Merge "Adding qemu as a submodule of KVMFORNFV"

1 files changed, 0 insertions, 1323 deletions

diff --git a/qemu/hw/misc/ivshmem.c b/qemu/hw/misc/ivshmem.c
deleted file mode 100644
index e40f23bfc..000000000
--- a/qemu/hw/misc/ivshmem.c
+++ /dev/null
@@ -1,1323 +0,0 @@
-/*
- * Inter-VM Shared Memory PCI device.
- *
- * Author:
- *      Cam Macdonell <cam@cs.ualberta.ca>
- *
- * Based On: cirrus_vga.c
- *          Copyright (c) 2004 Fabrice Bellard
- *          Copyright (c) 2004 Makoto Suzuki (suzu)
- *
- *      and rtl8139.c
- *          Copyright (c) 2006 Igor Kovalenko
- *
- * This code is licensed under the GNU GPL v2.
- *
- * Contributions after 2012-01-13 are licensed under the terms of the
- * GNU GPL, version 2 or (at your option) any later version.
- */
-#include "qemu/osdep.h"
-#include "qapi/error.h"
-#include "qemu/cutils.h"
-#include "hw/hw.h"
-#include "hw/i386/pc.h"
-#include "hw/pci/pci.h"
-#include "hw/pci/msi.h"
-#include "hw/pci/msix.h"
-#include "sysemu/kvm.h"
-#include "migration/migration.h"
-#include "qemu/error-report.h"
-#include "qemu/event_notifier.h"
-#include "qom/object_interfaces.h"
-#include "sysemu/char.h"
-#include "sysemu/hostmem.h"
-#include "sysemu/qtest.h"
-#include "qapi/visitor.h"
-#include "exec/ram_addr.h"
-
-#include "hw/misc/ivshmem.h"
-
-#include <sys/mman.h>
-
-#define PCI_VENDOR_ID_IVSHMEM   PCI_VENDOR_ID_REDHAT_QUMRANET
-#define PCI_DEVICE_ID_IVSHMEM   0x1110
-
-#define IVSHMEM_MAX_PEERS UINT16_MAX
-#define IVSHMEM_IOEVENTFD   0
-#define IVSHMEM_MSI     1
-
-#define IVSHMEM_REG_BAR_SIZE 0x100
-
-#define IVSHMEM_DEBUG 0
-#define IVSHMEM_DPRINTF(fmt, ...)                       \
-    do {                                                \
-        if (IVSHMEM_DEBUG) {                            \
-            printf("IVSHMEM: " fmt, ## __VA_ARGS__);    \
-        }                                               \
-    } while (0)
-
-#define TYPE_IVSHMEM_COMMON "ivshmem-common"
-#define IVSHMEM_COMMON(obj) \
-    OBJECT_CHECK(IVShmemState, (obj), TYPE_IVSHMEM_COMMON)
-
-#define TYPE_IVSHMEM_PLAIN "ivshmem-plain"
-#define IVSHMEM_PLAIN(obj) \
-    OBJECT_CHECK(IVShmemState, (obj), TYPE_IVSHMEM_PLAIN)
-
-#define TYPE_IVSHMEM_DOORBELL "ivshmem-doorbell"
-#define IVSHMEM_DOORBELL(obj) \
-    OBJECT_CHECK(IVShmemState, (obj), TYPE_IVSHMEM_DOORBELL)
-
-#define TYPE_IVSHMEM "ivshmem"
-#define IVSHMEM(obj) \
-    OBJECT_CHECK(IVShmemState, (obj), TYPE_IVSHMEM)
-
-typedef struct Peer {
-    int nb_eventfds;
-    EventNotifier *eventfds;
-} Peer;
-
-typedef struct MSIVector {
-    PCIDevice *pdev;
-    int virq;
-} MSIVector;
-
-typedef struct IVShmemState {
-    /*< private >*/
-    PCIDevice parent_obj;
-    /*< public >*/
-
-    uint32_t features;
-
-    /* exactly one of these two may be set */
-    HostMemoryBackend *hostmem; /* with interrupts */
-    CharDriverState *server_chr; /* without interrupts */
-
-    /* registers */
-    uint32_t intrmask;
-    uint32_t intrstatus;
-    int vm_id;
-
-    /* BARs */
-    MemoryRegion ivshmem_mmio;  /* BAR 0 (registers) */
-    MemoryRegion *ivshmem_bar2; /* BAR 2 (shared memory) */
-    MemoryRegion server_bar2;   /* used with server_chr */
-
-    /* interrupt support */
-    Peer *peers;
-    int nb_peers;               /* space in @peers[] */
-    uint32_t vectors;
-    MSIVector *msi_vectors;
-    uint64_t msg_buf;           /* buffer for receiving server messages */
-    int msg_buffered_bytes;     /* #bytes in @msg_buf */
-
-    /* migration stuff */
-    OnOffAuto master;
-    Error *migration_blocker;
-
-    /* legacy cruft */
-    char *role;
-    char *shmobj;
-    char *sizearg;
-    size_t legacy_size;
-    uint32_t not_legacy_32bit;
