+    trace_vfio_disable_intx_kvm(vdev->vbasedev.name);
+#endif
+}
+
+static void vfio_update_irq(PCIDevice *pdev)
+{
+    VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev);
+    PCIINTxRoute route;
+
+    if (vdev->interrupt != VFIO_INT_INTx) {
+        return;
+    }
+
+    route = pci_device_route_intx_to_irq(&vdev->pdev, vdev->intx.pin);
+
+    if (!pci_intx_route_changed(&vdev->intx.route, &route)) {
+        return; /* Nothing changed */
+    }
+
+    trace_vfio_update_irq(vdev->vbasedev.name,
+                          vdev->intx.route.irq, route.irq);
+
+    vfio_disable_intx_kvm(vdev);
+
+    vdev->intx.route = route;
+
+    if (route.mode != PCI_INTX_ENABLED) {
+        return;
+    }
+
+    vfio_enable_intx_kvm(vdev);
+
+    /* Re-enable the interrupt in cased we missed an EOI */
+    vfio_eoi(&vdev->vbasedev);
+}
+
+static int vfio_enable_intx(VFIOPCIDevice *vdev)
+{
+    uint8_t pin = vfio_pci_read_config(&vdev->pdev, PCI_INTERRUPT_PIN, 1);
+    int ret, argsz;
+    struct vfio_irq_set *irq_set;
+    int32_t *pfd;
+
+    if (!pin) {
+        return 0;
+    }
+
+    vfio_disable_interrupts(vdev);
+
+    vdev->intx.pin = pin - 1; /* Pin A (1) -> irq[0] */
+    pci_config_set_interrupt_pin(vdev->pdev.config, pin);
+
+#ifdef CONFIG_KVM
+    /*
+     * Only conditional to avoid generating error messages on platforms
+     * where we won't actually use the result anyway.
+     */
+    if (kvm_irqfds_enabled() && kvm_resamplefds_enabled()) {
+        vdev->intx.route = pci_device_route_intx_to_irq(&vdev->pdev,
+                                                        vdev->intx.pin);
+    }
+#endif
+
+    ret = event_notifier_init(&vdev->intx.interrupt, 0);
+    if (ret) {
+        error_report("vfio: Error: event_notifier_init failed");
+        return ret;
+    }
+
+    argsz = sizeof(*irq_set) + sizeof(*pfd);
+
+    irq_set = g_malloc0(argsz);
+    irq_set->argsz = argsz;
+    irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
+    irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
+    irq_set->start = 0;
+    irq_set->count = 1;
+    pfd = (int32_t *)&irq_set->data;
+
+    *pfd = event_notifier_get_fd(&vdev->intx.interrupt);
+    qemu_set_fd_handler(*pfd, vfio_intx_interrupt, NULL, vdev);
+
+    ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_SET_IRQS, irq_set);
+    g_free(irq_set);
+    if (ret) {
+        error_report("vfio: Error: Failed to setup INTx fd: %m");
+        qemu_set_fd_handler(*pfd, NULL, NULL, vdev);
+        event_notifier_cleanup(&vdev->intx.interrupt);
+        return -errno;
+    }
+
+    vfio_enable_intx_kvm(vdev);
+
+    vdev->interrupt = VFIO_INT_INTx;
+
+    trace_vfio_enable_intx(vdev->vbasedev.name);
+
+    return 0;
+}
+
+static void vfio_disable_intx(VFIOPCIDevice *vdev)
+{
+    int fd;
+
+    timer_del(vdev->intx.mmap_timer);
+    vfio_disable_intx_kvm(vdev);
+    vfio_disable_irqindex(&vdev->vbasedev, VFIO_PCI_INTX_IRQ_INDEX);
+    vdev->intx.pending = false;
+    pci_irq_deassert(&vdev->pdev);
+    vfio_mmap_set_enabled(vdev, true);
+
+    fd = event_notifier_get_fd(&vdev->intx.interrupt);
+    qemu_set_fd_handler(fd, NULL, NULL, vdev);
+    event_notifier_cleanup(&vdev->intx.interrupt);
+
+    vdev->interrupt = VFIO_INT_NONE;
+
+    trace_vfio_disable_intx(vdev->vbasedev.name);
+}
+
+/*
+ * MSI/X
+ */
+static void vfio_msi_interrupt(void *opaque)
+{
+    VFIOMSIVector *vector = opaque;
+    VFIOPCIDevice *vdev = vector->vdev;
+    int nr = vector - vdev->msi_vectors;
+
+    if (!event_notifier_test_and_clear(&vector->interrupt)) {
+        return;
+    }
+
+#ifdef DEBUG_VFIO
+    MSIMessage msg;
+
+    if (vdev->interrupt == VFIO_INT_MSIX) {
+        msg = msix_get_message(&vdev->pdev, nr);
+    } else if (vdev->interrupt == VFIO_INT_MSI) {
+        msg = msi_get_message(&vdev->pdev, nr);
+    } else {
+        abort();
+    }
+
+    trace_vfio_msi_interrupt(vdev->vbasedev.name, nr, msg.address, msg.data);
+#endif
+
+    if (vdev->interrupt == VFIO_INT_MSIX) {
+        msix_notify(&vdev->pdev, nr);
+    } else if (vdev->interrupt == VFIO_INT_MSI) {
+        msi_notify(&vdev->pdev, nr);
+    } else {
+        error_report("vfio: MSI interrupt receieved, but not enabled?");
+    }
+}
+
+static int vfio_enable_vectors(VFIOPCIDevice *vdev, bool msix)
+{
+    struct vfio_irq_set *irq_set;
+    int ret = 0, i, argsz;
+    int32_t *fds;
+
+    argsz = sizeof(*irq_set) + (vdev->nr_vectors * sizeof(*fds));
+
+    irq_set = g_malloc0(argsz);
+    irq_set->argsz = argsz;
+    irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
+    irq_set->index = msix ? VFIO_PCI_MSIX_IRQ_INDEX : VFIO_PCI_MSI_IRQ_INDEX;
+    irq_set->start = 0;
+    irq_set->count = vdev->nr_vectors;
+    fds = (int32_t *)&irq_set->data;
+
+    for (i = 0; i < vdev->nr_vectors; i++) {
+        int fd = -1;
+
+        /*
+         * MSI vs MSI-X - The guest has direct access to MSI mask and pending
+         * bits, therefore we always use the KVM signaling path when setup.
+         * MSI-X mask and pending bits are emulated, so we want to use the
+         * KVM signaling path only when configured and unmasked.
+         */
+        if (vdev->msi_vectors[i].use) {
+            if (vdev->msi_vectors[i].virq < 0 ||
+                (msix && msix_is_masked(&vdev->pdev, i))) {
+                fd = event_notifier_get_fd(&vdev->msi_vectors[i].interrupt);
+            } else {
+                fd = event_notifier_get_fd(&vdev->msi_vectors[i].kvm_interrupt);
+            }
+        }
+
+        fds[i] = fd;
+    }
+
+    ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_SET_IRQS, irq_set);
+
+    g_free(irq_set);
+
+    return ret;
+}
+
+static void vfio_add_kvm_msi_virq(VFIOMSIVector *vector, MSIMessage *msg,
+                                  bool msix)
+{
+    int virq;
+
+    if ((msix && !VFIO_ALLOW_KVM_MSIX) ||
+        (!msix && !VFIO_ALLOW_KVM_MSI) || !msg) {
+        return;
+    }
+
+    if (event_notifier_init(&vector->kvm_interrupt, 0)) {
+        return;
+    }
+
+    virq = kvm_irqchip_add_msi_route(kvm_state, *msg);
+    if (virq < 0) {
+        event_notifier_cleanup(&vector->kvm_interrupt);
+        return;
+    }
+
+    if (kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, &vector->kvm_interrupt,
+                                       NULL, virq) < 0) {
+        kvm_irqchip_release_virq(kvm_state, virq);
+        event_notifier_cleanup(&vector->kvm_interrupt);
+        return;
+    }
+
+    vector->virq = virq;
+}
+
+static void vfio_remove_kvm_msi_virq(VFIOMSIVector *vector)
+{
+    kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, &vector->kvm_interrupt,
+                                          vector->virq);
+    kvm_irqchip_release_virq(kvm_state, vector->virq);
+    vector->virq = -1;
+    event_notifier_cleanup(&vector->kvm_interrupt);
+}
+
+static void vfio_update_kvm_msi_virq(VFIOMSIVector *vector, MSIMessage msg)
+{
+    kvm_irqchip_update_msi_route(kvm_state, vector->virq, msg);
+}
+
+static int vfio_msix_vector_do_use(PCIDevice *pdev, unsigned int nr,
+                                   MSIMessage *msg, IOHandler *handler)
+{
+    VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev);
+    VFIOMSIVector *vector;
+    int ret;
+
+    trace_vfio_msix_vector_do_use(vdev->vbasedev.name, nr);
+
+    vector = &vdev->msi_vectors[nr];
+
+    if (!vector->use) {
+        vector->vdev = vdev;
+        vector->virq = -1;
+        if (event_notifier_init(&vector->interrupt, 0)) {
+            error_report("vfio: Error: event_notifier_init failed");
+        }
+        vector->use = true;
+        msix_vector_use(pdev, nr);
+    }
+
+    qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt),
+                        handler, NULL, vector);
+
+    /*
+     * Attempt to enable route through KVM irqchip,
+     * default to userspace handling if unavailable.
+     */
+    if (vector->virq >= 0) {
+        if (!msg) {
+            vfio_remove_kvm_msi_virq(vector);
+        } else {
+            vfio_update_kvm_msi_virq(vector, *msg);
+        }
+    } else {
+        vfio_add_kvm_msi_virq(vector, msg, true);
+    }
+
+    /*
+     * We don't want to have the host allocate all possible MSI vectors
+     * for a device if they're not in use, so we shutdown and incrementally
+     * increase them as needed.
+     */
+    if (vdev->nr_vectors < nr + 1) {
+        vfio_disable_irqindex(&vdev->vbasedev, VFIO_PCI_MSIX_IRQ_INDEX);
+        vdev->nr_vectors = nr + 1;
+        ret = vfio_enable_vectors(vdev, true);
+        if (ret) {
+            error_report("vfio: failed to enable vectors, %d", ret);
+        }
+    } else {
+        int argsz;
+        struct vfio_irq_set *irq_set;
+        int32_t *pfd;
+
+        argsz = sizeof(*irq_set) + sizeof(*pfd);
+
+        irq_set = g_malloc0(argsz);
+        irq_set->argsz = argsz;
+        irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD |
+                         VFIO_IRQ_SET_ACTION_TRIGGER;
+        irq_set->index = VFIO_PCI_MSIX_IRQ_INDEX;
+        irq_set->start = nr;
+        irq_set->count = 1;
+        pfd = (int32_t *)&irq_set->data;
+
+        if (vector->virq >= 0) {
+            *pfd = event_notifier_get_fd(&vector->kvm_interrupt);
+        } else {
+            *pfd = event_notifier_get_fd(&vector->interrupt);
+        }
+
+        ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_SET_IRQS, irq_set);
+        g_free(irq_set);
+        if (ret) {
+            error_report("vfio: failed to modify vector, %d", ret);
+        }
+    }
+
+    return 0;
+}
+
+static int vfio_msix_vector_use(PCIDevice *pdev,
+                                unsigned int nr, MSIMessage msg)
+{
+    return vfio_msix_vector_do_use(pdev, nr, &msg, vfio_msi_interrupt);
+}
+
+static void vfio_msix_vector_release(PCIDevice *pdev, unsigned int nr)
+{
+    VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev);
+    VFIOMSIVector *vector = &vdev->msi_vectors[nr];
+
+    trace_vfio_msix_vector_release(vdev->vbasedev.name, nr);
+
+    /*
+     * There are still old guests that mask and unmask vectors on every
+     * interrupt.  If we're using QEMU bypass with a KVM irqfd, leave all of
+     * the KVM setup in place, simply switch VFIO to use the non-bypass
+     * eventfd.  We'll then fire the interrupt through QEMU and the MSI-X
+     * core will mask the interrupt and set pending bits, allowing it to
+     * be re-asserted on unmask.  Nothing to do if already using QEMU mode.
+     */
+    if (vector->virq >= 0) {
+        int argsz;
+        struct vfio_irq_set *irq_set;
+        int32_t *pfd;
+
+        argsz = sizeof(*irq_set) + sizeof(*pfd);
+
+        irq_set = g_malloc0(argsz);
+        irq_set->argsz = argsz;
+        irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD |
+                         VFIO_IRQ_SET_ACTION_TRIGGER;
+        irq_set->index = VFIO_PCI_MSIX_IRQ_INDEX;
+        irq_set->start = nr;
+        irq_set->count = 1;
+        pfd = (int32_t *)&irq_set->data;
+
+        *pfd = event_notifier_get_fd(&vector->interrupt);
+
+        ioctl(vdev->vbasedev.fd, VFIO_DEVICE_SET_IRQS, irq_set);
+
+        g_free(irq_set);
+    }
+}
+
+static void vfio_enable_msix(VFIOPCIDevice *vdev)
+{
+    vfio_disable_interrupts(vdev);
+
+    vdev->msi_vectors = g_malloc0(vdev->msix->entries * sizeof(VFIOMSIVector));
+
+    vdev->interrupt = VFIO_INT_MSIX;
+
+    /*
+     * Some communication channels between VF & PF or PF & fw rely on the
+     * physical state of the device and expect that enabling MSI-X from the
+     * guest enables the same on the host.  When our guest is Linux, the
+     * guest driver call to pci_enable_msix() sets the enabling bit in the
+     * MSI-X capability, but leaves the vector table masked.  We therefore
+     * can't rely on a vector_use callback (from request_irq() in the guest)
+     * to switch the physical device into MSI-X mode because that may come a
+     * long time after pci_enable_msix().  This code enables vector 0 with
+     * triggering to userspace, then immediately release the vector, leaving
+     * the physical device with no vectors enabled, but MSI-X enabled, just
+     * like the guest view.
+     */
+    vfio_msix_vector_do_use(&vdev->pdev, 0, NULL, NULL);
+    vfio_msix_vector_release(&vdev->pdev, 0);
+
+    if (msix_set_vector_notifiers(&vdev->pdev, vfio_msix_vector_use,
+                                  vfio_msix_vector_release, NULL)) {
+        error_report("vfio: msix_set_vector_notifiers failed");
+    }
+
+    trace_vfio_enable_msix(vdev->vbasedev.name);
+}
+
+static void vfio_enable_msi(VFIOPCIDevice *vdev)
+{
+    int ret, i;
+
+    vfio_disable_interrupts(vdev);
+
+    vdev->nr_vectors = msi_nr_vectors_allocated(&vdev->pdev);
+retry:
+    vdev->msi_vectors = g_malloc0(vdev->nr_vectors * sizeof(VFIOMSIVector));
+
+    for (i = 0; i < vdev->nr_vectors; i++) {
+        VFIOMSIVector *vector = &vdev->msi_vectors[i];
+        MSIMessage msg = msi_get_message(&vdev->pdev, i);
+
+        vector->vdev = vdev;
+        vector->virq = -1;
+        vector->use = true;
+
+        if (event_notifier_init(&vector->interrupt, 0)) {
+            error_report("vfio: Error: event_notifier_init failed");
+        }
+
+        qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt),
+                            vfio_msi_interrupt, NULL, vector);
+
+        /*
+         * Attempt to enable route through KVM irqchip,
+         * default to userspace handling if unavailable.
+         */
+        vfio_add_kvm_msi_virq(vector, &msg, false);
+    }
+
+    /* Set interrupt type prior to possible interrupts */
+    vdev->interrupt = VFIO_INT_MSI;
+
+    ret = vfio_enable_vectors(vdev, false);
+    if (ret) {
+        if (ret < 0) {
+            error_report("vfio: Error: Failed to setup MSI fds: %m");
+        } else if (ret != vdev->nr_vectors) {
+            error_report("vfio: Error: Failed to enable %d "
+                         "MSI vectors, retry with %d", vdev->nr_vectors, ret);
+        }
+
+        for (i = 0; i < vdev->nr_vectors; i++) {
+            VFIOMSIVector *vector = &vdev->msi_vectors[i];
+            if (vector->virq >= 0) {
+                vfio_remove_kvm_msi_virq(vector);
+            }
+            qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt),
+                                NULL, NULL, NULL);
+            event_notifier_cleanup(&vector->interrupt);
+        }
+
+        g_free(vdev->msi_vectors);
+
+        if (ret > 0 && ret != vdev->nr_vectors) {
+            vdev->nr_vectors = ret;
+            goto retry;
+        }
+        vdev->nr_vectors = 0;
+
+        /*
+         * Failing to setup MSI doesn't really fall within any specification.
+         * Let's try leaving interrupts disabled and hope the guest figures
+         * out to fall back to INTx for this device.
+         */
+        error_report("vfio: Error: Failed to enable MSI");
+        vdev->interrupt = VFIO_INT_NONE;
+
+        return;
+    }
+
+    trace_vfio_enable_msi(vdev->vbasedev.name, vdev->nr_vectors);
+}
+
+static void vfio_disable_msi_common(VFIOPCIDevice *vdev)
+{
+    int i;
+
+    for (i = 0; i < vdev->nr_vectors; i++) {
+        VFIOMSIVector *vector = &vdev->msi_vectors[i];
+        if (vdev->msi_vectors[i].use) {
+            if (vector->virq >= 0) {
+                vfio_remove_kvm_msi_virq(vector);
+            }
+            qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt),
+                                NULL, NULL, NULL);
+            event_notifier_cleanup(&vector->interrupt);
+        }
+    }
+
+    g_free(vdev->msi_vectors);
+    vdev->msi_vectors = NULL;
+    vdev->nr_vectors = 0;
+    vdev->interrupt = VFIO_INT_NONE;
+
+    vfio_enable_intx(vdev);
+}
+
+static void vfio_disable_msix(VFIOPCIDevice *vdev)
+{
+    int i;
+
+    msix_unset_vector_notifiers(&vdev->pdev);
+
+    /*
+     * MSI-X will only release vectors if MSI-X is still enabled on the
+     * device, check through the rest and release it ourselves if necessary.