-} IVShmemState;
-
-/* registers for the Inter-VM shared memory device */
-enum ivshmem_registers {
-    INTRMASK = 0,
-    INTRSTATUS = 4,
-    IVPOSITION = 8,
-    DOORBELL = 12,
-};
-
-static inline uint32_t ivshmem_has_feature(IVShmemState *ivs,
-                                                    unsigned int feature) {
-    return (ivs->features & (1 << feature));
-}
-
-static inline bool ivshmem_is_master(IVShmemState *s)
-{
-    assert(s->master != ON_OFF_AUTO_AUTO);
-    return s->master == ON_OFF_AUTO_ON;
-}
-
-static void ivshmem_update_irq(IVShmemState *s)
-{
-    PCIDevice *d = PCI_DEVICE(s);
-    uint32_t isr = s->intrstatus & s->intrmask;
-
-    /*
-     * Do nothing unless the device actually uses INTx.  Here's how
-     * the device variants signal interrupts, what they put in PCI
-     * config space:
-     * Device variant    Interrupt  Interrupt Pin  MSI-X cap.
-     * ivshmem-plain         none            0         no
-     * ivshmem-doorbell     MSI-X            1        yes(1)
-     * ivshmem,msi=off       INTx            1         no
-     * ivshmem,msi=on       MSI-X            1(2)     yes(1)
-     * (1) if guest enabled MSI-X
-     * (2) the device lies
-     * Leads to the condition for doing nothing:
-     */
-    if (ivshmem_has_feature(s, IVSHMEM_MSI)
-        || !d->config[PCI_INTERRUPT_PIN]) {
-        return;
-    }
-
-    /* don't print ISR resets */
-    if (isr) {
-        IVSHMEM_DPRINTF("Set IRQ to %d (%04x %04x)\n",
-                        isr ? 1 : 0, s->intrstatus, s->intrmask);
-    }
-
-    pci_set_irq(d, isr != 0);
-}
-
-static void ivshmem_IntrMask_write(IVShmemState *s, uint32_t val)
-{
-    IVSHMEM_DPRINTF("IntrMask write(w) val = 0x%04x\n", val);
-
-    s->intrmask = val;
-    ivshmem_update_irq(s);
-}
-
-static uint32_t ivshmem_IntrMask_read(IVShmemState *s)
-{
-    uint32_t ret = s->intrmask;
-
-    IVSHMEM_DPRINTF("intrmask read(w) val = 0x%04x\n", ret);
-    return ret;
-}
-
-static void ivshmem_IntrStatus_write(IVShmemState *s, uint32_t val)
-{
-    IVSHMEM_DPRINTF("IntrStatus write(w) val = 0x%04x\n", val);
-
-    s->intrstatus = val;
-    ivshmem_update_irq(s);
-}
-
-static uint32_t ivshmem_IntrStatus_read(IVShmemState *s)
-{
-    uint32_t ret = s->intrstatus;
-
-    /* reading ISR clears all interrupts */
-    s->intrstatus = 0;
-    ivshmem_update_irq(s);
-    return ret;
-}
-
-static void ivshmem_io_write(void *opaque, hwaddr addr,
-                             uint64_t val, unsigned size)
-{
-    IVShmemState *s = opaque;
-
-    uint16_t dest = val >> 16;
-    uint16_t vector = val & 0xff;
-
-    addr &= 0xfc;
-
-    IVSHMEM_DPRINTF("writing to addr " TARGET_FMT_plx "\n", addr);
-    switch (addr)
-    {
-        case INTRMASK:
-            ivshmem_IntrMask_write(s, val);
-            break;
-
-        case INTRSTATUS:
-            ivshmem_IntrStatus_write(s, val);
-            break;
-
-        case DOORBELL:
-            /* check that dest VM ID is reasonable */
-            if (dest >= s->nb_peers) {
-                IVSHMEM_DPRINTF("Invalid destination VM ID (%d)\n", dest);
-                break;
-            }
-
-            /* check doorbell range */
-            if (vector < s->peers[dest].nb_eventfds) {
-                IVSHMEM_DPRINTF("Notifying VM %d on vector %d\n", dest, vector);
-                event_notifier_set(&s->peers[dest].eventfds[vector]);
-            } else {
-                IVSHMEM_DPRINTF("Invalid destination vector %d on VM %d\n",
-                                vector, dest);
-            }
-            break;
-        default:
-            IVSHMEM_DPRINTF("Unhandled write " TARGET_FMT_plx "\n", addr);
-    }
-}
-
-static uint64_t ivshmem_io_read(void *opaque, hwaddr addr,
-                                unsigned size)
-{
-
-    IVShmemState *s = opaque;
-    uint32_t ret;
-
-    switch (addr)
-    {
-        case INTRMASK:
-            ret = ivshmem_IntrMask_read(s);
-            break;
-
-        case INTRSTATUS:
-            ret = ivshmem_IntrStatus_read(s);
-            break;
-
-        case IVPOSITION:
-            ret = s->vm_id;
-            break;
-
-        default:
-            IVSHMEM_DPRINTF("why are we reading " TARGET_FMT_plx "\n", addr);
-            ret = 0;
-    }
-
-    return ret;
-}
-
-static const MemoryRegionOps ivshmem_mmio_ops = {
-    .read = ivshmem_io_read,
-    .write = ivshmem_io_write,
-    .endianness = DEVICE_NATIVE_ENDIAN,
-    .impl = {
-        .min_access_size = 4,
-        .max_access_size = 4,
-    },
-};
-
-static void ivshmem_vector_notify(void *opaque)
-{
-    MSIVector *entry = opaque;
-    PCIDevice *pdev = entry->pdev;
-    IVShmemState *s = IVSHMEM_COMMON(pdev);
-    int vector = entry - s->msi_vectors;
-    EventNotifier *n = &s->peers[s->vm_id].eventfds[vector];
-
-    if (!event_notifier_test_and_clear(n)) {
-        return;
-    }
-
-    IVSHMEM_DPRINTF("interrupt on vector %p %d\n", pdev, vector);
-    if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
-        if (msix_enabled(pdev)) {
-            msix_notify(pdev, vector);
-        }
-    } else {
-        ivshmem_IntrStatus_write(s, 1);
-    }
-}
-
-static int ivshmem_vector_unmask(PCIDevice *dev, unsigned vector,
-                                 MSIMessage msg)
-{
-    IVShmemState *s = IVSHMEM_COMMON(dev);
-    EventNotifier *n = &s->peers[s->vm_id].eventfds[vector];
-    MSIVector *v = &s->msi_vectors[vector];
-    int ret;
-
-    IVSHMEM_DPRINTF("vector unmask %p %d\n", dev, vector);
-
-    ret = kvm_irqchip_update_msi_route(kvm_state, v->virq, msg, dev);
-    if (ret < 0) {
-        return ret;
-    }
-
-    return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, n, NULL, v->virq);
-}
-
-static void ivshmem_vector_mask(PCIDevice *dev, unsigned vector)
-{
-    IVShmemState *s = IVSHMEM_COMMON(dev);
-    EventNotifier *n = &s->peers[s->vm_id].eventfds[vector];
-    int ret;
-
-    IVSHMEM_DPRINTF("vector mask %p %d\n", dev, vector);
-
-    ret = kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, n,
-                                                s->msi_vectors[vector].virq);
-    if (ret != 0) {
-        error_report("remove_irqfd_notifier_gsi failed");
-    }
-}
-
-static void ivshmem_vector_poll(PCIDevice *dev,
-                                unsigned int vector_start,
-                                unsigned int vector_end)
-{
-    IVShmemState *s = IVSHMEM_COMMON(dev);
-    unsigned int vector;
-
-    IVSHMEM_DPRINTF("vector poll %p %d-%d\n", dev, vector_start, vector_end);
-
-    vector_end = MIN(vector_end, s->vectors);
-
-    for (vector = vector_start; vector < vector_end; vector++) {
-        EventNotifier *notifier = &s->peers[s->vm_id].eventfds[vector];
-
-        if (!msix_is_masked(dev, vector)) {
-            continue;
-        }
-
-        if (event_notifier_test_and_clear(notifier)) {
-            msix_set_pending(dev, vector);
-        }
-    }
-}
-
-static void watch_vector_notifier(IVShmemState *s, EventNotifier *n,
-                                 int vector)
-{
-    int eventfd = event_notifier_get_fd(n);
-
-    assert(!s->msi_vectors[vector].pdev);
-    s->msi_vectors[vector].pdev = PCI_DEVICE(s);
-
-    qemu_set_fd_handler(eventfd, ivshmem_vector_notify,
-                        NULL, &s->msi_vectors[vector]);
-}
-
-static void ivshmem_add_eventfd(IVShmemState *s, int posn, int i)