+     */
+    for (i = 0; i < vdev->nr_vectors; i++) {
+        if (vdev->msi_vectors[i].use) {
+            vfio_msix_vector_release(&vdev->pdev, i);
+            msix_vector_unuse(&vdev->pdev, i);
+        }
+    }
+
+    if (vdev->nr_vectors) {
+        vfio_disable_irqindex(&vdev->vbasedev, VFIO_PCI_MSIX_IRQ_INDEX);
+    }
+
+    vfio_disable_msi_common(vdev);
+
+    trace_vfio_disable_msix(vdev->vbasedev.name);
+}
+
+static void vfio_disable_msi(VFIOPCIDevice *vdev)
+{
+    vfio_disable_irqindex(&vdev->vbasedev, VFIO_PCI_MSI_IRQ_INDEX);
+    vfio_disable_msi_common(vdev);
+
+    trace_vfio_disable_msi(vdev->vbasedev.name);
+}
+
+static void vfio_update_msi(VFIOPCIDevice *vdev)
+{
+    int i;
+
+    for (i = 0; i < vdev->nr_vectors; i++) {
+        VFIOMSIVector *vector = &vdev->msi_vectors[i];
+        MSIMessage msg;
+
+        if (!vector->use || vector->virq < 0) {
+            continue;
+        }
+
+        msg = msi_get_message(&vdev->pdev, i);
+        vfio_update_kvm_msi_virq(vector, msg);
+    }
+}
+
+static void vfio_pci_load_rom(VFIOPCIDevice *vdev)
+{
+    struct vfio_region_info reg_info = {
+        .argsz = sizeof(reg_info),
+        .index = VFIO_PCI_ROM_REGION_INDEX
+    };
+    uint64_t size;
+    off_t off = 0;
+    ssize_t bytes;
+
+    if (ioctl(vdev->vbasedev.fd, VFIO_DEVICE_GET_REGION_INFO, &reg_info)) {
+        error_report("vfio: Error getting ROM info: %m");
+        return;
+    }
+
+    trace_vfio_pci_load_rom(vdev->vbasedev.name, (unsigned long)reg_info.size,
+                            (unsigned long)reg_info.offset,
+                            (unsigned long)reg_info.flags);
+
+    vdev->rom_size = size = reg_info.size;
+    vdev->rom_offset = reg_info.offset;
+
+    if (!vdev->rom_size) {
+        vdev->rom_read_failed = true;
+        error_report("vfio-pci: Cannot read device rom at "
+                    "%s", vdev->vbasedev.name);
+        error_printf("Device option ROM contents are probably invalid "
+                    "(check dmesg).\nSkip option ROM probe with rombar=0, "
+                    "or load from file with romfile=\n");
+        return;
+    }
+
+    vdev->rom = g_malloc(size);
+    memset(vdev->rom, 0xff, size);
+
+    while (size) {
+        bytes = pread(vdev->vbasedev.fd, vdev->rom + off,
+                      size, vdev->rom_offset + off);
+        if (bytes == 0) {
+            break;
+        } else if (bytes > 0) {
+            off += bytes;
+            size -= bytes;
+        } else {
+            if (errno == EINTR || errno == EAGAIN) {
+                continue;
+            }
+            error_report("vfio: Error reading device ROM: %m");
+            break;
+        }
+    }
+}
+
+static uint64_t vfio_rom_read(void *opaque, hwaddr addr, unsigned size)
+{
+    VFIOPCIDevice *vdev = opaque;
+    union {
+        uint8_t byte;
+        uint16_t word;
+        uint32_t dword;
+        uint64_t qword;
+    } val;
+    uint64_t data = 0;
+
+    /* Load the ROM lazily when the guest tries to read it */
+    if (unlikely(!vdev->rom && !vdev->rom_read_failed)) {
+        vfio_pci_load_rom(vdev);
+    }
+
+    memcpy(&val, vdev->rom + addr,
+           (addr < vdev->rom_size) ? MIN(size, vdev->rom_size - addr) : 0);
+
+    switch (size) {
+    case 1:
+        data = val.byte;
+        break;
+    case 2:
+        data = le16_to_cpu(val.word);
+        break;
+    case 4:
+        data = le32_to_cpu(val.dword);
+        break;
+    default:
+        hw_error("vfio: unsupported read size, %d bytes\n", size);
+        break;
+    }
+
+    trace_vfio_rom_read(vdev->vbasedev.name, addr, size, data);
+
+    return data;
+}
+
+static void vfio_rom_write(void *opaque, hwaddr addr,
+                           uint64_t data, unsigned size)
+{
+}
+
+static const MemoryRegionOps vfio_rom_ops = {
+    .read = vfio_rom_read,
+    .write = vfio_rom_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+static bool vfio_blacklist_opt_rom(VFIOPCIDevice *vdev)
+{
+    PCIDevice *pdev = &vdev->pdev;
+    uint16_t vendor_id, device_id;
+    int count = 0;
+
+    vendor_id = pci_get_word(pdev->config + PCI_VENDOR_ID);
+    device_id = pci_get_word(pdev->config + PCI_DEVICE_ID);
+
+    while (count < ARRAY_SIZE(romblacklist)) {
+        if (romblacklist[count].vendor_id == vendor_id &&
+            romblacklist[count].device_id == device_id) {
+                return true;
+        }
+        count++;
+    }
+
+    return false;
+}
+
+static void vfio_pci_size_rom(VFIOPCIDevice *vdev)
+{
+    uint32_t orig, size = cpu_to_le32((uint32_t)PCI_ROM_ADDRESS_MASK);
+    off_t offset = vdev->config_offset + PCI_ROM_ADDRESS;
+    DeviceState *dev = DEVICE(vdev);
+    char name[32];
+    int fd = vdev->vbasedev.fd;
+
+    if (vdev->pdev.romfile || !vdev->pdev.rom_bar) {
+        /* Since pci handles romfile, just print a message and return */
+        if (vfio_blacklist_opt_rom(vdev) && vdev->pdev.romfile) {
+            error_printf("Warning : Device at %04x:%02x:%02x.%x "
+                         "is known to cause system instability issues during "
+                         "option rom execution. "
+                         "Proceeding anyway since user specified romfile\n",
+                         vdev->host.domain, vdev->host.bus, vdev->host.slot,
+                         vdev->host.function);
+        }
+        return;
+    }
+
+    /*
+     * Use the same size ROM BAR as the physical device.  The contents
+     * will get filled in later when the guest tries to read it.
+     */
+    if (pread(fd, &orig, 4, offset) != 4 ||
+        pwrite(fd, &size, 4, offset) != 4 ||
+        pread(fd, &size, 4, offset) != 4 ||
+        pwrite(fd, &orig, 4, offset) != 4) {
+        error_report("%s(%04x:%02x:%02x.%x) failed: %m",
+                     __func__, vdev->host.domain, vdev->host.bus,
+                     vdev->host.slot, vdev->host.function);
+        return;
+    }
+
+    size = ~(le32_to_cpu(size) & PCI_ROM_ADDRESS_MASK) + 1;
+
+    if (!size) {
+        return;
+    }
+
+    if (vfio_blacklist_opt_rom(vdev)) {
+        if (dev->opts && qemu_opt_get(dev->opts, "rombar")) {
+            error_printf("Warning : Device at %04x:%02x:%02x.%x "
+                         "is known to cause system instability issues during "
+                         "option rom execution. "
+                         "Proceeding anyway since user specified non zero value for "
+                         "rombar\n",
+                         vdev->host.domain, vdev->host.bus, vdev->host.slot,
+                         vdev->host.function);
+        } else {
+            error_printf("Warning : Rom loading for device at "
+                         "%04x:%02x:%02x.%x has been disabled due to "
+                         "system instability issues. "
+                         "Specify rombar=1 or romfile to force\n",
+                         vdev->host.domain, vdev->host.bus, vdev->host.slot,
+                         vdev->host.function);
+            return;
+        }
+    }
+
+    trace_vfio_pci_size_rom(vdev->vbasedev.name, size);
+
+    snprintf(name, sizeof(name), "vfio[%04x:%02x:%02x.%x].rom",
+             vdev->host.domain, vdev->host.bus, vdev->host.slot,
+             vdev->host.function);
+
+    memory_region_init_io(&vdev->pdev.rom, OBJECT(vdev),
+                          &vfio_rom_ops, vdev, name, size);
+
+    pci_register_bar(&vdev->pdev, PCI_ROM_SLOT,
+                     PCI_BASE_ADDRESS_SPACE_MEMORY, &vdev->pdev.rom);
+
+    vdev->pdev.has_rom = true;
+    vdev->rom_read_failed = false;
+}
+
+static void vfio_vga_write(void *opaque, hwaddr addr,
+                           uint64_t data, unsigned size)
+{
+    VFIOVGARegion *region = opaque;
+    VFIOVGA *vga = container_of(region, VFIOVGA, region[region->nr]);
+    union {
+        uint8_t byte;
+        uint16_t word;
+        uint32_t dword;
+        uint64_t qword;
+    } buf;
+    off_t offset = vga->fd_offset + region->offset + addr;
+
+    switch (size) {
+    case 1:
+        buf.byte = data;
+        break;
+    case 2:
+        buf.word = cpu_to_le16(data);
+        break;
+    case 4:
+        buf.dword = cpu_to_le32(data);
+        break;
+    default:
+        hw_error("vfio: unsupported write size, %d bytes", size);
+        break;
+    }
+
+    if (pwrite(vga->fd, &buf, size, offset) != size) {
+        error_report("%s(,0x%"HWADDR_PRIx", 0x%"PRIx64", %d) failed: %m",
+                     __func__, region->offset + addr, data, size);
+    }
+
+    trace_vfio_vga_write(region->offset + addr, data, size);
+}
+
+static uint64_t vfio_vga_read(void *opaque, hwaddr addr, unsigned size)
+{
+    VFIOVGARegion *region = opaque;
+    VFIOVGA *vga = container_of(region, VFIOVGA, region[region->nr]);
+    union {
+        uint8_t byte;
+        uint16_t word;
+        uint32_t dword;
+        uint64_t qword;
+    } buf;
+    uint64_t data = 0;
+    off_t offset = vga->fd_offset + region->offset + addr;
+
+    if (pread(vga->fd, &buf, size, offset) != size) {
+        error_report("%s(,0x%"HWADDR_PRIx", %d) failed: %m",
+                     __func__, region->offset + addr, size);
+        return (uint64_t)-1;
+    }
+
+    switch (size) {
+    case 1:
+        data = buf.byte;
+        break;
+    case 2:
+        data = le16_to_cpu(buf.word);
+        break;
+    case 4:
+        data = le32_to_cpu(buf.dword);
+        break;
+    default:
+        hw_error("vfio: unsupported read size, %d bytes", size);
+        break;
+    }
+
+    trace_vfio_vga_read(region->offset + addr, size, data);
+
+    return data;
+}
+
+static const MemoryRegionOps vfio_vga_ops = {
+    .read = vfio_vga_read,
+    .write = vfio_vga_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+/*
+ * Device specific quirks
+ */
+
+/* Is range1 fully contained within range2?  */
+static bool vfio_range_contained(uint64_t first1, uint64_t len1,
+                                 uint64_t first2, uint64_t len2) {
+    return (first1 >= first2 && first1 + len1 <= first2 + len2);
+}
+
+static bool vfio_flags_enabled(uint8_t flags, uint8_t mask)
+{
+    return (mask && (flags & mask) == mask);
+}
+
+static uint64_t vfio_generic_window_quirk_read(void *opaque,
+                                               hwaddr addr, unsigned size)
+{
+    VFIOQuirk *quirk = opaque;
+    VFIOPCIDevice *vdev = quirk->vdev;
+    uint64_t data;
+
+    if (vfio_flags_enabled(quirk->data.flags, quirk->data.read_flags) &&
+        ranges_overlap(addr, size,
+                       quirk->data.data_offset, quirk->data.data_size)) {
+        hwaddr offset = addr - quirk->data.data_offset;
+
+        if (!vfio_range_contained(addr, size, quirk->data.data_offset,
+                                  quirk->data.data_size)) {
+            hw_error("%s: window data read not fully contained: %s",
+                     __func__, memory_region_name(&quirk->mem));
+        }
+
+        data = vfio_pci_read_config(&vdev->pdev,
+                                    quirk->data.address_val + offset, size);
+
+        trace_vfio_generic_window_quirk_read(memory_region_name(&quirk->mem),
+                                             vdev->vbasedev.name,
+                                             quirk->data.bar,
+                                             addr, size, data);
+    } else {
+        data = vfio_region_read(&vdev->bars[quirk->data.bar].region,
+                                addr + quirk->data.base_offset, size);
+    }
+
+    return data;
+}
+
+static void vfio_generic_window_quirk_write(void *opaque, hwaddr addr,
+                                            uint64_t data, unsigned size)
+{
+    VFIOQuirk *quirk = opaque;
+    VFIOPCIDevice *vdev = quirk->vdev;
+
+    if (ranges_overlap(addr, size,
+                       quirk->data.address_offset, quirk->data.address_size)) {
+
+        if (addr != quirk->data.address_offset) {
+            hw_error("%s: offset write into address window: %s",
+                     __func__, memory_region_name(&quirk->mem));
+        }
+
+        if ((data & ~quirk->data.address_mask) == quirk->data.address_match) {
+            quirk->data.flags |= quirk->data.write_flags |
+                                 quirk->data.read_flags;
+            quirk->data.address_val = data & quirk->data.address_mask;
+        } else {
+            quirk->data.flags &= ~(quirk->data.write_flags |
+                                   quirk->data.read_flags);
+        }
+    }
+
+    if (vfio_flags_enabled(quirk->data.flags, quirk->data.write_flags) &&
+        ranges_overlap(addr, size,
+                       quirk->data.data_offset, quirk->data.data_size)) {
+        hwaddr offset = addr - quirk->data.data_offset;
+
+        if (!vfio_range_contained(addr, size, quirk->data.data_offset,
+                                  quirk->data.data_size)) {
+            hw_error("%s: window data write not fully contained: %s",
+                     __func__, memory_region_name(&quirk->mem));
+        }
+
+        vfio_pci_write_config(&vdev->pdev,
+                              quirk->data.address_val + offset, data, size);
+        trace_vfio_generic_window_quirk_write(memory_region_name(&quirk->mem),
+                                              vdev->vbasedev.name,
+                                              quirk->data.bar,
+                                              addr, data, size);
+        return;
+    }
+
+    vfio_region_write(&vdev->bars[quirk->data.bar].region,
+                   addr + quirk->data.base_offset, data, size);
+}
+
+static const MemoryRegionOps vfio_generic_window_quirk = {
+    .read = vfio_generic_window_quirk_read,
+    .write = vfio_generic_window_quirk_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+static uint64_t vfio_generic_quirk_read(void *opaque,
+                                        hwaddr addr, unsigned size)
+{
+    VFIOQuirk *quirk = opaque;
+    VFIOPCIDevice *vdev = quirk->vdev;
+    hwaddr base = quirk->data.address_match & TARGET_PAGE_MASK;
+    hwaddr offset = quirk->data.address_match & ~TARGET_PAGE_MASK;
+    uint64_t data;
+
+    if (vfio_flags_enabled(quirk->data.flags, quirk->data.read_flags) &&
+        ranges_overlap(addr, size, offset, quirk->data.address_mask + 1)) {
+        if (!vfio_range_contained(addr, size, offset,
+                                  quirk->data.address_mask + 1)) {
+            hw_error("%s: read not fully contained: %s",
+                     __func__, memory_region_name(&quirk->mem));
+        }
+
+        data = vfio_pci_read_config(&vdev->pdev, addr - offset, size);
+
+        trace_vfio_generic_quirk_read(memory_region_name(&quirk->mem),
+                                      vdev->vbasedev.name, quirk->data.bar,
+                                      addr + base, size, data);
+    } else {
+        data = vfio_region_read(&vdev->bars[quirk->data.bar].region,
+                                addr + base, size);
+    }
+
+    return data;
+}
+
+static void vfio_generic_quirk_write(void *opaque, hwaddr addr,
+                                     uint64_t data, unsigned size)
+{
+    VFIOQuirk *quirk = opaque;
+    VFIOPCIDevice *vdev = quirk->vdev;
+    hwaddr base = quirk->data.address_match & TARGET_PAGE_MASK;
+    hwaddr offset = quirk->data.address_match & ~TARGET_PAGE_MASK;
+
+    if (vfio_flags_enabled(quirk->data.flags, quirk->data.write_flags) &&
+        ranges_overlap(addr, size, offset, quirk->data.address_mask + 1)) {
+        if (!vfio_range_contained(addr, size, offset,
+                                  quirk->data.address_mask + 1)) {
+            hw_error("%s: write not fully contained: %s",
+                     __func__, memory_region_name(&quirk->mem));
+        }
+
+        vfio_pci_write_config(&vdev->pdev, addr - offset, data, size);
+
+        trace_vfio_generic_quirk_write(memory_region_name(&quirk->mem),
+                                       vdev->vbasedev.name, quirk->data.bar,
+                                       addr + base, data, size);
+    } else {
+        vfio_region_write(&vdev->bars[quirk->data.bar].region,
+                          addr + base, data, size);
+    }
+}
+
+static const MemoryRegionOps vfio_generic_quirk = {
+    .read = vfio_generic_quirk_read,
+    .write = vfio_generic_quirk_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+#define PCI_VENDOR_ID_ATI               0x1002
+
+/*
+ * Radeon HD cards (HD5450 & HD7850) report the upper byte of the I/O port BAR
+ * through VGA register 0x3c3.  On newer cards, the I/O port BAR is always
+ * BAR4 (older cards like the X550 used BAR1, but we don't care to support
+ * those).  Note that on bare metal, a read of 0x3c3 doesn't always return the
+ * I/O port BAR address.  Originally this was coded to return the virtual BAR
+ * address only if the physical register read returns the actual BAR address,
+ * but users have reported greater success if we return the virtual address
+ * unconditionally.
+ */
+static uint64_t vfio_ati_3c3_quirk_read(void *opaque,
+                                        hwaddr addr, unsigned size)
+{
+    VFIOQuirk *quirk = opaque;
+    VFIOPCIDevice *vdev = quirk->vdev;
+    uint64_t data = vfio_pci_read_config(&vdev->pdev,
+                                         PCI_BASE_ADDRESS_0 + (4 * 4) + 1,
+                                         size);
+    trace_vfio_ati_3c3_quirk_read(data);
+
+    return data;
+}
+
+static const MemoryRegionOps vfio_ati_3c3_quirk = {
+    .read = vfio_ati_3c3_quirk_read,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+static void vfio_vga_probe_ati_3c3_quirk(VFIOPCIDevice *vdev)
+{
+    PCIDevice *pdev = &vdev->pdev;
+    VFIOQuirk *quirk;
+
+    if (pci_get_word(pdev->config + PCI_VENDOR_ID) != PCI_VENDOR_ID_ATI) {
+        return;
+    }
+
+    /*
+     * As long as the BAR is >= 256 bytes it will be aligned such that the
+     * lower byte is always zero.  Filter out anything else, if it exists.
+     */
+    if (!vdev->bars[4].ioport || vdev->bars[4].region.size < 256) {
+        return;
+    }
+
+    quirk = g_malloc0(sizeof(*quirk));
+    quirk->vdev = vdev;
+
+    memory_region_init_io(&quirk->mem, OBJECT(vdev), &vfio_ati_3c3_quirk, quirk,
+                          "vfio-ati-3c3-quirk", 1);
+    memory_region_add_subregion(&vdev->vga.region[QEMU_PCI_VGA_IO_HI].mem,
+                                3 /* offset 3 bytes from 0x3c0 */, &quirk->mem);
+
+    QLIST_INSERT_HEAD(&vdev->vga.region[QEMU_PCI_VGA_IO_HI].quirks,
+                      quirk, next);
+
+    trace_vfio_vga_probe_ati_3c3_quirk(vdev->vbasedev.name);
+}
+
+/*
+ * Newer ATI/AMD devices, including HD5450 and HD7850, have a window to PCI
+ * config space through MMIO BAR2 at offset 0x4000.  Nothing seems to access
+ * the MMIO space directly, but a window to this space is provided through
+ * I/O port BAR4.  Offset 0x0 is the address register and offset 0x4 is the
+ * data register.  When the address is programmed to a range of 0x4000-0x4fff
+ * PCI configuration space is available.  Experimentation seems to indicate
+ * that only read-only access is provided, but we drop writes when the window
+ * is enabled to config space nonetheless.
+ */
+static void vfio_probe_ati_bar4_window_quirk(VFIOPCIDevice *vdev, int nr)
+{
+    PCIDevice *pdev = &vdev->pdev;
+    VFIOQuirk *quirk;
+
+    if (!vdev->has_vga || nr != 4 ||
+        pci_get_word(pdev->config + PCI_VENDOR_ID) != PCI_VENDOR_ID_ATI) {
+        return;
+    }
+
+    quirk = g_malloc0(sizeof(*quirk));
+    quirk->vdev = vdev;
+    quirk->data.address_size = 4;
+    quirk->data.data_offset = 4;
+    quirk->data.data_size = 4;
+    quirk->data.address_match = 0x4000;
+    quirk->data.address_mask = PCIE_CONFIG_SPACE_SIZE - 1;
+    quirk->data.bar = nr;
+    quirk->data.read_flags = quirk->data.write_flags = 1;
+
+    memory_region_init_io(&quirk->mem, OBJECT(vdev),
+                          &vfio_generic_window_quirk, quirk,
+                          "vfio-ati-bar4-window-quirk", 8);
+    memory_region_add_subregion_overlap(&vdev->bars[nr].region.mem,
+                          quirk->data.base_offset, &quirk->mem, 1);
+
+    QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
+
+    trace_vfio_probe_ati_bar4_window_quirk(vdev->vbasedev.name);
+}
+
+#define PCI_VENDOR_ID_REALTEK 0x10ec
+
+/*
+ * RTL8168 devices have a backdoor that can access the MSI-X table.  At BAR2
+ * offset 0x70 there is a dword data register, offset 0x74 is a dword address
+ * register.  According to the Linux r8169 driver, the MSI-X table is addressed
+ * when the "type" portion of the address register is set to 0x1.  This appears
+ * to be bits 16:30.  Bit 31 is both a write indicator and some sort of
+ * "address latched" indicator.  Bits 12:15 are a mask field, which we can
+ * ignore because the MSI-X table should always be accessed as a dword (full
+ * mask).  Bits 0:11 is offset within the type.
+ *
+ * Example trace:
+ *
+ * Read from MSI-X table offset 0
+ * vfio: vfio_bar_write(0000:05:00.0:BAR2+0x74, 0x1f000, 4) // store read addr
+ * vfio: vfio_bar_read(0000:05:00.0:BAR2+0x74, 4) = 0x8001f000 // latch
+ * vfio: vfio_bar_read(0000:05:00.0:BAR2+0x70, 4) = 0xfee00398 // read data
+ *
+ * Write 0xfee00000 to MSI-X table offset 0
+ * vfio: vfio_bar_write(0000:05:00.0:BAR2+0x70, 0xfee00000, 4) // write data
+ * vfio: vfio_bar_write(0000:05:00.0:BAR2+0x74, 0x8001f000, 4) // do write
+ * vfio: vfio_bar_read(0000:05:00.0:BAR2+0x74, 4) = 0x1f000 // complete
+ */
+
+static uint64_t vfio_rtl8168_window_quirk_read(void *opaque,
+                                               hwaddr addr, unsigned size)
+{
+    VFIOQuirk *quirk = opaque;
+    VFIOPCIDevice *vdev = quirk->vdev;
+
+    switch (addr) {
+    case 4: /* address */
+        if (quirk->data.flags) {
+            trace_vfio_rtl8168_window_quirk_read_fake(
+                    memory_region_name(&quirk->mem),
+                    vdev->vbasedev.name);
+
+            return quirk->data.address_match ^ 0x80000000U;
+        }
+        break;
+    case 0: /* data */
+        if (quirk->data.flags) {
+            uint64_t val;
+
+            trace_vfio_rtl8168_window_quirk_read_table(
+                    memory_region_name(&quirk->mem),
+                    vdev->vbasedev.name);
+
+            if (!(vdev->pdev.cap_present & QEMU_PCI_CAP_MSIX)) {
+                return 0;
+            }
+
+            memory_region_dispatch_read(&vdev->pdev.msix_table_mmio,
+                                        (hwaddr)(quirk->data.address_match
+                                                 & 0xfff),
+                                        &val,
+                                        size,
+                                        MEMTXATTRS_UNSPECIFIED);
+            return val;
+        }
+    }
+
+    trace_vfio_rtl8168_window_quirk_read_direct(memory_region_name(&quirk->mem),
+                                                vdev->vbasedev.name);
+
+    return vfio_region_read(&vdev->bars[quirk->data.bar].region,
+                            addr + 0x70, size);
+}
+
+static void vfio_rtl8168_window_quirk_write(void *opaque, hwaddr addr,
+                                            uint64_t data, unsigned size)
+{
+    VFIOQuirk *quirk = opaque;
+    VFIOPCIDevice *vdev = quirk->vdev;
+
+    switch (addr) {
+    case 4: /* address */
+        if ((data & 0x7fff0000) == 0x10000) {
+            if (data & 0x80000000U &&
+                vdev->pdev.cap_present & QEMU_PCI_CAP_MSIX) {
+
+                trace_vfio_rtl8168_window_quirk_write_table(
+                        memory_region_name(&quirk->mem),
+                        vdev->vbasedev.name);
+
+                memory_region_dispatch_write(&vdev->pdev.msix_table_mmio,
+                                             (hwaddr)(data & 0xfff),
+                                             (uint64_t)quirk->data.address_mask,
+                                             size, MEMTXATTRS_UNSPECIFIED);
+            }
+
+            quirk->data.flags = 1;
+            quirk->data.address_match = data;
+
+            return;
+        }
+        quirk->data.flags = 0;
+        break;
+    case 0: /* data */
+        quirk->data.address_mask = data;
+        break;
+    }
+
+    trace_vfio_rtl8168_window_quirk_write_direct(
+            memory_region_name(&quirk->mem),
+            vdev->vbasedev.name);
+
+    vfio_region_write(&vdev->bars[quirk->data.bar].region,
+                      addr + 0x70, data, size);
+}
+
+static const MemoryRegionOps vfio_rtl8168_window_quirk = {
+    .read = vfio_rtl8168_window_quirk_read,
+    .write = vfio_rtl8168_window_quirk_write,
+    .valid = {
+        .min_access_size = 4,
+        .max_access_size = 4,
+        .unaligned = false,
+    },
+    .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+static void vfio_probe_rtl8168_bar2_window_quirk(VFIOPCIDevice *vdev, int nr)
+{
+    PCIDevice *pdev = &vdev->pdev;
+    VFIOQuirk *quirk;
+
+    if (pci_get_word(pdev->config + PCI_VENDOR_ID) != PCI_VENDOR_ID_REALTEK ||
+        pci_get_word(pdev->config + PCI_DEVICE_ID) != 0x8168 || nr != 2) {
+        return;
+    }
+
+    quirk = g_malloc0(sizeof(*quirk));
+    quirk->vdev = vdev;
+    quirk->data.bar = nr;
+
+    memory_region_init_io(&quirk->mem, OBJECT(vdev), &vfio_rtl8168_window_quirk,
+                          quirk, "vfio-rtl8168-window-quirk", 8);
+    memory_region_add_subregion_overlap(&vdev->bars[nr].region.mem,
+                                        0x70, &quirk->mem, 1);
+
+    QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
+
+    trace_vfio_probe_rtl8168_bar2_window_quirk(vdev->vbasedev.name);
+}
+/*
+ * Trap the BAR2 MMIO window to config space as well.
+ */
+static void vfio_probe_ati_bar2_4000_quirk(VFIOPCIDevice *vdev, int nr)
+{
+    PCIDevice *pdev = &vdev->pdev;
+    VFIOQuirk *quirk;
+
+    /* Only enable on newer devices where BAR2 is 64bit */
+    if (!vdev->has_vga || nr != 2 || !vdev->bars[2].mem64 ||
+        pci_get_word(pdev->config + PCI_VENDOR_ID) != PCI_VENDOR_ID_ATI) {
+        return;
+    }
+
+    quirk = g_malloc0(sizeof(*quirk));
+    quirk->vdev = vdev;
+    quirk->data.flags = quirk->data.read_flags = quirk->data.write_flags = 1;
+    quirk->data.address_match = 0x4000;
+    quirk->data.address_mask = PCIE_CONFIG_SPACE_SIZE - 1;
+    quirk->data.bar = nr;
+
+    memory_region_init_io(&quirk->mem, OBJECT(vdev), &vfio_generic_quirk, quirk,
+                          "vfio-ati-bar2-4000-quirk",
+                          TARGET_PAGE_ALIGN(quirk->data.address_mask + 1));
+    memory_region_add_subregion_overlap(&vdev->bars[nr].region.mem,
+                          quirk->data.address_match & TARGET_PAGE_MASK,
+                          &quirk->mem, 1);
+
+    QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
+
+    trace_vfio_probe_ati_bar2_4000_quirk(vdev->vbasedev.name);
+}
+
+/*
+ * Older ATI/AMD cards like the X550 have a similar window to that above.
+ * I/O port BAR1 provides a window to a mirror of PCI config space located
+ * in BAR2 at offset 0xf00.  We don't care to support such older cards, but
+ * note it for future reference.
+ */
+
+#define PCI_VENDOR_ID_NVIDIA                    0x10de
+
+/*
+ * Nvidia has several different methods to get to config space, the
+ * nouveu project has several of these documented here:
+ * https://github.com/pathscale/envytools/tree/master/hwdocs
+ *
+ * The first quirk is actually not documented in envytools and is found
+ * on 10de:01d1 (NVIDIA Corporation G72 [GeForce 7300 LE]).  This is an
+ * NV46 chipset.  The backdoor uses the legacy VGA I/O ports to access
+ * the mirror of PCI config space found at BAR0 offset 0x1800.  The access
+ * sequence first writes 0x338 to I/O port 0x3d4.  The target offset is
+ * then written to 0x3d0.  Finally 0x538 is written for a read and 0x738
+ * is written for a write to 0x3d4.  The BAR0 offset is then accessible
+ * through 0x3d0.  This quirk doesn't seem to be necessary on newer cards
+ * that use the I/O port BAR5 window but it doesn't hurt to leave it.
+ */
+enum {
+    NV_3D0_NONE = 0,
+    NV_3D0_SELECT,
+    NV_3D0_WINDOW,
+    NV_3D0_READ,
+    NV_3D0_WRITE,
+};
+
+static uint64_t vfio_nvidia_3d0_quirk_read(void *opaque,
+                                           hwaddr addr, unsigned size)
+{
+    VFIOQuirk *quirk = opaque;
+    VFIOPCIDevice *vdev = quirk->vdev;
+    PCIDevice *pdev = &vdev->pdev;
+    uint64_t data = vfio_vga_read(&vdev->vga.region[QEMU_PCI_VGA_IO_HI],
+                                  addr + quirk->data.base_offset, size);
+
+    if (quirk->data.flags == NV_3D0_READ && addr == quirk->data.data_offset) {
+        data = vfio_pci_read_config(pdev, quirk->data.address_val, size);
+        trace_vfio_nvidia_3d0_quirk_read(size, data);
+    }
+
+    quirk->data.flags = NV_3D0_NONE;
+
+    return data;
+}
+
+static void vfio_nvidia_3d0_quirk_write(void *opaque, hwaddr addr,
+                                        uint64_t data, unsigned size)
+{
+    VFIOQuirk *quirk = opaque;
+    VFIOPCIDevice *vdev = quirk->vdev;
+    PCIDevice *pdev = &vdev->pdev;
+
+    switch (quirk->data.flags) {
+    case NV_3D0_NONE:
+        if (addr == quirk->data.address_offset && data == 0x338) {
+            quirk->data.flags = NV_3D0_SELECT;
+        }
+        break;
+    case NV_3D0_SELECT:
+        quirk->data.flags = NV_3D0_NONE;
+        if (addr == quirk->data.data_offset &&
+            (data & ~quirk->data.address_mask) == quirk->data.address_match) {
+            quirk->data.flags = NV_3D0_WINDOW;
+            quirk->data.address_val = data & quirk->data.address_mask;
+        }
+        break;
+    case NV_3D0_WINDOW:
+        quirk->data.flags = NV_3D0_NONE;
+        if (addr == quirk->data.address_offset) {
+            if (data == 0x538) {
+                quirk->data.flags = NV_3D0_READ;
+            } else if (data == 0x738) {
+                quirk->data.flags = NV_3D0_WRITE;
+            }
+        }
+        break;
+    case NV_3D0_WRITE:
+        quirk->data.flags = NV_3D0_NONE;
+        if (addr == quirk->data.data_offset) {
+            vfio_pci_write_config(pdev, quirk->data.address_val, data, size);
+            trace_vfio_nvidia_3d0_quirk_write(data, size);
+            return;
+        }
+        break;
+    }
+
+    vfio_vga_write(&vdev->vga.region[QEMU_PCI_VGA_IO_HI],
+                   addr + quirk->data.base_offset, data, size);
+}
+
+static const MemoryRegionOps vfio_nvidia_3d0_quirk = {
+    .read = vfio_nvidia_3d0_quirk_read,
+    .write = vfio_nvidia_3d0_quirk_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+static void vfio_vga_probe_nvidia_3d0_quirk(VFIOPCIDevice *vdev)
+{
+    PCIDevice *pdev = &vdev->pdev;
+    VFIOQuirk *quirk;
+
+    if (pci_get_word(pdev->config + PCI_VENDOR_ID) != PCI_VENDOR_ID_NVIDIA ||
+        !vdev->bars[1].region.size) {
+        return;
+    }
+
+    quirk = g_malloc0(sizeof(*quirk));
+    quirk->vdev = vdev;
+    quirk->data.base_offset = 0x10;
+    quirk->data.address_offset = 4;
+    quirk->data.address_size = 2;
+    quirk->data.address_match = 0x1800;
+    quirk->data.address_mask = PCI_CONFIG_SPACE_SIZE - 1;
+    quirk->data.data_offset = 0;
+    quirk->data.data_size = 4;
+
+    memory_region_init_io(&quirk->mem, OBJECT(vdev), &vfio_nvidia_3d0_quirk,
+                          quirk, "vfio-nvidia-3d0-quirk", 6);
+    memory_region_add_subregion(&vdev->vga.region[QEMU_PCI_VGA_IO_HI].mem,
+                                quirk->data.base_offset, &quirk->mem);
+
+    QLIST_INSERT_HEAD(&vdev->vga.region[QEMU_PCI_VGA_IO_HI].quirks,
+                      quirk, next);
+
+    trace_vfio_vga_probe_nvidia_3d0_quirk(vdev->vbasedev.name);
+}
+
+/*
+ * The second quirk is documented in envytools.  The I/O port BAR5 is just
+ * a set of address/data ports to the MMIO BARs.  The BAR we care about is
+ * again BAR0.  This backdoor is apparently a bit newer than the one above
+ * so we need to not only trap 256 bytes @0x1800, but all of PCI config
+ * space, including extended space is available at the 4k @0x88000.
+ */
+enum {
+    NV_BAR5_ADDRESS = 0x1,
+    NV_BAR5_ENABLE = 0x2,
+    NV_BAR5_MASTER = 0x4,
+    NV_BAR5_VALID = 0x7,
+};
+
+static void vfio_nvidia_bar5_window_quirk_write(void *opaque, hwaddr addr,
+                                                uint64_t data, unsigned size)
+{
+    VFIOQuirk *quirk = opaque;
+
+    switch (addr) {
+    case 0x0:
+        if (data & 0x1) {
+            quirk->data.flags |= NV_BAR5_MASTER;
+        } else {
+            quirk->data.flags &= ~NV_BAR5_MASTER;
+        }
+        break;
+    case 0x4:
+        if (data & 0x1) {
+            quirk->data.flags |= NV_BAR5_ENABLE;
+        } else {
+            quirk->data.flags &= ~NV_BAR5_ENABLE;
+        }
+        break;
+    case 0x8:
+        if (quirk->data.flags & NV_BAR5_MASTER) {
+            if ((data & ~0xfff) == 0x88000) {
+                quirk->data.flags |= NV_BAR5_ADDRESS;
+                quirk->data.address_val = data & 0xfff;
+            } else if ((data & ~0xff) == 0x1800) {
+                quirk->data.flags |= NV_BAR5_ADDRESS;
+                quirk->data.address_val = data & 0xff;
+            } else {
+                quirk->data.flags &= ~NV_BAR5_ADDRESS;
+            }
+        }
+        break;
+    }
+
+    vfio_generic_window_quirk_write(opaque, addr, data, size);
+}
+
+static const MemoryRegionOps vfio_nvidia_bar5_window_quirk = {
+    .read = vfio_generic_window_quirk_read,
+    .write = vfio_nvidia_bar5_window_quirk_write,
+    .valid.min_access_size = 4,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+static void vfio_probe_nvidia_bar5_window_quirk(VFIOPCIDevice *vdev, int nr)
+{
+    PCIDevice *pdev = &vdev->pdev;
+    VFIOQuirk *quirk;
+
+    if (!vdev->has_vga || nr != 5 ||
+        pci_get_word(pdev->config + PCI_VENDOR_ID) != PCI_VENDOR_ID_NVIDIA) {
+        return;
+    }
+
+    quirk = g_malloc0(sizeof(*quirk));
+    quirk->vdev = vdev;
+    quirk->data.read_flags = quirk->data.write_flags = NV_BAR5_VALID;
+    quirk->data.address_offset = 0x8;
+    quirk->data.address_size = 0; /* actually 4, but avoids generic code */
+    quirk->data.data_offset = 0xc;
+    quirk->data.data_size = 4;
+    quirk->data.bar = nr;
+
+    memory_region_init_io(&quirk->mem, OBJECT(vdev),
+                          &vfio_nvidia_bar5_window_quirk, quirk,
+                          "vfio-nvidia-bar5-window-quirk", 16);
+    memory_region_add_subregion_overlap(&vdev->bars[nr].region.mem,
+                                        0, &quirk->mem, 1);
+
+    QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
+
+    trace_vfio_probe_nvidia_bar5_window_quirk(vdev->vbasedev.name);
+}
+
+static void vfio_nvidia_88000_quirk_write(void *opaque, hwaddr addr,
+                                          uint64_t data, unsigned size)
+{
+    VFIOQuirk *quirk = opaque;
+    VFIOPCIDevice *vdev = quirk->vdev;
+    PCIDevice *pdev = &vdev->pdev;
+    hwaddr base = quirk->data.address_match & TARGET_PAGE_MASK;
+
+    vfio_generic_quirk_write(opaque, addr, data, size);
+
+    /*
+     * Nvidia seems to acknowledge MSI interrupts by writing 0xff to the
+     * MSI capability ID register.  Both the ID and next register are
+     * read-only, so we allow writes covering either of those to real hw.
+     * NB - only fixed for the 0x88000 MMIO window.
+     */
+    if ((pdev->cap_present & QEMU_PCI_CAP_MSI) &&
+        vfio_range_contained(addr, size, pdev->msi_cap, PCI_MSI_FLAGS)) {
+        vfio_region_write(&vdev->bars[quirk->data.bar].region,
+                          addr + base, data, size);
+    }
+}
+
+static const MemoryRegionOps vfio_nvidia_88000_quirk = {
+    .read = vfio_generic_quirk_read,
+    .write = vfio_nvidia_88000_quirk_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+/*
+ * Finally, BAR0 itself.  We want to redirect any accesses to either
+ * 0x1800 or 0x88000 through the PCI config space access functions.
+ *
+ * NB - quirk at a page granularity or else they don't seem to work when
+ *      BARs are mmap'd
+ *
+ * Here's offset 0x88000...
+ */
+static void vfio_probe_nvidia_bar0_88000_quirk(VFIOPCIDevice *vdev, int nr)
+{
+    PCIDevice *pdev = &vdev->pdev;
+    VFIOQuirk *quirk;
+    uint16_t vendor, class;
+
+    vendor = pci_get_word(pdev->config + PCI_VENDOR_ID);
+    class = pci_get_word(pdev->config + PCI_CLASS_DEVICE);
+
+    if (nr != 0 || vendor != PCI_VENDOR_ID_NVIDIA ||
+        class != PCI_CLASS_DISPLAY_VGA) {
+        return;
+    }
+
+    quirk = g_malloc0(sizeof(*quirk));
+    quirk->vdev = vdev;
+    quirk->data.flags = quirk->data.read_flags = quirk->data.write_flags = 1;
+    quirk->data.address_match = 0x88000;
+    quirk->data.address_mask = PCIE_CONFIG_SPACE_SIZE - 1;
+    quirk->data.bar = nr;
+
+    memory_region_init_io(&quirk->mem, OBJECT(vdev), &vfio_nvidia_88000_quirk,
+                          quirk, "vfio-nvidia-bar0-88000-quirk",
+                          TARGET_PAGE_ALIGN(quirk->data.address_mask + 1));
+    memory_region_add_subregion_overlap(&vdev->bars[nr].region.mem,
+                          quirk->data.address_match & TARGET_PAGE_MASK,
+                          &quirk->mem, 1);
+
+    QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
+
+    trace_vfio_probe_nvidia_bar0_88000_quirk(vdev->vbasedev.name);
+}
+
+/*
+ * And here's the same for BAR0 offset 0x1800...