-{
-    memory_region_add_eventfd(&s->ivshmem_mmio,
-                              DOORBELL,
-                              4,
-                              true,
-                              (posn << 16) | i,
-                              &s->peers[posn].eventfds[i]);
-}
-
-static void ivshmem_del_eventfd(IVShmemState *s, int posn, int i)
-{
-    memory_region_del_eventfd(&s->ivshmem_mmio,
-                              DOORBELL,
-                              4,
-                              true,
-                              (posn << 16) | i,
-                              &s->peers[posn].eventfds[i]);
-}
-
-static void close_peer_eventfds(IVShmemState *s, int posn)
-{
-    int i, n;
-
-    assert(posn >= 0 && posn < s->nb_peers);
-    n = s->peers[posn].nb_eventfds;
-
-    if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) {
-        memory_region_transaction_begin();
-        for (i = 0; i < n; i++) {
-            ivshmem_del_eventfd(s, posn, i);
-        }
-        memory_region_transaction_commit();
-    }
-
-    for (i = 0; i < n; i++) {
-        event_notifier_cleanup(&s->peers[posn].eventfds[i]);
-    }
-
-    g_free(s->peers[posn].eventfds);
-    s->peers[posn].nb_eventfds = 0;
-}
-
-static void resize_peers(IVShmemState *s, int nb_peers)
-{
-    int old_nb_peers = s->nb_peers;
-    int i;
-
-    assert(nb_peers > old_nb_peers);
-    IVSHMEM_DPRINTF("bumping storage to %d peers\n", nb_peers);
-
-    s->peers = g_realloc(s->peers, nb_peers * sizeof(Peer));
-    s->nb_peers = nb_peers;
-
-    for (i = old_nb_peers; i < nb_peers; i++) {
-        s->peers[i].eventfds = g_new0(EventNotifier, s->vectors);
-        s->peers[i].nb_eventfds = 0;
-    }
-}
-
-static void ivshmem_add_kvm_msi_virq(IVShmemState *s, int vector,
-                                     Error **errp)
-{
-    PCIDevice *pdev = PCI_DEVICE(s);
-    MSIMessage msg = msix_get_message(pdev, vector);
-    int ret;
-
-    IVSHMEM_DPRINTF("ivshmem_add_kvm_msi_virq vector:%d\n", vector);
-    assert(!s->msi_vectors[vector].pdev);
-
-    ret = kvm_irqchip_add_msi_route(kvm_state, msg, pdev);
-    if (ret < 0) {
-        error_setg(errp, "kvm_irqchip_add_msi_route failed");
-        return;
-    }
-
-    s->msi_vectors[vector].virq = ret;
-    s->msi_vectors[vector].pdev = pdev;
-}
-
-static void setup_interrupt(IVShmemState *s, int vector, Error **errp)
-{
-    EventNotifier *n = &s->peers[s->vm_id].eventfds[vector];
-    bool with_irqfd = kvm_msi_via_irqfd_enabled() &&
-        ivshmem_has_feature(s, IVSHMEM_MSI);
-    PCIDevice *pdev = PCI_DEVICE(s);
-    Error *err = NULL;
-
-    IVSHMEM_DPRINTF("setting up interrupt for vector: %d\n", vector);
-
-    if (!with_irqfd) {
-        IVSHMEM_DPRINTF("with eventfd\n");
-        watch_vector_notifier(s, n, vector);
-    } else if (msix_enabled(pdev)) {
-        IVSHMEM_DPRINTF("with irqfd\n");
-        ivshmem_add_kvm_msi_virq(s, vector, &err);
-        if (err) {
-            error_propagate(errp, err);
-            return;
-        }
-
-        if (!msix_is_masked(pdev, vector)) {
-            kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, n, NULL,
-                                               s->msi_vectors[vector].virq);
-            /* TODO handle error */
-        }
-    } else {
-        /* it will be delayed until msix is enabled, in write_config */
-        IVSHMEM_DPRINTF("with irqfd, delayed until msix enabled\n");
-    }
-}
-
-static void process_msg_shmem(IVShmemState *s, int fd, Error **errp)
-{
-    struct stat buf;
-    size_t size;
-    void *ptr;
-
-    if (s->ivshmem_bar2) {
-        error_setg(errp, "server sent unexpected shared memory message");