+ */
+static void vfio_probe_nvidia_bar0_1800_quirk(VFIOPCIDevice *vdev, int nr)
+{
+    PCIDevice *pdev = &vdev->pdev;
+    VFIOQuirk *quirk;
+
+    if (!vdev->has_vga || nr != 0 ||
+        pci_get_word(pdev->config + PCI_VENDOR_ID) != PCI_VENDOR_ID_NVIDIA) {
+        return;
+    }
+
+    /* Log the chipset ID */
+    trace_vfio_probe_nvidia_bar0_1800_quirk_id(
+            (unsigned int)(vfio_region_read(&vdev->bars[0].region, 0, 4) >> 20)
+            & 0xff);
+
+    quirk = g_malloc0(sizeof(*quirk));
+    quirk->vdev = vdev;
+    quirk->data.flags = quirk->data.read_flags = quirk->data.write_flags = 1;
+    quirk->data.address_match = 0x1800;
+    quirk->data.address_mask = PCI_CONFIG_SPACE_SIZE - 1;
+    quirk->data.bar = nr;
+
+    memory_region_init_io(&quirk->mem, OBJECT(vdev), &vfio_generic_quirk, quirk,
+                          "vfio-nvidia-bar0-1800-quirk",
+                          TARGET_PAGE_ALIGN(quirk->data.address_mask + 1));
+    memory_region_add_subregion_overlap(&vdev->bars[nr].region.mem,
+                          quirk->data.address_match & TARGET_PAGE_MASK,
+                          &quirk->mem, 1);
+
+    QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
+
+    trace_vfio_probe_nvidia_bar0_1800_quirk(vdev->vbasedev.name);
+}
+
+/*
+ * TODO - Some Nvidia devices provide config access to their companion HDA
+ * device and even to their parent bridge via these config space mirrors.
+ * Add quirks for those regions.
+ */
+
+/*
+ * Common quirk probe entry points.
+ */
+static void vfio_vga_quirk_setup(VFIOPCIDevice *vdev)
+{
+    vfio_vga_probe_ati_3c3_quirk(vdev);
+    vfio_vga_probe_nvidia_3d0_quirk(vdev);
+}
+
+static void vfio_vga_quirk_teardown(VFIOPCIDevice *vdev)
+{
+    VFIOQuirk *quirk;
+    int i;
+
+    for (i = 0; i < ARRAY_SIZE(vdev->vga.region); i++) {
+        QLIST_FOREACH(quirk, &vdev->vga.region[i].quirks, next) {
+            memory_region_del_subregion(&vdev->vga.region[i].mem, &quirk->mem);
+        }
+    }
+}
+
+static void vfio_vga_quirk_free(VFIOPCIDevice *vdev)
+{
+    int i;
+
+    for (i = 0; i < ARRAY_SIZE(vdev->vga.region); i++) {
+        while (!QLIST_EMPTY(&vdev->vga.region[i].quirks)) {
+            VFIOQuirk *quirk = QLIST_FIRST(&vdev->vga.region[i].quirks);
+            object_unparent(OBJECT(&quirk->mem));
+            QLIST_REMOVE(quirk, next);
+            g_free(quirk);
+        }
+    }
+}
+
+static void vfio_bar_quirk_setup(VFIOPCIDevice *vdev, int nr)
+{
+    vfio_probe_ati_bar4_window_quirk(vdev, nr);
+    vfio_probe_ati_bar2_4000_quirk(vdev, nr);
+    vfio_probe_nvidia_bar5_window_quirk(vdev, nr);
+    vfio_probe_nvidia_bar0_88000_quirk(vdev, nr);
+    vfio_probe_nvidia_bar0_1800_quirk(vdev, nr);
+    vfio_probe_rtl8168_bar2_window_quirk(vdev, nr);
+}
+
+static void vfio_bar_quirk_teardown(VFIOPCIDevice *vdev, int nr)
+{
+    VFIOBAR *bar = &vdev->bars[nr];
+    VFIOQuirk *quirk;
+
+    QLIST_FOREACH(quirk, &bar->quirks, next) {
+        memory_region_del_subregion(&bar->region.mem, &quirk->mem);
+    }
+}
+
+static void vfio_bar_quirk_free(VFIOPCIDevice *vdev, int nr)
+{
+    VFIOBAR *bar = &vdev->bars[nr];
+
+    while (!QLIST_EMPTY(&bar->quirks)) {
+        VFIOQuirk *quirk = QLIST_FIRST(&bar->quirks);
+        object_unparent(OBJECT(&quirk->mem));
+        QLIST_REMOVE(quirk, next);
+        g_free(quirk);
+    }
+}
+
+/*
+ * PCI config space
+ */
+static uint32_t vfio_pci_read_config(PCIDevice *pdev, uint32_t addr, int len)
+{
+    VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev);
+    uint32_t emu_bits = 0, emu_val = 0, phys_val = 0, val;
+
+    memcpy(&emu_bits, vdev->emulated_config_bits + addr, len);
+    emu_bits = le32_to_cpu(emu_bits);
+
+    if (emu_bits) {
+        emu_val = pci_default_read_config(pdev, addr, len);
+    }
+
+    if (~emu_bits & (0xffffffffU >> (32 - len * 8))) {
+        ssize_t ret;
+
+        ret = pread(vdev->vbasedev.fd, &phys_val, len,
+                    vdev->config_offset + addr);
+        if (ret != len) {
+            error_report("%s(%04x:%02x:%02x.%x, 0x%x, 0x%x) failed: %m",
+                         __func__, vdev->host.domain, vdev->host.bus,
+                         vdev->host.slot, vdev->host.function, addr, len);
+            return -errno;
+        }
+        phys_val = le32_to_cpu(phys_val);
+    }
+
+    val = (emu_val & emu_bits) | (phys_val & ~emu_bits);
+
+    trace_vfio_pci_read_config(vdev->vbasedev.name, addr, len, val);
+
+    return val;
+}
+
+static void vfio_pci_write_config(PCIDevice *pdev, uint32_t addr,
+                                  uint32_t val, int len)
+{
+    VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev);
+    uint32_t val_le = cpu_to_le32(val);
+
+    trace_vfio_pci_write_config(vdev->vbasedev.name, addr, val, len);
+
+    /* Write everything to VFIO, let it filter out what we can't write */
+    if (pwrite(vdev->vbasedev.fd, &val_le, len, vdev->config_offset + addr)
+                != len) {
+        error_report("%s(%04x:%02x:%02x.%x, 0x%x, 0x%x, 0x%x) failed: %m",
+                     __func__, vdev->host.domain, vdev->host.bus,
+                     vdev->host.slot, vdev->host.function, addr, val, len);
+    }
+
+    /* MSI/MSI-X Enabling/Disabling */
+    if (pdev->cap_present & QEMU_PCI_CAP_MSI &&
+        ranges_overlap(addr, len, pdev->msi_cap, vdev->msi_cap_size)) {
+        int is_enabled, was_enabled = msi_enabled(pdev);
+
+        pci_default_write_config(pdev, addr, val, len);
+
+        is_enabled = msi_enabled(pdev);
+
+        if (!was_enabled) {
+            if (is_enabled) {
+                vfio_enable_msi(vdev);
+            }
+        } else {
+            if (!is_enabled) {
+                vfio_disable_msi(vdev);
+            } else {
+                vfio_update_msi(vdev);
+            }
+        }
+    } else if (pdev->cap_present & QEMU_PCI_CAP_MSIX &&
+        ranges_overlap(addr, len, pdev->msix_cap, MSIX_CAP_LENGTH)) {
+        int is_enabled, was_enabled = msix_enabled(pdev);
+
+        pci_default_write_config(pdev, addr, val, len);
+
+        is_enabled = msix_enabled(pdev);
+
+        if (!was_enabled && is_enabled) {
+            vfio_enable_msix(vdev);
+        } else if (was_enabled && !is_enabled) {
+            vfio_disable_msix(vdev);
+        }
+    } else {
+        /* Write everything to QEMU to keep emulated bits correct */
+        pci_default_write_config(pdev, addr, val, len);
+    }
+}
+
+/*
+ * Interrupt setup
+ */
+static void vfio_disable_interrupts(VFIOPCIDevice *vdev)
+{
+    /*
+     * More complicated than it looks.  Disabling MSI/X transitions the
+     * device to INTx mode (if supported).  Therefore we need to first
+     * disable MSI/X and then cleanup by disabling INTx.
+     */
+    if (vdev->interrupt == VFIO_INT_MSIX) {
+        vfio_disable_msix(vdev);
+    } else if (vdev->interrupt == VFIO_INT_MSI) {
+        vfio_disable_msi(vdev);
+    }
+
+    if (vdev->interrupt == VFIO_INT_INTx) {
+        vfio_disable_intx(vdev);
+    }
+}
+
+static int vfio_setup_msi(VFIOPCIDevice *vdev, int pos)
+{
+    uint16_t ctrl;
+    bool msi_64bit, msi_maskbit;
+    int ret, entries;
+
+    if (pread(vdev->vbasedev.fd, &ctrl, sizeof(ctrl),
+              vdev->config_offset + pos + PCI_CAP_FLAGS) != sizeof(ctrl)) {
+        return -errno;
+    }
+    ctrl = le16_to_cpu(ctrl);
+
+    msi_64bit = !!(ctrl & PCI_MSI_FLAGS_64BIT);
+    msi_maskbit = !!(ctrl & PCI_MSI_FLAGS_MASKBIT);
+    entries = 1 << ((ctrl & PCI_MSI_FLAGS_QMASK) >> 1);
+
+    trace_vfio_setup_msi(vdev->vbasedev.name, pos);
+
+    ret = msi_init(&vdev->pdev, pos, entries, msi_64bit, msi_maskbit);
+    if (ret < 0) {
+        if (ret == -ENOTSUP) {
+            return 0;
+        }
+        error_report("vfio: msi_init failed");
+        return ret;
+    }
+    vdev->msi_cap_size = 0xa + (msi_maskbit ? 0xa : 0) + (msi_64bit ? 0x4 : 0);
+
+    return 0;
+}
+
+/*
+ * We don't have any control over how pci_add_capability() inserts
+ * capabilities into the chain.  In order to setup MSI-X we need a
+ * MemoryRegion for the BAR.  In order to setup the BAR and not
+ * attempt to mmap the MSI-X table area, which VFIO won't allow, we
+ * need to first look for where the MSI-X table lives.  So we
+ * unfortunately split MSI-X setup across two functions.
+ */
+static int vfio_early_setup_msix(VFIOPCIDevice *vdev)
+{
+    uint8_t pos;
+    uint16_t ctrl;
+    uint32_t table, pba;
+    int fd = vdev->vbasedev.fd;
+
+    pos = pci_find_capability(&vdev->pdev, PCI_CAP_ID_MSIX);
+    if (!pos) {
+        return 0;
+    }
+
+    if (pread(fd, &ctrl, sizeof(ctrl),
+              vdev->config_offset + pos + PCI_CAP_FLAGS) != sizeof(ctrl)) {
+        return -errno;
+    }
+
+    if (pread(fd, &table, sizeof(table),
+              vdev->config_offset + pos + PCI_MSIX_TABLE) != sizeof(table)) {
+        return -errno;
+    }
+
+    if (pread(fd, &pba, sizeof(pba),
+              vdev->config_offset + pos + PCI_MSIX_PBA) != sizeof(pba)) {
+        return -errno;
+    }
+
+    ctrl = le16_to_cpu(ctrl);
+    table = le32_to_cpu(table);
+    pba = le32_to_cpu(pba);
+
+    vdev->msix = g_malloc0(sizeof(*(vdev->msix)));
+    vdev->msix->table_bar = table & PCI_MSIX_FLAGS_BIRMASK;
+    vdev->msix->table_offset = table & ~PCI_MSIX_FLAGS_BIRMASK;
+    vdev->msix->pba_bar = pba & PCI_MSIX_FLAGS_BIRMASK;
+    vdev->msix->pba_offset = pba & ~PCI_MSIX_FLAGS_BIRMASK;
+    vdev->msix->entries = (ctrl & PCI_MSIX_FLAGS_QSIZE) + 1;
+
+    /*
+     * Test the size of the pba_offset variable and catch if it extends outside
+     * of the specified BAR. If it is the case, we need to apply a hardware
+     * specific quirk if the device is known or we have a broken configuration.
+     */
+    if (vdev->msix->pba_offset >=
+        vdev->bars[vdev->msix->pba_bar].region.size) {
+
+        PCIDevice *pdev = &vdev->pdev;
+        uint16_t vendor = pci_get_word(pdev->config + PCI_VENDOR_ID);
+        uint16_t device = pci_get_word(pdev->config + PCI_DEVICE_ID);
+
+        /*
+         * Chelsio T5 Virtual Function devices are encoded as 0x58xx for T5
+         * adapters. The T5 hardware returns an incorrect value of 0x8000 for
+         * the VF PBA offset while the BAR itself is only 8k. The correct value
+         * is 0x1000, so we hard code that here.
+         */
+        if (vendor == PCI_VENDOR_ID_CHELSIO && (device & 0xff00) == 0x5800) {
+            vdev->msix->pba_offset = 0x1000;
+        } else {
+            error_report("vfio: Hardware reports invalid configuration, "
+                         "MSIX PBA outside of specified BAR");
+            return -EINVAL;
+        }
+    }
+
+    trace_vfio_early_setup_msix(vdev->vbasedev.name, pos,
+                                vdev->msix->table_bar,
+                                vdev->msix->table_offset,
+                                vdev->msix->entries);
+
+    return 0;
+}
+
+static int vfio_setup_msix(VFIOPCIDevice *vdev, int pos)
+{
+    int ret;
+
+    ret = msix_init(&vdev->pdev, vdev->msix->entries,
+                    &vdev->bars[vdev->msix->table_bar].region.mem,
+                    vdev->msix->table_bar, vdev->msix->table_offset,
+                    &vdev->bars[vdev->msix->pba_bar].region.mem,
+                    vdev->msix->pba_bar, vdev->msix->pba_offset, pos);
+    if (ret < 0) {
+        if (ret == -ENOTSUP) {
+            return 0;
+        }
+        error_report("vfio: msix_init failed");
+        return ret;
+    }
+
+    return 0;
+}
+
+static void vfio_teardown_msi(VFIOPCIDevice *vdev)
+{
+    msi_uninit(&vdev->pdev);
+
+    if (vdev->msix) {
+        msix_uninit(&vdev->pdev,
+                    &vdev->bars[vdev->msix->table_bar].region.mem,
+                    &vdev->bars[vdev->msix->pba_bar].region.mem);
+    }
+}
+
+/*
+ * Resource setup
+ */
+static void vfio_mmap_set_enabled(VFIOPCIDevice *vdev, bool enabled)
+{
+    int i;
+
+    for (i = 0; i < PCI_ROM_SLOT; i++) {
+        VFIOBAR *bar = &vdev->bars[i];
+
+        if (!bar->region.size) {
+            continue;
+        }
+
+        memory_region_set_enabled(&bar->region.mmap_mem, enabled);
+        if (vdev->msix && vdev->msix->table_bar == i) {
+            memory_region_set_enabled(&vdev->msix->mmap_mem, enabled);
+        }
+    }
+}
+
+static void vfio_unregister_bar(VFIOPCIDevice *vdev, int nr)
+{
+    VFIOBAR *bar = &vdev->bars[nr];
+
+    if (!bar->region.size) {
+        return;
+    }
+
+    vfio_bar_quirk_teardown(vdev, nr);
+
+    memory_region_del_subregion(&bar->region.mem, &bar->region.mmap_mem);
+
+    if (vdev->msix && vdev->msix->table_bar == nr) {
+        memory_region_del_subregion(&bar->region.mem, &vdev->msix->mmap_mem);
+    }
+}
+
+static void vfio_unmap_bar(VFIOPCIDevice *vdev, int nr)
+{
+    VFIOBAR *bar = &vdev->bars[nr];
+
+    if (!bar->region.size) {
+        return;
+    }
+
+    vfio_bar_quirk_free(vdev, nr);
+
+    munmap(bar->region.mmap, memory_region_size(&bar->region.mmap_mem));
+
+    if (vdev->msix && vdev->msix->table_bar == nr) {
+        munmap(vdev->msix->mmap, memory_region_size(&vdev->msix->mmap_mem));
+    }
+}
+
+static void vfio_map_bar(VFIOPCIDevice *vdev, int nr)
+{
+    VFIOBAR *bar = &vdev->bars[nr];
+    uint64_t size = bar->region.size;
+    char name[64];
+    uint32_t pci_bar;
+    uint8_t type;
+    int ret;
+
+    /* Skip both unimplemented BARs and the upper half of 64bit BARS. */
+    if (!size) {
+        return;
+    }
+
+    snprintf(name, sizeof(name), "VFIO %04x:%02x:%02x.%x BAR %d",
+             vdev->host.domain, vdev->host.bus, vdev->host.slot,
+             vdev->host.function, nr);
+
+    /* Determine what type of BAR this is for registration */
+    ret = pread(vdev->vbasedev.fd, &pci_bar, sizeof(pci_bar),
+                vdev->config_offset + PCI_BASE_ADDRESS_0 + (4 * nr));
+    if (ret != sizeof(pci_bar)) {
+        error_report("vfio: Failed to read BAR %d (%m)", nr);
+        return;
+    }
+
+    pci_bar = le32_to_cpu(pci_bar);
+    bar->ioport = (pci_bar & PCI_BASE_ADDRESS_SPACE_IO);
+    bar->mem64 = bar->ioport ? 0 : (pci_bar & PCI_BASE_ADDRESS_MEM_TYPE_64);
+    type = pci_bar & (bar->ioport ? ~PCI_BASE_ADDRESS_IO_MASK :
+                                    ~PCI_BASE_ADDRESS_MEM_MASK);
+
+    /* A "slow" read/write mapping underlies all BARs */
+    memory_region_init_io(&bar->region.mem, OBJECT(vdev), &vfio_region_ops,
+                          bar, name, size);
+    pci_register_bar(&vdev->pdev, nr, type, &bar->region.mem);
+
+    /*
+     * We can't mmap areas overlapping the MSIX vector table, so we
+     * potentially insert a direct-mapped subregion before and after it.
+     */
+    if (vdev->msix && vdev->msix->table_bar == nr) {
+        size = vdev->msix->table_offset & qemu_real_host_page_mask;
+    }
+
+    strncat(name, " mmap", sizeof(name) - strlen(name) - 1);
+    if (vfio_mmap_region(OBJECT(vdev), &bar->region, &bar->region.mem,
+                      &bar->region.mmap_mem, &bar->region.mmap,
+                      size, 0, name)) {
+        error_report("%s unsupported. Performance may be slow", name);
+    }
+
+    if (vdev->msix && vdev->msix->table_bar == nr) {
+        uint64_t start;
+
+        start = REAL_HOST_PAGE_ALIGN((uint64_t)vdev->msix->table_offset +
+                                     (vdev->msix->entries *
+                                      PCI_MSIX_ENTRY_SIZE));
+
+        size = start < bar->region.size ? bar->region.size - start : 0;
+        strncat(name, " msix-hi", sizeof(name) - strlen(name) - 1);
+        /* VFIOMSIXInfo contains another MemoryRegion for this mapping */
+        if (vfio_mmap_region(OBJECT(vdev), &bar->region, &bar->region.mem,
+                          &vdev->msix->mmap_mem,
+                          &vdev->msix->mmap, size, start, name)) {
+            error_report("%s unsupported. Performance may be slow", name);
+        }
+    }
+
+    vfio_bar_quirk_setup(vdev, nr);
+}
+
+static void vfio_map_bars(VFIOPCIDevice *vdev)
+{
+    int i;
+
+    for (i = 0; i < PCI_ROM_SLOT; i++) {
+        vfio_map_bar(vdev, i);
+    }
+
+    if (vdev->has_vga) {
+        memory_region_init_io(&vdev->vga.region[QEMU_PCI_VGA_MEM].mem,
+                              OBJECT(vdev), &vfio_vga_ops,
+                              &vdev->vga.region[QEMU_PCI_VGA_MEM],
+                              "vfio-vga-mmio@0xa0000",
+                              QEMU_PCI_VGA_MEM_SIZE);
+        memory_region_init_io(&vdev->vga.region[QEMU_PCI_VGA_IO_LO].mem,
+                              OBJECT(vdev), &vfio_vga_ops,
+                              &vdev->vga.region[QEMU_PCI_VGA_IO_LO],
+                              "vfio-vga-io@0x3b0",
+                              QEMU_PCI_VGA_IO_LO_SIZE);
+        memory_region_init_io(&vdev->vga.region[QEMU_PCI_VGA_IO_HI].mem,
+                              OBJECT(vdev), &vfio_vga_ops,
+                              &vdev->vga.region[QEMU_PCI_VGA_IO_HI],
+                              "vfio-vga-io@0x3c0",
+                              QEMU_PCI_VGA_IO_HI_SIZE);
+
+        pci_register_vga(&vdev->pdev, &vdev->vga.region[QEMU_PCI_VGA_MEM].mem,
+                         &vdev->vga.region[QEMU_PCI_VGA_IO_LO].mem,
+                         &vdev->vga.region[QEMU_PCI_VGA_IO_HI].mem);
+        vfio_vga_quirk_setup(vdev);
+    }
+}
+
+static void vfio_unregister_bars(VFIOPCIDevice *vdev)
+{
+    int i;
+
+    for (i = 0; i < PCI_ROM_SLOT; i++) {
+        vfio_unregister_bar(vdev, i);
+    }
+
+    if (vdev->has_vga) {
+        vfio_vga_quirk_teardown(vdev);
+        pci_unregister_vga(&vdev->pdev);
+    }
+}
+
+static void vfio_unmap_bars(VFIOPCIDevice *vdev)
+{
+    int i;
+
+    for (i = 0; i < PCI_ROM_SLOT; i++) {
+        vfio_unmap_bar(vdev, i);
+    }
+
+    if (vdev->has_vga) {
+        vfio_vga_quirk_free(vdev);
+    }
+}
+
+/*
+ * General setup
+ */
+static uint8_t vfio_std_cap_max_size(PCIDevice *pdev, uint8_t pos)
+{
+    uint8_t tmp, next = 0xff;
+
+    for (tmp = pdev->config[PCI_CAPABILITY_LIST]; tmp;
+         tmp = pdev->config[tmp + 1]) {
+        if (tmp > pos && tmp < next) {
+            next = tmp;
+        }
+    }
+
+    return next - pos;
+}
+
+static void vfio_set_word_bits(uint8_t *buf, uint16_t val, uint16_t mask)
+{
+    pci_set_word(buf, (pci_get_word(buf) & ~mask) | val);
+}
+
+static void vfio_add_emulated_word(VFIOPCIDevice *vdev, int pos,
+                                   uint16_t val, uint16_t mask)
+{
+    vfio_set_word_bits(vdev->pdev.config + pos, val, mask);
+    vfio_set_word_bits(vdev->pdev.wmask + pos, ~mask, mask);
+    vfio_set_word_bits(vdev->emulated_config_bits + pos, mask, mask);
+}
+
+static void vfio_set_long_bits(uint8_t *buf, uint32_t val, uint32_t mask)
+{
+    pci_set_long(buf, (pci_get_long(buf) & ~mask) | val);
+}
+
+static void vfio_add_emulated_long(VFIOPCIDevice *vdev, int pos,
+                                   uint32_t val, uint32_t mask)
+{
+    vfio_set_long_bits(vdev->pdev.config + pos, val, mask);
+    vfio_set_long_bits(vdev->pdev.wmask + pos, ~mask, mask);
+    vfio_set_long_bits(vdev->emulated_config_bits + pos, mask, mask);
+}
+
+static int vfio_setup_pcie_cap(VFIOPCIDevice *vdev, int pos, uint8_t size)
+{
+    uint16_t flags;
+    uint8_t type;
+
+    flags = pci_get_word(vdev->pdev.config + pos + PCI_CAP_FLAGS);
+    type = (flags & PCI_EXP_FLAGS_TYPE) >> 4;
+
+    if (type != PCI_EXP_TYPE_ENDPOINT &&
+        type != PCI_EXP_TYPE_LEG_END &&
+        type != PCI_EXP_TYPE_RC_END) {
+
+        error_report("vfio: Assignment of PCIe type 0x%x "
+                     "devices is not currently supported", type);
+        return -EINVAL;
+    }
+
+    if (!pci_bus_is_express(vdev->pdev.bus)) {
+        /*
+         * Use express capability as-is on PCI bus.  It doesn't make much
+         * sense to even expose, but some drivers (ex. tg3) depend on it
+         * and guests don't seem to be particular about it.  We'll need
+         * to revist this or force express devices to express buses if we
+         * ever expose an IOMMU to the guest.
+         */
+    } else if (pci_bus_is_root(vdev->pdev.bus)) {
+        /*
+         * On a Root Complex bus Endpoints become Root Complex Integrated
+         * Endpoints, which changes the type and clears the LNK & LNK2 fields.
+         */
+        if (type == PCI_EXP_TYPE_ENDPOINT) {
+            vfio_add_emulated_word(vdev, pos + PCI_CAP_FLAGS,
+                                   PCI_EXP_TYPE_RC_END << 4,
+                                   PCI_EXP_FLAGS_TYPE);
+
+            /* Link Capabilities, Status, and Control goes away */
+            if (size > PCI_EXP_LNKCTL) {
+                vfio_add_emulated_long(vdev, pos + PCI_EXP_LNKCAP, 0, ~0);
+                vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKCTL, 0, ~0);
+                vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKSTA, 0, ~0);
+
+#ifndef PCI_EXP_LNKCAP2
+#define PCI_EXP_LNKCAP2 44
+#endif
+#ifndef PCI_EXP_LNKSTA2
+#define PCI_EXP_LNKSTA2 50
+#endif
+                /* Link 2 Capabilities, Status, and Control goes away */
+                if (size > PCI_EXP_LNKCAP2) {
+                    vfio_add_emulated_long(vdev, pos + PCI_EXP_LNKCAP2, 0, ~0);
+                    vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKCTL2, 0, ~0);
+                    vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKSTA2, 0, ~0);
+                }
+            }
+
+        } else if (type == PCI_EXP_TYPE_LEG_END) {
+            /*
+             * Legacy endpoints don't belong on the root complex.  Windows
+             * seems to be happier with devices if we skip the capability.
+             */
+            return 0;
+        }
+
+    } else {
+        /*
+         * Convert Root Complex Integrated Endpoints to regular endpoints.
+         * These devices don't support LNK/LNK2 capabilities, so make them up.
+         */
+        if (type == PCI_EXP_TYPE_RC_END) {
+            vfio_add_emulated_word(vdev, pos + PCI_CAP_FLAGS,
+                                   PCI_EXP_TYPE_ENDPOINT << 4,
+                                   PCI_EXP_FLAGS_TYPE);
+            vfio_add_emulated_long(vdev, pos + PCI_EXP_LNKCAP,
+                                   PCI_EXP_LNK_MLW_1 | PCI_EXP_LNK_LS_25, ~0);
+            vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKCTL, 0, ~0);
+        }
+
+        /* Mark the Link Status bits as emulated to allow virtual negotiation */
+        vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKSTA,
+                               pci_get_word(vdev->pdev.config + pos +
+                                            PCI_EXP_LNKSTA),
+                               PCI_EXP_LNKCAP_MLW | PCI_EXP_LNKCAP_SLS);
+    }
+
+    pos = pci_add_capability(&vdev->pdev, PCI_CAP_ID_EXP, pos, size);
+    if (pos >= 0) {
+        vdev->pdev.exp.exp_cap = pos;
+    }
+
+    return pos;
+}
+
+static void vfio_check_pcie_flr(VFIOPCIDevice *vdev, uint8_t pos)
+{
+    uint32_t cap = pci_get_long(vdev->pdev.config + pos + PCI_EXP_DEVCAP);
+
+    if (cap & PCI_EXP_DEVCAP_FLR) {
+        trace_vfio_check_pcie_flr(vdev->vbasedev.name);
+        vdev->has_flr = true;
+    }
+}
+
+static void vfio_check_pm_reset(VFIOPCIDevice *vdev, uint8_t pos)
+{
+    uint16_t csr = pci_get_word(vdev->pdev.config + pos + PCI_PM_CTRL);
+
+    if (!(csr & PCI_PM_CTRL_NO_SOFT_RESET)) {
+        trace_vfio_check_pm_reset(vdev->vbasedev.name);
+        vdev->has_pm_reset = true;
+    }
+}
+
+static void vfio_check_af_flr(VFIOPCIDevice *vdev, uint8_t pos)
+{
+    uint8_t cap = pci_get_byte(vdev->pdev.config + pos + PCI_AF_CAP);
+
+    if ((cap & PCI_AF_CAP_TP) && (cap & PCI_AF_CAP_FLR)) {
+        trace_vfio_check_af_flr(vdev->vbasedev.name);
+        vdev->has_flr = true;
+    }
+}
+
+static int vfio_add_std_cap(VFIOPCIDevice *vdev, uint8_t pos)
+{
+    PCIDevice *pdev = &vdev->pdev;
+    uint8_t cap_id, next, size;
+    int ret;
+
+    cap_id = pdev->config[pos];
+    next = pdev->config[pos + 1];
+
+    /*
+     * If it becomes important to configure capabilities to their actual
+     * size, use this as the default when it's something we don't recognize.
+     * Since QEMU doesn't actually handle many of the config accesses,
+     * exact size doesn't seem worthwhile.
+     */
+    size = vfio_std_cap_max_size(pdev, pos);
+
+    /*
+     * pci_add_capability always inserts the new capability at the head
+     * of the chain.  Therefore to end up with a chain that matches the
+     * physical device, we insert from the end by making this recursive.
+     * This is also why we pre-caclulate size above as cached config space
+     * will be changed as we unwind the stack.
+     */
+    if (next) {
+        ret = vfio_add_std_cap(vdev, next);
+        if (ret) {
+            return ret;
+        }
+    } else {
+        /* Begin the rebuild, use QEMU emulated list bits */
+        pdev->config[PCI_CAPABILITY_LIST] = 0;
+        vdev->emulated_config_bits[PCI_CAPABILITY_LIST] = 0xff;
+        vdev->emulated_config_bits[PCI_STATUS] |= PCI_STATUS_CAP_LIST;
+    }
+
+    /* Use emulated next pointer to allow dropping caps */
+    pci_set_byte(vdev->emulated_config_bits + pos + 1, 0xff);
+
+    switch (cap_id) {
+    case PCI_CAP_ID_MSI:
+        ret = vfio_setup_msi(vdev, pos);
+        break;
+    case PCI_CAP_ID_EXP:
+        vfio_check_pcie_flr(vdev, pos);
+        ret = vfio_setup_pcie_cap(vdev, pos, size);
+        break;
+    case PCI_CAP_ID_MSIX:
+        ret = vfio_setup_msix(vdev, pos);
+        break;
+    case PCI_CAP_ID_PM:
+        vfio_check_pm_reset(vdev, pos);
+        vdev->pm_cap = pos;
+        ret = pci_add_capability(pdev, cap_id, pos, size);
+        break;
+    case PCI_CAP_ID_AF:
+        vfio_check_af_flr(vdev, pos);
+        ret = pci_add_capability(pdev, cap_id, pos, size);
+        break;
+    default:
+        ret = pci_add_capability(pdev, cap_id, pos, size);
+        break;
+    }
+
+    if (ret < 0) {
+        error_report("vfio: %04x:%02x:%02x.%x Error adding PCI capability "
+                     "0x%x[0x%x]@0x%x: %d", vdev->host.domain,
+                     vdev->host.bus, vdev->host.slot, vdev->host.function,
+                     cap_id, size, pos, ret);
+        return ret;
+    }
+
+    return 0;
+}
+
+static int vfio_add_capabilities(VFIOPCIDevice *vdev)
+{
+    PCIDevice *pdev = &vdev->pdev;
+
+    if (!(pdev->config[PCI_STATUS] & PCI_STATUS_CAP_LIST) ||
+        !pdev->config[PCI_CAPABILITY_LIST]) {
+        return 0; /* Nothing to add */
+    }
+
+    return vfio_add_std_cap(vdev, pdev->config[PCI_CAPABILITY_LIST]);
+}
+
+static void vfio_pci_pre_reset(VFIOPCIDevice *vdev)
+{
+    PCIDevice *pdev = &vdev->pdev;
+    uint16_t cmd;
+
+    vfio_disable_interrupts(vdev);
+
+    /* Make sure the device is in D0 */
+    if (vdev->pm_cap) {
+        uint16_t pmcsr;
+        uint8_t state;
+
+        pmcsr = vfio_pci_read_config(pdev, vdev->pm_cap + PCI_PM_CTRL, 2);
+        state = pmcsr & PCI_PM_CTRL_STATE_MASK;
+        if (state) {
+            pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
+            vfio_pci_write_config(pdev, vdev->pm_cap + PCI_PM_CTRL, pmcsr, 2);
+            /* vfio handles the necessary delay here */
+            pmcsr = vfio_pci_read_config(pdev, vdev->pm_cap + PCI_PM_CTRL, 2);
+            state = pmcsr & PCI_PM_CTRL_STATE_MASK;
+            if (state) {
+                error_report("vfio: Unable to power on device, stuck in D%d",
+                             state);
+            }
+        }
+    }
+
+    /*
+     * Stop any ongoing DMA by disconecting I/O, MMIO, and bus master.
+     * Also put INTx Disable in known state.
+     */
+    cmd = vfio_pci_read_config(pdev, PCI_COMMAND, 2);
+    cmd &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
+             PCI_COMMAND_INTX_DISABLE);
+    vfio_pci_write_config(pdev, PCI_COMMAND, cmd, 2);
+}
+
+static void vfio_pci_post_reset(VFIOPCIDevice *vdev)
+{
+    vfio_enable_intx(vdev);
+}
+
+static bool vfio_pci_host_match(PCIHostDeviceAddress *host1,
+                                PCIHostDeviceAddress *host2)
+{
+    return (host1->domain == host2->domain && host1->bus == host2->bus &&
+            host1->slot == host2->slot && host1->function == host2->function);
+}
+
+static int vfio_pci_hot_reset(VFIOPCIDevice *vdev, bool single)
+{
+    VFIOGroup *group;
+    struct vfio_pci_hot_reset_info *info;
+    struct vfio_pci_dependent_device *devices;
+    struct vfio_pci_hot_reset *reset;
+    int32_t *fds;
+    int ret, i, count;
+    bool multi = false;
+
+    trace_vfio_pci_hot_reset(vdev->vbasedev.name, single ? "one" : "multi");
+
+    vfio_pci_pre_reset(vdev);
+    vdev->vbasedev.needs_reset = false;
+
+    info = g_malloc0(sizeof(*info));
+    info->argsz = sizeof(*info);
+
+    ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_GET_PCI_HOT_RESET_INFO, info);
+    if (ret && errno != ENOSPC) {
+        ret = -errno;
+        if (!vdev->has_pm_reset) {
+            error_report("vfio: Cannot reset device %04x:%02x:%02x.%x, "
+                         "no available reset mechanism.", vdev->host.domain,
+                         vdev->host.bus, vdev->host.slot, vdev->host.function);
+        }
+        goto out_single;
+    }
+
+    count = info->count;
+    info = g_realloc(info, sizeof(*info) + (count * sizeof(*devices)));
+    info->argsz = sizeof(*info) + (count * sizeof(*devices));
+    devices = &info->devices[0];
+
+    ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_GET_PCI_HOT_RESET_INFO, info);
+    if (ret) {
+        ret = -errno;
+        error_report("vfio: hot reset info failed: %m");
+        goto out_single;
+    }
+
+    trace_vfio_pci_hot_reset_has_dep_devices(vdev->vbasedev.name);
+
+    /* Verify that we have all the groups required */
+    for (i = 0; i < info->count; i++) {
+        PCIHostDeviceAddress host;
+        VFIOPCIDevice *tmp;
+        VFIODevice *vbasedev_iter;
+
+        host.domain = devices[i].segment;
+        host.bus = devices[i].bus;
+        host.slot = PCI_SLOT(devices[i].devfn);
+        host.function = PCI_FUNC(devices[i].devfn);
+
+        trace_vfio_pci_hot_reset_dep_devices(host.domain,
+                host.bus, host.slot, host.function, devices[i].group_id);
+
+        if (vfio_pci_host_match(&host, &vdev->host)) {
+            continue;
+        }
+
+        QLIST_FOREACH(group, &vfio_group_list, next) {
+            if (group->groupid == devices[i].group_id) {
+                break;
+            }
+        }
+
+        if (!group) {
+            if (!vdev->has_pm_reset) {
+                error_report("vfio: Cannot reset device %s, "
+                             "depends on group %d which is not owned.",
+                             vdev->vbasedev.name, devices[i].group_id);
+            }
+            ret = -EPERM;
+            goto out;
+        }
+
+        /* Prep dependent devices for reset and clear our marker. */
+        QLIST_FOREACH(vbasedev_iter, &group->device_list, next) {
+            if (vbasedev_iter->type != VFIO_DEVICE_TYPE_PCI) {
+                continue;
+            }
+            tmp = container_of(vbasedev_iter, VFIOPCIDevice, vbasedev);
+            if (vfio_pci_host_match(&host, &tmp->host)) {
+                if (single) {
+                    ret = -EINVAL;
+                    goto out_single;
+                }
+                vfio_pci_pre_reset(tmp);
+                tmp->vbasedev.needs_reset = false;
+                multi = true;
+                break;
+            }
+        }
+    }
+
+    if (!single && !multi) {
+        ret = -EINVAL;
+        goto out_single;
+    }
+
+    /* Determine how many group fds need to be passed */
+    count = 0;
+    QLIST_FOREACH(group, &vfio_group_list, next) {
+        for (i = 0; i < info->count; i++) {
+            if (group->groupid == devices[i].group_id) {
+                count++;
+                break;
+            }
+        }
+    }
+
+    reset = g_malloc0(sizeof(*reset) + (count * sizeof(*fds)));
+    reset->argsz = sizeof(*reset) + (count * sizeof(*fds));
+    fds = &reset->group_fds[0];
+
+    /* Fill in group fds */
+    QLIST_FOREACH(group, &vfio_group_list, next) {
+        for (i = 0; i < info->count; i++) {
+            if (group->groupid == devices[i].group_id) {
+                fds[reset->count++] = group->fd;
+                break;
+            }
+        }
+    }
+
+    /* Bus reset! */
+    ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_PCI_HOT_RESET, reset);
+    g_free(reset);
+
+    trace_vfio_pci_hot_reset_result(vdev->vbasedev.name,
+                                    ret ? "%m" : "Success");
+
+out:
+    /* Re-enable INTx on affected devices */
+    for (i = 0; i < info->count; i++) {
+        PCIHostDeviceAddress host;
+        VFIOPCIDevice *tmp;
+        VFIODevice *vbasedev_iter;
+
+        host.domain = devices[i].segment;
+        host.bus = devices[i].bus;
+        host.slot = PCI_SLOT(devices[i].devfn);
+        host.function = PCI_FUNC(devices[i].devfn);
+
+        if (vfio_pci_host_match(&host, &vdev->host)) {
+            continue;
+        }
+
+        QLIST_FOREACH(group, &vfio_group_list, next) {
+            if (group->groupid == devices[i].group_id) {
+                break;
+            }
+        }
+
+        if (!group) {
+            break;
+        }
+
+        QLIST_FOREACH(vbasedev_iter, &group->device_list, next) {
+            if (vbasedev_iter->type != VFIO_DEVICE_TYPE_PCI) {
+                continue;
+            }
+            tmp = container_of(vbasedev_iter, VFIOPCIDevice, vbasedev);
+            if (vfio_pci_host_match(&host, &tmp->host)) {
+                vfio_pci_post_reset(tmp);
+                break;
+            }
+        }
+    }
+out_single:
+    vfio_pci_post_reset(vdev);
+    g_free(info);
+
+    return ret;
+}
+
+/*
+ * We want to differentiate hot reset of mulitple in-use devices vs hot reset
+ * of a single in-use device.  VFIO_DEVICE_RESET will already handle the case
+ * of doing hot resets when there is only a single device per bus.  The in-use
+ * here refers to how many VFIODevices are affected.  A hot reset that affects
+ * multiple devices, but only a single in-use device, means that we can call
+ * it from our bus ->reset() callback since the extent is effectively a single
+ * device.  This allows us to make use of it in the hotplug path.  When there
+ * are multiple in-use devices, we can only trigger the hot reset during a
+ * system reset and thus from our reset handler.  We separate _one vs _multi
+ * here so that we don't overlap and do a double reset on the system reset
+ * path where both our reset handler and ->reset() callback are used.  Calling
+ * _one() will only do a hot reset for the one in-use devices case, calling
+ * _multi() will do nothing if a _one() would have been sufficient.