-        close(fd);
-        return;
-    }
-
-    if (fstat(fd, &buf) < 0) {
-        error_setg_errno(errp, errno,
-            "can't determine size of shared memory sent by server");
-        close(fd);
-        return;
-    }
-
-    size = buf.st_size;
-
-    /* Legacy cruft */
-    if (s->legacy_size != SIZE_MAX) {
-        if (size < s->legacy_size) {
-            error_setg(errp, "server sent only %zd bytes of shared memory",
-                       (size_t)buf.st_size);
-            close(fd);
-            return;
-        }
-        size = s->legacy_size;
-    }
-
-    /* mmap the region and map into the BAR2 */
-    ptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
-    if (ptr == MAP_FAILED) {
-        error_setg_errno(errp, errno, "Failed to mmap shared memory");
-        close(fd);
-        return;
-    }
-    memory_region_init_ram_ptr(&s->server_bar2, OBJECT(s),
-                               "ivshmem.bar2", size, ptr);
-    qemu_set_ram_fd(memory_region_get_ram_addr(&s->server_bar2), fd);
-    s->ivshmem_bar2 = &s->server_bar2;
-}
-
-static void process_msg_disconnect(IVShmemState *s, uint16_t posn,
-                                   Error **errp)
-{
-    IVSHMEM_DPRINTF("posn %d has gone away\n", posn);
-    if (posn >= s->nb_peers || posn == s->vm_id) {
-        error_setg(errp, "invalid peer %d", posn);
-        return;
-    }
-    close_peer_eventfds(s, posn);
-}
-
-static void process_msg_connect(IVShmemState *s, uint16_t posn, int fd,
-                                Error **errp)
-{
-    Peer *peer = &s->peers[posn];
-    int vector;
-
-    /*
-     * The N-th connect message for this peer comes with the file
-     * descriptor for vector N-1.  Count messages to find the vector.
-     */
-    if (peer->nb_eventfds >= s->vectors) {
-        error_setg(errp, "Too many eventfd received, device has %d vectors",
-                   s->vectors);
-        close(fd);
-        return;
-    }
-    vector = peer->nb_eventfds++;
-
-    IVSHMEM_DPRINTF("eventfds[%d][%d] = %d\n", posn, vector, fd);
-    event_notifier_init_fd(&peer->eventfds[vector], fd);
-    fcntl_setfl(fd, O_NONBLOCK); /* msix/irqfd poll non block */
-
-    if (posn == s->vm_id) {
-        setup_interrupt(s, vector, errp);
-        /* TODO do we need to handle the error? */
-    }
-
-    if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) {
-        ivshmem_add_eventfd(s, posn, vector);
-    }
-}
-
-static void process_msg(IVShmemState *s, int64_t msg, int fd, Error **errp)
-{
-    IVSHMEM_DPRINTF("posn is %" PRId64 ", fd is %d\n", msg, fd);
-
-    if (msg < -1 || msg > IVSHMEM_MAX_PEERS) {
-        error_setg(errp, "server sent invalid message %" PRId64, msg);
-        close(fd);
-        return;
-    }
-
-    if (msg == -1) {
-        process_msg_shmem(s, fd, errp);
-        return;
-    }
-
-    if (msg >= s->nb_peers) {
-        resize_peers(s, msg + 1);
-    }
-
-    if (fd >= 0) {
-        process_msg_connect(s, msg, fd, errp);
-    } else {
-        process_msg_disconnect(s, msg, errp);
-    }
-}
-
-static int ivshmem_can_receive(void *opaque)
-{
-    IVShmemState *s = opaque;
-
-    assert(s->msg_buffered_bytes < sizeof(s->msg_buf));
-    return sizeof(s->msg_buf) - s->msg_buffered_bytes;
-}
-
-static void ivshmem_read(void *opaque, const uint8_t *buf, int size)
-{
-    IVShmemState *s = opaque;
-    Error *err = NULL;
-    int fd;
-    int64_t msg;
-
-    assert(size >= 0 && s->msg_buffered_bytes + size <= sizeof(s->msg_buf));
-    memcpy((unsigned char *)&s->msg_buf + s->msg_buffered_bytes, buf, size);
-    s->msg_buffered_bytes += size;
-    if (s->msg_buffered_bytes < sizeof(s->msg_buf)) {
-        return;