+ */
+static int vfio_pci_hot_reset_one(VFIOPCIDevice *vdev)
+{
+    return vfio_pci_hot_reset(vdev, true);
+}
+
+static int vfio_pci_hot_reset_multi(VFIODevice *vbasedev)
+{
+    VFIOPCIDevice *vdev = container_of(vbasedev, VFIOPCIDevice, vbasedev);
+    return vfio_pci_hot_reset(vdev, false);
+}
+
+static void vfio_pci_compute_needs_reset(VFIODevice *vbasedev)
+{
+    VFIOPCIDevice *vdev = container_of(vbasedev, VFIOPCIDevice, vbasedev);
+    if (!vbasedev->reset_works || (!vdev->has_flr && vdev->has_pm_reset)) {
+        vbasedev->needs_reset = true;
+    }
+}
+
+static VFIODeviceOps vfio_pci_ops = {
+    .vfio_compute_needs_reset = vfio_pci_compute_needs_reset,
+    .vfio_hot_reset_multi = vfio_pci_hot_reset_multi,
+    .vfio_eoi = vfio_eoi,
+};
+
+static int vfio_populate_device(VFIOPCIDevice *vdev)
+{
+    VFIODevice *vbasedev = &vdev->vbasedev;
+    struct vfio_region_info reg_info = { .argsz = sizeof(reg_info) };
+    struct vfio_irq_info irq_info = { .argsz = sizeof(irq_info) };
+    int i, ret = -1;
+
+    /* Sanity check device */
+    if (!(vbasedev->flags & VFIO_DEVICE_FLAGS_PCI)) {
+        error_report("vfio: Um, this isn't a PCI device");
+        goto error;
+    }
+
+    if (vbasedev->num_regions < VFIO_PCI_CONFIG_REGION_INDEX + 1) {
+        error_report("vfio: unexpected number of io regions %u",
+                     vbasedev->num_regions);
+        goto error;
+    }
+
+    if (vbasedev->num_irqs < VFIO_PCI_MSIX_IRQ_INDEX + 1) {
+        error_report("vfio: unexpected number of irqs %u", vbasedev->num_irqs);
+        goto error;
+    }
+
+    for (i = VFIO_PCI_BAR0_REGION_INDEX; i < VFIO_PCI_ROM_REGION_INDEX; i++) {
+        reg_info.index = i;
+
+        ret = ioctl(vbasedev->fd, VFIO_DEVICE_GET_REGION_INFO, &reg_info);
+        if (ret) {
+            error_report("vfio: Error getting region %d info: %m", i);
+            goto error;
+        }
+
+        trace_vfio_populate_device_region(vbasedev->name, i,
+                                          (unsigned long)reg_info.size,
+                                          (unsigned long)reg_info.offset,
+                                          (unsigned long)reg_info.flags);
+
+        vdev->bars[i].region.vbasedev = vbasedev;
+        vdev->bars[i].region.flags = reg_info.flags;
+        vdev->bars[i].region.size = reg_info.size;
+        vdev->bars[i].region.fd_offset = reg_info.offset;
+        vdev->bars[i].region.nr = i;
+        QLIST_INIT(&vdev->bars[i].quirks);
+    }
+
+    reg_info.index = VFIO_PCI_CONFIG_REGION_INDEX;
+
+    ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_GET_REGION_INFO, &reg_info);
+    if (ret) {
+        error_report("vfio: Error getting config info: %m");
+        goto error;
+    }
+
+    trace_vfio_populate_device_config(vdev->vbasedev.name,
+                                      (unsigned long)reg_info.size,
+                                      (unsigned long)reg_info.offset,
+                                      (unsigned long)reg_info.flags);
+
+    vdev->config_size = reg_info.size;
+    if (vdev->config_size == PCI_CONFIG_SPACE_SIZE) {
+        vdev->pdev.cap_present &= ~QEMU_PCI_CAP_EXPRESS;
+    }
+    vdev->config_offset = reg_info.offset;
+
+    if ((vdev->features & VFIO_FEATURE_ENABLE_VGA) &&
+        vbasedev->num_regions > VFIO_PCI_VGA_REGION_INDEX) {
+        struct vfio_region_info vga_info = {
+            .argsz = sizeof(vga_info),
+            .index = VFIO_PCI_VGA_REGION_INDEX,
+         };
+
+        ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_GET_REGION_INFO, &vga_info);
+        if (ret) {
+            error_report(
+                "vfio: Device does not support requested feature x-vga");
+            goto error;
+        }
+
+        if (!(vga_info.flags & VFIO_REGION_INFO_FLAG_READ) ||
+            !(vga_info.flags & VFIO_REGION_INFO_FLAG_WRITE) ||
+            vga_info.size < 0xbffff + 1) {
+            error_report("vfio: Unexpected VGA info, flags 0x%lx, size 0x%lx",
+                         (unsigned long)vga_info.flags,
+                         (unsigned long)vga_info.size);
+            goto error;
+        }
+
+        vdev->vga.fd_offset = vga_info.offset;
+        vdev->vga.fd = vdev->vbasedev.fd;
+
+        vdev->vga.region[QEMU_PCI_VGA_MEM].offset = QEMU_PCI_VGA_MEM_BASE;
+        vdev->vga.region[QEMU_PCI_VGA_MEM].nr = QEMU_PCI_VGA_MEM;
+        QLIST_INIT(&vdev->vga.region[QEMU_PCI_VGA_MEM].quirks);
+
+        vdev->vga.region[QEMU_PCI_VGA_IO_LO].offset = QEMU_PCI_VGA_IO_LO_BASE;
+        vdev->vga.region[QEMU_PCI_VGA_IO_LO].nr = QEMU_PCI_VGA_IO_LO;
+        QLIST_INIT(&vdev->vga.region[QEMU_PCI_VGA_IO_LO].quirks);
+
+        vdev->vga.region[QEMU_PCI_VGA_IO_HI].offset = QEMU_PCI_VGA_IO_HI_BASE;
+        vdev->vga.region[QEMU_PCI_VGA_IO_HI].nr = QEMU_PCI_VGA_IO_HI;
+        QLIST_INIT(&vdev->vga.region[QEMU_PCI_VGA_IO_HI].quirks);
+
+        vdev->has_vga = true;
+    }
+
+    irq_info.index = VFIO_PCI_ERR_IRQ_INDEX;
+
+    ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_GET_IRQ_INFO, &irq_info);
+    if (ret) {
+        /* This can fail for an old kernel or legacy PCI dev */
+        trace_vfio_populate_device_get_irq_info_failure();
+        ret = 0;
+    } else if (irq_info.count == 1) {
+        vdev->pci_aer = true;
+    } else {
+        error_report("vfio: %s "
+                     "Could not enable error recovery for the device",
+                     vbasedev->name);
+    }
+
+error:
+    return ret;
+}
+
+static void vfio_put_device(VFIOPCIDevice *vdev)
+{
+    g_free(vdev->vbasedev.name);
+    if (vdev->msix) {
+        object_unparent(OBJECT(&vdev->msix->mmap_mem));
+        g_free(vdev->msix);
+        vdev->msix = NULL;
+    }
+    vfio_put_base_device(&vdev->vbasedev);
+}
+
+static void vfio_err_notifier_handler(void *opaque)
+{
+    VFIOPCIDevice *vdev = opaque;
+
+    if (!event_notifier_test_and_clear(&vdev->err_notifier)) {
+        return;
+    }
+
+    /*
+     * TBD. Retrieve the error details and decide what action
+     * needs to be taken. One of the actions could be to pass
+     * the error to the guest and have the guest driver recover
+     * from the error. This requires that PCIe capabilities be
+     * exposed to the guest. For now, we just terminate the
+     * guest to contain the error.
+     */
+
+    error_report("%s(%04x:%02x:%02x.%x) Unrecoverable error detected.  "
+                 "Please collect any data possible and then kill the guest",
+                 __func__, vdev->host.domain, vdev->host.bus,
+                 vdev->host.slot, vdev->host.function);
+
+    vm_stop(RUN_STATE_INTERNAL_ERROR);
+}
+
+/*
+ * Registers error notifier for devices supporting error recovery.
+ * If we encounter a failure in this function, we report an error
+ * and continue after disabling error recovery support for the
+ * device.
+ */
+static void vfio_register_err_notifier(VFIOPCIDevice *vdev)
+{
+    int ret;
+    int argsz;
+    struct vfio_irq_set *irq_set;
+    int32_t *pfd;
+
+    if (!vdev->pci_aer) {
+        return;
+    }
+
+    if (event_notifier_init(&vdev->err_notifier, 0)) {
+        error_report("vfio: Unable to init event notifier for error detection");
+        vdev->pci_aer = false;
+        return;
+    }
+
+    argsz = sizeof(*irq_set) + sizeof(*pfd);
+
+    irq_set = g_malloc0(argsz);
+    irq_set->argsz = argsz;
+    irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD |
+                     VFIO_IRQ_SET_ACTION_TRIGGER;
+    irq_set->index = VFIO_PCI_ERR_IRQ_INDEX;
+    irq_set->start = 0;
+    irq_set->count = 1;
+    pfd = (int32_t *)&irq_set->data;
+
+    *pfd = event_notifier_get_fd(&vdev->err_notifier);
+    qemu_set_fd_handler(*pfd, vfio_err_notifier_handler, NULL, vdev);
+
+    ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_SET_IRQS, irq_set);
+    if (ret) {
+        error_report("vfio: Failed to set up error notification");
+        qemu_set_fd_handler(*pfd, NULL, NULL, vdev);
+        event_notifier_cleanup(&vdev->err_notifier);
+        vdev->pci_aer = false;
+    }
+    g_free(irq_set);
+}
+
+static void vfio_unregister_err_notifier(VFIOPCIDevice *vdev)
+{
+    int argsz;
+    struct vfio_irq_set *irq_set;
+    int32_t *pfd;
+    int ret;
+
+    if (!vdev->pci_aer) {
+        return;
+    }
+
+    argsz = sizeof(*irq_set) + sizeof(*pfd);
+
+    irq_set = g_malloc0(argsz);
+    irq_set->argsz = argsz;
+    irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD |
+                     VFIO_IRQ_SET_ACTION_TRIGGER;
+    irq_set->index = VFIO_PCI_ERR_IRQ_INDEX;
+    irq_set->start = 0;
+    irq_set->count = 1;
+    pfd = (int32_t *)&irq_set->data;
+    *pfd = -1;
+
+    ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_SET_IRQS, irq_set);
+    if (ret) {
+        error_report("vfio: Failed to de-assign error fd: %m");
+    }
+    g_free(irq_set);
+    qemu_set_fd_handler(event_notifier_get_fd(&vdev->err_notifier),
+                        NULL, NULL, vdev);
+    event_notifier_cleanup(&vdev->err_notifier);
+}
+
+static void vfio_req_notifier_handler(void *opaque)
+{
+    VFIOPCIDevice *vdev = opaque;
+
+    if (!event_notifier_test_and_clear(&vdev->req_notifier)) {
+        return;
+    }
+
+    qdev_unplug(&vdev->pdev.qdev, NULL);
+}
+
+static void vfio_register_req_notifier(VFIOPCIDevice *vdev)
+{
+    struct vfio_irq_info irq_info = { .argsz = sizeof(irq_info),
+                                      .index = VFIO_PCI_REQ_IRQ_INDEX };
+    int argsz;
+    struct vfio_irq_set *irq_set;
+    int32_t *pfd;
+
+    if (!(vdev->features & VFIO_FEATURE_ENABLE_REQ)) {
+        return;
+    }
+
+    if (ioctl(vdev->vbasedev.fd,
+              VFIO_DEVICE_GET_IRQ_INFO, &irq_info) < 0 || irq_info.count < 1) {
+        return;
+    }
+
+    if (event_notifier_init(&vdev->req_notifier, 0)) {
+        error_report("vfio: Unable to init event notifier for device request");
+        return;
+    }
+
+    argsz = sizeof(*irq_set) + sizeof(*pfd);
+
+    irq_set = g_malloc0(argsz);
+    irq_set->argsz = argsz;
+    irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD |
+                     VFIO_IRQ_SET_ACTION_TRIGGER;
+    irq_set->index = VFIO_PCI_REQ_IRQ_INDEX;
+    irq_set->start = 0;
+    irq_set->count = 1;
+    pfd = (int32_t *)&irq_set->data;
+
+    *pfd = event_notifier_get_fd(&vdev->req_notifier);
+    qemu_set_fd_handler(*pfd, vfio_req_notifier_handler, NULL, vdev);
+
+    if (ioctl(vdev->vbasedev.fd, VFIO_DEVICE_SET_IRQS, irq_set)) {
+        error_report("vfio: Failed to set up device request notification");
+        qemu_set_fd_handler(*pfd, NULL, NULL, vdev);
+        event_notifier_cleanup(&vdev->req_notifier);
+    } else {
+        vdev->req_enabled = true;
+    }
+
+    g_free(irq_set);
+}
+
+static void vfio_unregister_req_notifier(VFIOPCIDevice *vdev)
+{
+    int argsz;
+    struct vfio_irq_set *irq_set;
+    int32_t *pfd;
+
+    if (!vdev->req_enabled) {
+        return;
+    }
+
+    argsz = sizeof(*irq_set) + sizeof(*pfd);
+
+    irq_set = g_malloc0(argsz);
+    irq_set->argsz = argsz;
+    irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD |
+                     VFIO_IRQ_SET_ACTION_TRIGGER;
+    irq_set->index = VFIO_PCI_REQ_IRQ_INDEX;
+    irq_set->start = 0;
+    irq_set->count = 1;
+    pfd = (int32_t *)&irq_set->data;
+    *pfd = -1;
+
+    if (ioctl(vdev->vbasedev.fd, VFIO_DEVICE_SET_IRQS, irq_set)) {
+        error_report("vfio: Failed to de-assign device request fd: %m");
+    }
+    g_free(irq_set);
+    qemu_set_fd_handler(event_notifier_get_fd(&vdev->req_notifier),
+                        NULL, NULL, vdev);
+    event_notifier_cleanup(&vdev->req_notifier);
+
+    vdev->req_enabled = false;
+}
+
+/*
+ * AMD Radeon PCI config reset, based on Linux:
+ *   drivers/gpu/drm/radeon/ci_smc.c:ci_is_smc_running()
+ *   drivers/gpu/drm/radeon/radeon_device.c:radeon_pci_config_reset
+ *   drivers/gpu/drm/radeon/ci_smc.c:ci_reset_smc()
+ *   drivers/gpu/drm/radeon/ci_smc.c:ci_stop_smc_clock()
+ * IDs: include/drm/drm_pciids.h
+ * Registers: http://cgit.freedesktop.org/~agd5f/linux/commit/?id=4e2aa447f6f0
+ *
+ * Bonaire and Hawaii GPUs do not respond to a bus reset.  This is a bug in the
+ * hardware that should be fixed on future ASICs.  The symptom of this is that
+ * once the accerlated driver loads, Windows guests will bsod on subsequent
+ * attmpts to load the driver, such as after VM reset or shutdown/restart.  To
+ * work around this, we do an AMD specific PCI config reset, followed by an SMC
+ * reset.  The PCI config reset only works if SMC firmware is running, so we
+ * have a dependency on the state of the device as to whether this reset will
+ * be effective.  There are still cases where we won't be able to kick the
+ * device into working, but this greatly improves the usability overall.  The
+ * config reset magic is relatively common on AMD GPUs, but the setup and SMC
+ * poking is largely ASIC specific.
+ */
+static bool vfio_radeon_smc_is_running(VFIOPCIDevice *vdev)
+{
+    uint32_t clk, pc_c;
+
+    /*
+     * Registers 200h and 204h are index and data registers for acessing
+     * indirect configuration registers within the device.
+     */
+    vfio_region_write(&vdev->bars[5].region, 0x200, 0x80000004, 4);
+    clk = vfio_region_read(&vdev->bars[5].region, 0x204, 4);
+    vfio_region_write(&vdev->bars[5].region, 0x200, 0x80000370, 4);
+    pc_c = vfio_region_read(&vdev->bars[5].region, 0x204, 4);
+
+    return (!(clk & 1) && (0x20100 <= pc_c));
+}
+
+/*
+ * The scope of a config reset is controlled by a mode bit in the misc register
+ * and a fuse, exposed as a bit in another register.  The fuse is the default
+ * (0 = GFX, 1 = whole GPU), the misc bit is a toggle, with the forumula
+ * scope = !(misc ^ fuse), where the resulting scope is defined the same as
+ * the fuse.  A truth table therefore tells us that if misc == fuse, we need
+ * to flip the value of the bit in the misc register.
+ */
+static void vfio_radeon_set_gfx_only_reset(VFIOPCIDevice *vdev)
+{
+    uint32_t misc, fuse;
+    bool a, b;
+
+    vfio_region_write(&vdev->bars[5].region, 0x200, 0xc00c0000, 4);
+    fuse = vfio_region_read(&vdev->bars[5].region, 0x204, 4);
+    b = fuse & 64;
+
+    vfio_region_write(&vdev->bars[5].region, 0x200, 0xc0000010, 4);
+    misc = vfio_region_read(&vdev->bars[5].region, 0x204, 4);
+    a = misc & 2;
+
+    if (a == b) {
+        vfio_region_write(&vdev->bars[5].region, 0x204, misc ^ 2, 4);
+        vfio_region_read(&vdev->bars[5].region, 0x204, 4); /* flush */
+    }
+}
+
+static int vfio_radeon_reset(VFIOPCIDevice *vdev)
+{
+    PCIDevice *pdev = &vdev->pdev;
+    int i, ret = 0;
+    uint32_t data;
+
+    /* Defer to a kernel implemented reset */
+    if (vdev->vbasedev.reset_works) {
+        return -ENODEV;
+    }
+
+    /* Enable only memory BAR access */
+    vfio_pci_write_config(pdev, PCI_COMMAND, PCI_COMMAND_MEMORY, 2);
+
+    /* Reset only works if SMC firmware is loaded and running */
+    if (!vfio_radeon_smc_is_running(vdev)) {
+        ret = -EINVAL;
+        goto out;
+    }
+
+    /* Make sure only the GFX function is reset */
+    vfio_radeon_set_gfx_only_reset(vdev);
+
+    /* AMD PCI config reset */
+    vfio_pci_write_config(pdev, 0x7c, 0x39d5e86b, 4);
+    usleep(100);
+
+    /* Read back the memory size to make sure we're out of reset */
+    for (i = 0; i < 100000; i++) {
+        if (vfio_region_read(&vdev->bars[5].region, 0x5428, 4) != 0xffffffff) {
+            break;
+        }
+        usleep(1);
+    }
+
+    /* Reset SMC */
+    vfio_region_write(&vdev->bars[5].region, 0x200, 0x80000000, 4);
+    data = vfio_region_read(&vdev->bars[5].region, 0x204, 4);
+    data |= 1;
+    vfio_region_write(&vdev->bars[5].region, 0x204, data, 4);
+
+    /* Disable SMC clock */
+    vfio_region_write(&vdev->bars[5].region, 0x200, 0x80000004, 4);
+    data = vfio_region_read(&vdev->bars[5].region, 0x204, 4);
+    data |= 1;
+    vfio_region_write(&vdev->bars[5].region, 0x204, data, 4);
+
+out:
+    /* Restore PCI command register */
+    vfio_pci_write_config(pdev, PCI_COMMAND, 0, 2);
+
+    return ret;
+}
+
+static void vfio_setup_resetfn(VFIOPCIDevice *vdev)
+{
+    PCIDevice *pdev = &vdev->pdev;
+    uint16_t vendor, device;
+
+    vendor = pci_get_word(pdev->config + PCI_VENDOR_ID);
+    device = pci_get_word(pdev->config + PCI_DEVICE_ID);
+
+    switch (vendor) {
+    case 0x1002:
+        switch (device) {
+        /* Bonaire */
+        case 0x6649: /* Bonaire [FirePro W5100] */
+        case 0x6650:
+        case 0x6651:
+        case 0x6658: /* Bonaire XTX [Radeon R7 260X] */
+        case 0x665c: /* Bonaire XT [Radeon HD 7790/8770 / R9 260 OEM] */
+        case 0x665d: /* Bonaire [Radeon R7 200 Series] */
+        /* Hawaii */
+        case 0x67A0: /* Hawaii XT GL [FirePro W9100] */
+        case 0x67A1: /* Hawaii PRO GL [FirePro W8100] */
+        case 0x67A2:
+        case 0x67A8:
+        case 0x67A9:
+        case 0x67AA:
+        case 0x67B0: /* Hawaii XT [Radeon R9 290X] */
+        case 0x67B1: /* Hawaii PRO [Radeon R9 290] */
+        case 0x67B8:
+        case 0x67B9:
+        case 0x67BA:
+        case 0x67BE:
+            vdev->resetfn = vfio_radeon_reset;
+            break;
+        }
+        break;
+    }
+}
+
+static int vfio_initfn(PCIDevice *pdev)
+{
+    VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev);
+    VFIODevice *vbasedev_iter;
+    VFIOGroup *group;
+    char path[PATH_MAX], iommu_group_path[PATH_MAX], *group_name;
+    ssize_t len;
+    struct stat st;
+    int groupid;
+    int ret;
+
+    /* Check that the host device exists */
+    snprintf(path, sizeof(path),
+             "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/",
+             vdev->host.domain, vdev->host.bus, vdev->host.slot,
+             vdev->host.function);
+    if (stat(path, &st) < 0) {
+        error_report("vfio: error: no such host device: %s", path);
+        return -errno;
+    }
+
+    vdev->vbasedev.ops = &vfio_pci_ops;
+
+    vdev->vbasedev.type = VFIO_DEVICE_TYPE_PCI;
+    vdev->vbasedev.name = g_strdup_printf("%04x:%02x:%02x.%01x",
+                                          vdev->host.domain, vdev->host.bus,
+                                          vdev->host.slot, vdev->host.function);
+
+    strncat(path, "iommu_group", sizeof(path) - strlen(path) - 1);
+
+    len = readlink(path, iommu_group_path, sizeof(path));
+    if (len <= 0 || len >= sizeof(path)) {
+        error_report("vfio: error no iommu_group for device");
+        return len < 0 ? -errno : -ENAMETOOLONG;
+    }
+
+    iommu_group_path[len] = 0;
+    group_name = basename(iommu_group_path);
+
+    if (sscanf(group_name, "%d", &groupid) != 1) {
+        error_report("vfio: error reading %s: %m", path);
+        return -errno;
+    }
+
+    trace_vfio_initfn(vdev->vbasedev.name, groupid);
+
+    group = vfio_get_group(groupid, pci_device_iommu_address_space(pdev));
+    if (!group) {
+        error_report("vfio: failed to get group %d", groupid);
+        return -ENOENT;
+    }
+
+    snprintf(path, sizeof(path), "%04x:%02x:%02x.%01x",
+            vdev->host.domain, vdev->host.bus, vdev->host.slot,
+            vdev->host.function);
+
+    QLIST_FOREACH(vbasedev_iter, &group->device_list, next) {
+        if (strcmp(vbasedev_iter->name, vdev->vbasedev.name) == 0) {
+            error_report("vfio: error: device %s is already attached", path);
+            vfio_put_group(group);
+            return -EBUSY;
+        }
+    }
+
+    ret = vfio_get_device(group, path, &vdev->vbasedev);
+    if (ret) {
+        error_report("vfio: failed to get device %s", path);
+        vfio_put_group(group);
+        return ret;
+    }
+
+    ret = vfio_populate_device(vdev);
+    if (ret) {
+        return ret;
+    }
+
+    /* Get a copy of config space */
+    ret = pread(vdev->vbasedev.fd, vdev->pdev.config,
+                MIN(pci_config_size(&vdev->pdev), vdev->config_size),
+                vdev->config_offset);
+    if (ret < (int)MIN(pci_config_size(&vdev->pdev), vdev->config_size)) {
+        ret = ret < 0 ? -errno : -EFAULT;
+        error_report("vfio: Failed to read device config space");
+        return ret;
+    }
+
+    /* vfio emulates a lot for us, but some bits need extra love */
+    vdev->emulated_config_bits = g_malloc0(vdev->config_size);
+
+    /* QEMU can choose to expose the ROM or not */
+    memset(vdev->emulated_config_bits + PCI_ROM_ADDRESS, 0xff, 4);
+
+    /* QEMU can change multi-function devices to single function, or reverse */
+    vdev->emulated_config_bits[PCI_HEADER_TYPE] =
+                                              PCI_HEADER_TYPE_MULTI_FUNCTION;
+
+    /* Restore or clear multifunction, this is always controlled by QEMU */
+    if (vdev->pdev.cap_present & QEMU_PCI_CAP_MULTIFUNCTION) {
+        vdev->pdev.config[PCI_HEADER_TYPE] |= PCI_HEADER_TYPE_MULTI_FUNCTION;
+    } else {
+        vdev->pdev.config[PCI_HEADER_TYPE] &= ~PCI_HEADER_TYPE_MULTI_FUNCTION;
+    }
+
+    /*
+     * Clear host resource mapping info.  If we choose not to register a
+     * BAR, such as might be the case with the option ROM, we can get
+     * confusing, unwritable, residual addresses from the host here.
+     */
+    memset(&vdev->pdev.config[PCI_BASE_ADDRESS_0], 0, 24);
+    memset(&vdev->pdev.config[PCI_ROM_ADDRESS], 0, 4);
+
+    vfio_pci_size_rom(vdev);
+
+    ret = vfio_early_setup_msix(vdev);
+    if (ret) {
+        return ret;
+    }
+
+    vfio_map_bars(vdev);
+
+    ret = vfio_add_capabilities(vdev);
+    if (ret) {
+        goto out_teardown;
+    }
+
+    /* QEMU emulates all of MSI & MSIX */
+    if (pdev->cap_present & QEMU_PCI_CAP_MSIX) {
+        memset(vdev->emulated_config_bits + pdev->msix_cap, 0xff,
+               MSIX_CAP_LENGTH);
+    }
+
+    if (pdev->cap_present & QEMU_PCI_CAP_MSI) {
+        memset(vdev->emulated_config_bits + pdev->msi_cap, 0xff,
+               vdev->msi_cap_size);
+    }
+
+    if (vfio_pci_read_config(&vdev->pdev, PCI_INTERRUPT_PIN, 1)) {
+        vdev->intx.mmap_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL,
+                                                  vfio_intx_mmap_enable, vdev);
+        pci_device_set_intx_routing_notifier(&vdev->pdev, vfio_update_irq);
+        ret = vfio_enable_intx(vdev);
+        if (ret) {
+            goto out_teardown;
+        }
+    }
+
+    vfio_register_err_notifier(vdev);
+    vfio_register_req_notifier(vdev);
+    vfio_setup_resetfn(vdev);
+
+    return 0;
+
+out_teardown:
+    pci_device_set_intx_routing_notifier(&vdev->pdev, NULL);
+    vfio_teardown_msi(vdev);
+    vfio_unregister_bars(vdev);
+    return ret;
+}
+
+static void vfio_instance_finalize(Object *obj)
+{
+    PCIDevice *pci_dev = PCI_DEVICE(obj);
+    VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pci_dev);
+    VFIOGroup *group = vdev->vbasedev.group;
+
+    vfio_unmap_bars(vdev);
+    g_free(vdev->emulated_config_bits);
+    g_free(vdev->rom);
+    vfio_put_device(vdev);
+    vfio_put_group(group);
+}
+
+static void vfio_exitfn(PCIDevice *pdev)
+{
+    VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev);
+
+    vfio_unregister_req_notifier(vdev);
+    vfio_unregister_err_notifier(vdev);
+    pci_device_set_intx_routing_notifier(&vdev->pdev, NULL);
+    vfio_disable_interrupts(vdev);
+    if (vdev->intx.mmap_timer) {
+        timer_free(vdev->intx.mmap_timer);
+    }
+    vfio_teardown_msi(vdev);
+    vfio_unregister_bars(vdev);
+}
+
+static void vfio_pci_reset(DeviceState *dev)
+{
+    PCIDevice *pdev = DO_UPCAST(PCIDevice, qdev, dev);
+    VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev);
+
+    trace_vfio_pci_reset(vdev->vbasedev.name);
+
+    vfio_pci_pre_reset(vdev);
+
+    if (vdev->resetfn && !vdev->resetfn(vdev)) {
+        goto post_reset;
+    }
+
+    if (vdev->vbasedev.reset_works &&
+        (vdev->has_flr || !vdev->has_pm_reset) &&
+        !ioctl(vdev->vbasedev.fd, VFIO_DEVICE_RESET)) {
+        trace_vfio_pci_reset_flr(vdev->vbasedev.name);
+        goto post_reset;
+    }
+
+    /* See if we can do our own bus reset */
+    if (!vfio_pci_hot_reset_one(vdev)) {
+        goto post_reset;
+    }
+
+    /* If nothing else works and the device supports PM reset, use it */
+    if (vdev->vbasedev.reset_works && vdev->has_pm_reset &&
+        !ioctl(vdev->vbasedev.fd, VFIO_DEVICE_RESET)) {
+        trace_vfio_pci_reset_pm(vdev->vbasedev.name);
+        goto post_reset;
+    }
+
+post_reset:
+    vfio_pci_post_reset(vdev);
+}
+
+static void vfio_instance_init(Object *obj)
+{
+    PCIDevice *pci_dev = PCI_DEVICE(obj);
+    VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, PCI_DEVICE(obj));
+
+    device_add_bootindex_property(obj, &vdev->bootindex,
+                                  "bootindex", NULL,
+                                  &pci_dev->qdev, NULL);
+}
+
+static Property vfio_pci_dev_properties[] = {
+    DEFINE_PROP_PCI_HOST_DEVADDR("host", VFIOPCIDevice, host),
+    DEFINE_PROP_UINT32("x-intx-mmap-timeout-ms", VFIOPCIDevice,
+                       intx.mmap_timeout, 1100),
+    DEFINE_PROP_BIT("x-vga", VFIOPCIDevice, features,
+                    VFIO_FEATURE_ENABLE_VGA_BIT, false),
+    DEFINE_PROP_BIT("x-req", VFIOPCIDevice, features,
+                    VFIO_FEATURE_ENABLE_REQ_BIT, true),
+    DEFINE_PROP_BOOL("x-mmap", VFIOPCIDevice, vbasedev.allow_mmap, true),
+    /*
+     * TODO - support passed fds... is this necessary?
+     * DEFINE_PROP_STRING("vfiofd", VFIOPCIDevice, vfiofd_name),
+     * DEFINE_PROP_STRING("vfiogroupfd, VFIOPCIDevice, vfiogroupfd_name),
+     */
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static const VMStateDescription vfio_pci_vmstate = {
+    .name = "vfio-pci",
+    .unmigratable = 1,
+};
+
+static void vfio_pci_dev_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    PCIDeviceClass *pdc = PCI_DEVICE_CLASS(klass);
+
+    dc->reset = vfio_pci_reset;
+    dc->props = vfio_pci_dev_properties;
+    dc->vmsd = &vfio_pci_vmstate;
+    dc->desc = "VFIO-based PCI device assignment";
+    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+    pdc->init = vfio_initfn;
+    pdc->exit = vfio_exitfn;
+    pdc->config_read = vfio_pci_read_config;
+    pdc->config_write = vfio_pci_write_config;
+    pdc->is_express = 1; /* We might be */
+}
+
+static const TypeInfo vfio_pci_dev_info = {
+    .name = "vfio-pci",
+    .parent = TYPE_PCI_DEVICE,
+    .instance_size = sizeof(VFIOPCIDevice),
+    .class_init = vfio_pci_dev_class_init,
+    .instance_init = vfio_instance_init,
+    .instance_finalize = vfio_instance_finalize,
+};
+
+static void register_vfio_pci_dev_type(void)
+{
+    type_register_static(&vfio_pci_dev_info);
+}
+
+type_init(register_vfio_pci_dev_type)
diff --git a/qemu/hw/vfio/platform.c b/qemu/hw/vfio/platform.c
new file mode 100644
index 000000000..60365d127
--- /dev/null
+++ b/qemu/hw/vfio/platform.c
@@ -0,0 +1,715 @@
+/*
+ * vfio based device assignment support - platform devices
+ *
+ * Copyright Linaro Limited, 2014
+ *
+ * Authors:
+ *  Kim Phillips <kim.phillips@linaro.org>
+ *  Eric Auger <eric.auger@linaro.org>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ * Based on vfio based PCI device assignment support:
+ *  Copyright Red Hat, Inc. 2012
+ */
+
+#include <sys/ioctl.h>
+#include <linux/vfio.h>
+
+#include "hw/vfio/vfio-platform.h"
+#include "qemu/error-report.h"
+#include "qemu/range.h"
+#include "sysemu/sysemu.h"
+#include "exec/memory.h"
+#include "qemu/queue.h"
+#include "hw/sysbus.h"
+#include "trace.h"
+#include "hw/platform-bus.h"
+#include "sysemu/kvm.h"
+
+/*
+ * Functions used whatever the injection method
+ */
+
+/**
+ * vfio_init_intp - allocate, initialize the IRQ struct pointer
+ * and add it into the list of IRQs
+ * @vbasedev: the VFIO device handle
+ * @info: irq info struct retrieved from VFIO driver
+ */
+static VFIOINTp *vfio_init_intp(VFIODevice *vbasedev,
+                                struct vfio_irq_info info)
+{
+    int ret;
+    VFIOPlatformDevice *vdev =
+        container_of(vbasedev, VFIOPlatformDevice, vbasedev);
+    SysBusDevice *sbdev = SYS_BUS_DEVICE(vdev);
+    VFIOINTp *intp;
+
+    intp = g_malloc0(sizeof(*intp));
+    intp->vdev = vdev;
+    intp->pin = info.index;
+    intp->flags = info.flags;
+    intp->state = VFIO_IRQ_INACTIVE;
+    intp->kvm_accel = false;
+
+    sysbus_init_irq(sbdev, &intp->qemuirq);
+
+    /* Get an eventfd for trigger */
+    ret = event_notifier_init(&intp->interrupt, 0);
+    if (ret) {
+        g_free(intp);
+        error_report("vfio: Error: trigger event_notifier_init failed ");
+        return NULL;
+    }
+    /* Get an eventfd for resample/unmask */
+    ret = event_notifier_init(&intp->unmask, 0);
+    if (ret) {
+        g_free(intp);
+        error_report("vfio: Error: resamplefd event_notifier_init failed");
+        return NULL;
+    }
+
+    QLIST_INSERT_HEAD(&vdev->intp_list, intp, next);
+    return intp;
+}
+
+/**
+ * vfio_set_trigger_eventfd - set VFIO eventfd handling
+ *
+ * @intp: IRQ struct handle
+ * @handler: handler to be called on eventfd signaling
+ *
+ * Setup VFIO signaling and attach an optional user-side handler
+ * to the eventfd
+ */
+static int vfio_set_trigger_eventfd(VFIOINTp *intp,
+                                    eventfd_user_side_handler_t handler)
+{
+    VFIODevice *vbasedev = &intp->vdev->vbasedev;
+    struct vfio_irq_set *irq_set;
+    int argsz, ret;
+    int32_t *pfd;
+
+    argsz = sizeof(*irq_set) + sizeof(*pfd);
+    irq_set = g_malloc0(argsz);
+    irq_set->argsz = argsz;
+    irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
+    irq_set->index = intp->pin;
+    irq_set->start = 0;
+    irq_set->count = 1;
+    pfd = (int32_t *)&irq_set->data;
+    *pfd = event_notifier_get_fd(&intp->interrupt);
+    qemu_set_fd_handler(*pfd, (IOHandler *)handler, NULL, intp);
+    ret = ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, irq_set);
+    g_free(irq_set);
+    if (ret < 0) {
+        error_report("vfio: Failed to set trigger eventfd: %m");
+        qemu_set_fd_handler(*pfd, NULL, NULL, NULL);
+    }
+    return ret;
+}
+
+/*
+ * Functions only used when eventfds are handled on user-side
+ * ie. without irqfd
+ */
+
+/**
+ * vfio_mmap_set_enabled - enable/disable the fast path mode
+ * @vdev: the VFIO platform device
+ * @enabled: the target mmap state
+ *
+ * enabled = true ~ fast path = MMIO region is mmaped (no KVM TRAP);
+ * enabled = false ~ slow path = MMIO region is trapped and region callbacks
+ * are called; slow path enables to trap the device IRQ status register reset
+*/
+
+static void vfio_mmap_set_enabled(VFIOPlatformDevice *vdev, bool enabled)
+{
+    int i;
+
+    trace_vfio_platform_mmap_set_enabled(enabled);
+
+    for (i = 0; i < vdev->vbasedev.num_regions; i++) {
+        VFIORegion *region = vdev->regions[i];
+
+        memory_region_set_enabled(&region->mmap_mem, enabled);
+    }
+}
+
+/**
+ * vfio_intp_mmap_enable - timer function, restores the fast path
+ * if there is no more active IRQ
+ * @opaque: actually points to the VFIO platform device
+ *
+ * Called on mmap timer timout, this function checks whether the
+ * IRQ is still active and if not, restores the fast path.
+ * by construction a single eventfd is handled at a time.
+ * if the IRQ is still active, the timer is re-programmed.
+ */
+static void vfio_intp_mmap_enable(void *opaque)
+{
+    VFIOINTp *tmp;
+    VFIOPlatformDevice *vdev = (VFIOPlatformDevice *)opaque;
+
+    qemu_mutex_lock(&vdev->intp_mutex);
+    QLIST_FOREACH(tmp, &vdev->intp_list, next) {
+        if (tmp->state == VFIO_IRQ_ACTIVE) {
+            trace_vfio_platform_intp_mmap_enable(tmp->pin);
+            /* re-program the timer to check active status later */
+            timer_mod(vdev->mmap_timer,
+                      qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
+                          vdev->mmap_timeout);
+            qemu_mutex_unlock(&vdev->intp_mutex);
+            return;
+        }
+    }
+    vfio_mmap_set_enabled(vdev, true);
+    qemu_mutex_unlock(&vdev->intp_mutex);
+}
+
+/**
+ * vfio_intp_inject_pending_lockheld - Injects a pending IRQ
+ * @opaque: opaque pointer, in practice the VFIOINTp handle
+ *
+ * The function is called on a previous IRQ completion, from
+ * vfio_platform_eoi, while the intp_mutex is locked.
+ * Also in such situation, the slow path already is set and
+ * the mmap timer was already programmed.
+ */
+static void vfio_intp_inject_pending_lockheld(VFIOINTp *intp)
+{
+    trace_vfio_platform_intp_inject_pending_lockheld(intp->pin,
+                              event_notifier_get_fd(&intp->interrupt));
+
+    intp->state = VFIO_IRQ_ACTIVE;
+
+    /* trigger the virtual IRQ */
+    qemu_set_irq(intp->qemuirq, 1);
+}
+
+/**
+ * vfio_intp_interrupt - The user-side eventfd handler
+ * @opaque: opaque pointer which in practice is the VFIOINTp handle
+ *
+ * the function is entered in event handler context:
+ * the vIRQ is injected into the guest if there is no other active
+ * or pending IRQ.
+ */
+static void vfio_intp_interrupt(VFIOINTp *intp)
+{
+    int ret;
+    VFIOINTp *tmp;
+    VFIOPlatformDevice *vdev = intp->vdev;
+    bool delay_handling = false;
+
+    qemu_mutex_lock(&vdev->intp_mutex);
+    if (intp->state == VFIO_IRQ_INACTIVE) {
+        QLIST_FOREACH(tmp, &vdev->intp_list, next) {
+            if (tmp->state == VFIO_IRQ_ACTIVE ||
+                tmp->state == VFIO_IRQ_PENDING) {
+                delay_handling = true;
+                break;
+            }
+        }
+    }
+    if (delay_handling) {
+        /*
+         * the new IRQ gets a pending status and is pushed in
+         * the pending queue
+         */
+        intp->state = VFIO_IRQ_PENDING;
+        trace_vfio_intp_interrupt_set_pending(intp->pin);
+        QSIMPLEQ_INSERT_TAIL(&vdev->pending_intp_queue,
+                             intp, pqnext);
+        ret = event_notifier_test_and_clear(&intp->interrupt);
+        qemu_mutex_unlock(&vdev->intp_mutex);
+        return;
+    }
+
+    trace_vfio_platform_intp_interrupt(intp->pin,
+                              event_notifier_get_fd(&intp->interrupt));
+
+    ret = event_notifier_test_and_clear(&intp->interrupt);
+    if (!ret) {
+        error_report("Error when clearing fd=%d (ret = %d)\n",
+                     event_notifier_get_fd(&intp->interrupt), ret);
+    }
+
+    intp->state = VFIO_IRQ_ACTIVE;
+
+    /* sets slow path */
+    vfio_mmap_set_enabled(vdev, false);
+
+    /* trigger the virtual IRQ */
+    qemu_set_irq(intp->qemuirq, 1);
+
+    /*
+     * Schedule the mmap timer which will restore fastpath when no IRQ
+     * is active anymore
+     */
+    if (vdev->mmap_timeout) {
+        timer_mod(vdev->mmap_timer,
+                  qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
+                      vdev->mmap_timeout);
+    }
+    qemu_mutex_unlock(&vdev->intp_mutex);
+}
+
+/**
+ * vfio_platform_eoi - IRQ completion routine
+ * @vbasedev: the VFIO device handle
+ *
+ * De-asserts the active virtual IRQ and unmasks the physical IRQ
+ * (effective for level sensitive IRQ auto-masked by the  VFIO driver).
+ * Then it handles next pending IRQ if any.
+ * eoi function is called on the first access to any MMIO region
+ * after an IRQ was triggered, trapped since slow path was set.
+ * It is assumed this access corresponds to the IRQ status
+ * register reset. With such a mechanism, a single IRQ can be
+ * handled at a time since there is no way to know which IRQ
+ * was completed by the guest (we would need additional details
+ * about the IRQ status register mask).
+ */
+static void vfio_platform_eoi(VFIODevice *vbasedev)
+{
+    VFIOINTp *intp;
+    VFIOPlatformDevice *vdev =
+        container_of(vbasedev, VFIOPlatformDevice, vbasedev);
+
+    qemu_mutex_lock(&vdev->intp_mutex);
+    QLIST_FOREACH(intp, &vdev->intp_list, next) {
+        if (intp->state == VFIO_IRQ_ACTIVE) {
+            trace_vfio_platform_eoi(intp->pin,
+                                event_notifier_get_fd(&intp->interrupt));
+            intp->state = VFIO_IRQ_INACTIVE;
+
+            /* deassert the virtual IRQ */
+            qemu_set_irq(intp->qemuirq, 0);
+
+            if (intp->flags & VFIO_IRQ_INFO_AUTOMASKED) {
+                /* unmasks the physical level-sensitive IRQ */
+                vfio_unmask_single_irqindex(vbasedev, intp->pin);
+            }
+
+            /* a single IRQ can be active at a time */
+            break;
+        }
+    }
+    /* in case there are pending IRQs, handle the first one */
+    if (!QSIMPLEQ_EMPTY(&vdev->pending_intp_queue)) {
+        intp = QSIMPLEQ_FIRST(&vdev->pending_intp_queue);
+        vfio_intp_inject_pending_lockheld(intp);
+        QSIMPLEQ_REMOVE_HEAD(&vdev->pending_intp_queue, pqnext);
+    }
+    qemu_mutex_unlock(&vdev->intp_mutex);
+}
+
+/**
+ * vfio_start_eventfd_injection - starts the virtual IRQ injection using
+ * user-side handled eventfds
+ * @intp: the IRQ struct pointer
+ */
+
+static int vfio_start_eventfd_injection(VFIOINTp *intp)
+{
+    int ret;
+
+    ret = vfio_set_trigger_eventfd(intp, vfio_intp_interrupt);
+    if (ret) {
+        error_report("vfio: Error: Failed to pass IRQ fd to the driver: %m");
+    }
+    return ret;
+}
+
+/*
+ * Functions used for irqfd
+ */
+
+/**
+ * vfio_set_resample_eventfd - sets the resamplefd for an IRQ
+ * @intp: the IRQ struct handle
+ * programs the VFIO driver to unmask this IRQ when the
+ * intp->unmask eventfd is triggered
+ */
+static int vfio_set_resample_eventfd(VFIOINTp *intp)
+{
+    VFIODevice *vbasedev = &intp->vdev->vbasedev;
+    struct vfio_irq_set *irq_set;
+    int argsz, ret;
+    int32_t *pfd;
+
+    argsz = sizeof(*irq_set) + sizeof(*pfd);
+    irq_set = g_malloc0(argsz);
+    irq_set->argsz = argsz;
+    irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_UNMASK;
+    irq_set->index = intp->pin;
+    irq_set->start = 0;
+    irq_set->count = 1;
+    pfd = (int32_t *)&irq_set->data;
+    *pfd = event_notifier_get_fd(&intp->unmask);
+    qemu_set_fd_handler(*pfd, NULL, NULL, NULL);
+    ret = ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, irq_set);
+    g_free(irq_set);
+    if (ret < 0) {
+        error_report("vfio: Failed to set resample eventfd: %m");
+    }
+    return ret;
+}
+
+static void vfio_start_irqfd_injection(SysBusDevice *sbdev, qemu_irq irq)
+{
+    VFIOPlatformDevice *vdev = VFIO_PLATFORM_DEVICE(sbdev);
+    VFIOINTp *intp;
+
+    if (!kvm_irqfds_enabled() || !kvm_resamplefds_enabled() ||
+        !vdev->irqfd_allowed) {
+        return;
+    }
+
+    QLIST_FOREACH(intp, &vdev->intp_list, next) {
+        if (intp->qemuirq == irq) {
+            break;
+        }
+    }
+    assert(intp);
+
+    /* Get to a known interrupt state */
+    qemu_set_fd_handler(event_notifier_get_fd(&intp->interrupt),
+                        NULL, NULL, vdev);
+
+    vfio_mask_single_irqindex(&vdev->vbasedev, intp->pin);
+    qemu_set_irq(intp->qemuirq, 0);
+
+    if (kvm_irqchip_add_irqfd_notifier(kvm_state, &intp->interrupt,
+                                   &intp->unmask, irq) < 0) {
+        goto fail_irqfd;
+    }
+
+    if (vfio_set_trigger_eventfd(intp, NULL) < 0) {
+        goto fail_vfio;
+    }
+    if (vfio_set_resample_eventfd(intp) < 0) {
+        goto fail_vfio;
+    }
+
+    /* Let's resume injection with irqfd setup */
+    vfio_unmask_single_irqindex(&vdev->vbasedev, intp->pin);
+
+    intp->kvm_accel = true;
+
+    trace_vfio_platform_start_irqfd_injection(intp->pin,
+                                     event_notifier_get_fd(&intp->interrupt),
+                                     event_notifier_get_fd(&intp->unmask));
+    return;
+fail_vfio:
+    kvm_irqchip_remove_irqfd_notifier(kvm_state, &intp->interrupt, irq);
+fail_irqfd:
+    vfio_start_eventfd_injection(intp);
+    vfio_unmask_single_irqindex(&vdev->vbasedev, intp->pin);
+    return;
+}
+
+/* VFIO skeleton */
+
+static void vfio_platform_compute_needs_reset(VFIODevice *vbasedev)
+{
+    vbasedev->needs_reset = true;
+}
+
+/* not implemented yet */
+static int vfio_platform_hot_reset_multi(VFIODevice *vbasedev)
+{
+    return -1;
+}
+
+/**
+ * vfio_populate_device - Allocate and populate MMIO region
+ * and IRQ structs according to driver returned information
+ * @vbasedev: the VFIO device handle
+ *
+ */
+static int vfio_populate_device(VFIODevice *vbasedev)
+{
+    VFIOINTp *intp, *tmp;
+    int i, ret = -1;
+    VFIOPlatformDevice *vdev =
+        container_of(vbasedev, VFIOPlatformDevice, vbasedev);
+
+    if (!(vbasedev->flags & VFIO_DEVICE_FLAGS_PLATFORM)) {
+        error_report("vfio: Um, this isn't a platform device");
+        return ret;
+    }
+
+    vdev->regions = g_new0(VFIORegion *, vbasedev->num_regions);
+
+    for (i = 0; i < vbasedev->num_regions; i++) {
+        struct vfio_region_info reg_info = { .argsz = sizeof(reg_info) };
+        VFIORegion *ptr;
+
+        vdev->regions[i] = g_malloc0(sizeof(VFIORegion));
+        ptr = vdev->regions[i];
+        reg_info.index = i;
+        ret = ioctl(vbasedev->fd, VFIO_DEVICE_GET_REGION_INFO, &reg_info);
+        if (ret) {
+            error_report("vfio: Error getting region %d info: %m", i);
+            goto reg_error;
+        }
+        ptr->flags = reg_info.flags;
+        ptr->size = reg_info.size;
+        ptr->fd_offset = reg_info.offset;
+        ptr->nr = i;
+        ptr->vbasedev = vbasedev;
+
+        trace_vfio_platform_populate_regions(ptr->nr,
+                            (unsigned long)ptr->flags,
+                            (unsigned long)ptr->size,
+                            ptr->vbasedev->fd,
+                            (unsigned long)ptr->fd_offset);
+    }
+
+    vdev->mmap_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL,
+                                    vfio_intp_mmap_enable, vdev);
+
+    QSIMPLEQ_INIT(&vdev->pending_intp_queue);
+
+    for (i = 0; i < vbasedev->num_irqs; i++) {
+        struct vfio_irq_info irq = { .argsz = sizeof(irq) };
+
+        irq.index = i;
+        ret = ioctl(vbasedev->fd, VFIO_DEVICE_GET_IRQ_INFO, &irq);
+        if (ret) {
+            error_printf("vfio: error getting device %s irq info",
+                         vbasedev->name);
+            goto irq_err;
+        } else {
+            trace_vfio_platform_populate_interrupts(irq.index,
+                                                    irq.count,
+                                                    irq.flags);
+            intp = vfio_init_intp(vbasedev, irq);
+            if (!intp) {
+                error_report("vfio: Error installing IRQ %d up", i);
+                goto irq_err;
+            }
+        }
+    }
+    return 0;
+irq_err:
+    timer_del(vdev->mmap_timer);
+    QLIST_FOREACH_SAFE(intp, &vdev->intp_list, next, tmp) {
+        QLIST_REMOVE(intp, next);
+        g_free(intp);
+    }
+reg_error:
+    for (i = 0; i < vbasedev->num_regions; i++) {
+        g_free(vdev->regions[i]);
+    }
+    g_free(vdev->regions);
+    return ret;
+}
+
+/* specialized functions for VFIO Platform devices */
+static VFIODeviceOps vfio_platform_ops = {
+    .vfio_compute_needs_reset = vfio_platform_compute_needs_reset,
+    .vfio_hot_reset_multi = vfio_platform_hot_reset_multi,
+    .vfio_eoi = vfio_platform_eoi,
+};
+
+/**
+ * vfio_base_device_init - perform preliminary VFIO setup
+ * @vbasedev: the VFIO device handle
+ *
+ * Implement the VFIO command sequence that allows to discover
+ * assigned device resources: group extraction, device
+ * fd retrieval, resource query.
+ * Precondition: the device name must be initialized
+ */
+static int vfio_base_device_init(VFIODevice *vbasedev)
+{
+    VFIOGroup *group;
+    VFIODevice *vbasedev_iter;
+    char path[PATH_MAX], iommu_group_path[PATH_MAX], *group_name;
+    ssize_t len;
+    struct stat st;
+    int groupid;
+    int ret;
+
+    /* name must be set prior to the call */
+    if (!vbasedev->name || strchr(vbasedev->name, '/')) {
+        return -EINVAL;
+    }
+
+    /* Check that the host device exists */
+    g_snprintf(path, sizeof(path), "/sys/bus/platform/devices/%s/",
+               vbasedev->name);
+
+    if (stat(path, &st) < 0) {
+        error_report("vfio: error: no such host device: %s", path);
+        return -errno;
+    }
+
+    g_strlcat(path, "iommu_group", sizeof(path));
+    len = readlink(path, iommu_group_path, sizeof(iommu_group_path));
+    if (len < 0 || len >= sizeof(iommu_group_path)) {
+        error_report("vfio: error no iommu_group for device");
+        return len < 0 ? -errno : -ENAMETOOLONG;
+    }
+
+    iommu_group_path[len] = 0;
+    group_name = basename(iommu_group_path);
+
+    if (sscanf(group_name, "%d", &groupid) != 1) {
+        error_report("vfio: error reading %s: %m", path);
+        return -errno;
+    }
+
+    trace_vfio_platform_base_device_init(vbasedev->name, groupid);
+
+    group = vfio_get_group(groupid, &address_space_memory);
+    if (!group) {
+        error_report("vfio: failed to get group %d", groupid);
+        return -ENOENT;
+    }
+
+    g_snprintf(path, sizeof(path), "%s", vbasedev->name);
+
+    QLIST_FOREACH(vbasedev_iter, &group->device_list, next) {
+        if (strcmp(vbasedev_iter->name, vbasedev->name) == 0) {
+            error_report("vfio: error: device %s is already attached", path);
+            vfio_put_group(group);
+            return -EBUSY;
+        }
+    }
+    ret = vfio_get_device(group, path, vbasedev);
+    if (ret) {
+        error_report("vfio: failed to get device %s", path);
+        vfio_put_group(group);
+        return ret;
+    }
+
+    ret = vfio_populate_device(vbasedev);
+    if (ret) {
+        error_report("vfio: failed to populate device %s", path);
+        vfio_put_group(group);
+    }
+
+    return ret;
+}
+
+/**
+ * vfio_map_region - initialize the 2 memory regions for a given
+ * MMIO region index
+ * @vdev: the VFIO platform device handle
+ * @nr: the index of the region
+ *
+ * Init the top memory region and the mmapped memory region beneath
+ * VFIOPlatformDevice is used since VFIODevice is not a QOM Object
+ * and could not be passed to memory region functions
+*/
+static void vfio_map_region(VFIOPlatformDevice *vdev, int nr)
+{
+    VFIORegion *region = vdev->regions[nr];
+    uint64_t size = region->size;
+    char name[64];
+
+    if (!size) {
+        return;
+    }
+
+    g_snprintf(name, sizeof(name), "VFIO %s region %d",
+               vdev->vbasedev.name, nr);
+
+    /* A "slow" read/write mapping underlies all regions */
+    memory_region_init_io(&region->mem, OBJECT(vdev), &vfio_region_ops,
+                          region, name, size);
+
+    g_strlcat(name, " mmap", sizeof(name));
+
+    if (vfio_mmap_region(OBJECT(vdev), region, &region->mem,
+                         &region->mmap_mem, &region->mmap, size, 0, name)) {
+        error_report("%s unsupported. Performance may be slow", name);
+    }
+}
+
+/**
+ * vfio_platform_realize  - the device realize function
+ * @dev: device state pointer
+ * @errp: error
+ *
+ * initialize the device, its memory regions and IRQ structures
+ * IRQ are started separately
+ */
+static void vfio_platform_realize(DeviceState *dev, Error **errp)
+{
+    VFIOPlatformDevice *vdev = VFIO_PLATFORM_DEVICE(dev);
+    SysBusDevice *sbdev = SYS_BUS_DEVICE(dev);
+    VFIODevice *vbasedev = &vdev->vbasedev;
+    VFIOINTp *intp;
+    int i, ret;
+
+    vbasedev->type = VFIO_DEVICE_TYPE_PLATFORM;
+    vbasedev->ops = &vfio_platform_ops;
+
+    trace_vfio_platform_realize(vbasedev->name, vdev->compat);
+
+    ret = vfio_base_device_init(vbasedev);
+    if (ret) {
+        error_setg(errp, "vfio: vfio_base_device_init failed for %s",
+                   vbasedev->name);
+        return;
+    }
+
+    for (i = 0; i < vbasedev->num_regions; i++) {
+        vfio_map_region(vdev, i);
+        sysbus_init_mmio(sbdev, &vdev->regions[i]->mem);
+    }
+
+    QLIST_FOREACH(intp, &vdev->intp_list, next) {
+        vfio_start_eventfd_injection(intp);
+    }
+}
+
+static const VMStateDescription vfio_platform_vmstate = {
+    .name = TYPE_VFIO_PLATFORM,
+    .unmigratable = 1,
+};
+
+static Property vfio_platform_dev_properties[] = {
+    DEFINE_PROP_STRING("host", VFIOPlatformDevice, vbasedev.name),
+    DEFINE_PROP_BOOL("x-mmap", VFIOPlatformDevice, vbasedev.allow_mmap, true),
+    DEFINE_PROP_UINT32("mmap-timeout-ms", VFIOPlatformDevice,
+                       mmap_timeout, 1100),
+    DEFINE_PROP_BOOL("x-irqfd", VFIOPlatformDevice, irqfd_allowed, true),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void vfio_platform_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    SysBusDeviceClass *sbc = SYS_BUS_DEVICE_CLASS(klass);
+
+    dc->realize = vfio_platform_realize;
+    dc->props = vfio_platform_dev_properties;
+    dc->vmsd = &vfio_platform_vmstate;
+    dc->desc = "VFIO-based platform device assignment";
+    sbc->connect_irq_notifier = vfio_start_irqfd_injection;
+    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+}
+
+static const TypeInfo vfio_platform_dev_info = {
+    .name = TYPE_VFIO_PLATFORM,
+    .parent = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(VFIOPlatformDevice),
+    .class_init = vfio_platform_class_init,
+    .class_size = sizeof(VFIOPlatformDeviceClass),
+    .abstract   = true,
+};
+
+static void register_vfio_platform_dev_type(void)
+{
+    type_register_static(&vfio_platform_dev_info);
+}
+
+type_init(register_vfio_platform_dev_type)