-    }
-    msg = le64_to_cpu(s->msg_buf);
-    s->msg_buffered_bytes = 0;
-
-    fd = qemu_chr_fe_get_msgfd(s->server_chr);
-    IVSHMEM_DPRINTF("posn is %" PRId64 ", fd is %d\n", msg, fd);
-
-    process_msg(s, msg, fd, &err);
-    if (err) {
-        error_report_err(err);
-    }
-}
-
-static int64_t ivshmem_recv_msg(IVShmemState *s, int *pfd, Error **errp)
-{
-    int64_t msg;
-    int n, ret;
-
-    n = 0;
-    do {
-        ret = qemu_chr_fe_read_all(s->server_chr, (uint8_t *)&msg + n,
-                                 sizeof(msg) - n);
-        if (ret < 0 && ret != -EINTR) {
-            error_setg_errno(errp, -ret, "read from server failed");
-            return INT64_MIN;
-        }
-        n += ret;
-    } while (n < sizeof(msg));
-
-    *pfd = qemu_chr_fe_get_msgfd(s->server_chr);
-    return msg;
-}
-
-static void ivshmem_recv_setup(IVShmemState *s, Error **errp)
-{
-    Error *err = NULL;
-    int64_t msg;
-    int fd;
-
-    msg = ivshmem_recv_msg(s, &fd, &err);
-    if (err) {
-        error_propagate(errp, err);
-        return;
-    }
-    if (msg != IVSHMEM_PROTOCOL_VERSION) {
-        error_setg(errp, "server sent version %" PRId64 ", expecting %d",
-                   msg, IVSHMEM_PROTOCOL_VERSION);
-        return;
-    }
-    if (fd != -1) {
-        error_setg(errp, "server sent invalid version message");
-        return;
-    }
-
-    /*
-     * ivshmem-server sends the remaining initial messages in a fixed
-     * order, but the device has always accepted them in any order.
-     * Stay as compatible as practical, just in case people use
-     * servers that behave differently.
-     */
-
-    /*
-     * ivshmem_device_spec.txt has always required the ID message
-     * right here, and ivshmem-server has always complied.  However,
-     * older versions of the device accepted it out of order, but
-     * broke when an interrupt setup message arrived before it.
-     */
-    msg = ivshmem_recv_msg(s, &fd, &err);
-    if (err) {
-        error_propagate(errp, err);
-        return;
-    }
-    if (fd != -1 || msg < 0 || msg > IVSHMEM_MAX_PEERS) {
-        error_setg(errp, "server sent invalid ID message");
-        return;
-    }
-    s->vm_id = msg;
-
-    /*
-     * Receive more messages until we got shared memory.
-     */
-    do {
-        msg = ivshmem_recv_msg(s, &fd, &err);
-        if (err) {
-            error_propagate(errp, err);
-            return;
-        }
-        process_msg(s, msg, fd, &err);
-        if (err) {
-            error_propagate(errp, err);
-            return;
-        }
-    } while (msg != -1);
-
-    /*
-     * This function must either map the shared memory or fail.  The
-     * loop above ensures that: it terminates normally only after it
-     * successfully processed the server's shared memory message.
-     * Assert that actually mapped the shared memory:
-     */
-    assert(s->ivshmem_bar2);
-}
-
-/* Select the MSI-X vectors used by device.
- * ivshmem maps events to vectors statically, so
- * we just enable all vectors on init and after reset. */
-static void ivshmem_msix_vector_use(IVShmemState *s)
-{
-    PCIDevice *d = PCI_DEVICE(s);
-    int i;
-
-    for (i = 0; i < s->vectors; i++) {
-        msix_vector_use(d, i);
-    }
-}
-
-static void ivshmem_reset(DeviceState *d)
-{
-    IVShmemState *s = IVSHMEM_COMMON(d);
-
-    s->intrstatus = 0;
-    s->intrmask = 0;
-    if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
-        ivshmem_msix_vector_use(s);
-    }
-}
-
-static int ivshmem_setup_interrupts(IVShmemState *s)
-{
-    /* allocate QEMU callback data for receiving interrupts */
-    s->msi_vectors = g_malloc0(s->vectors * sizeof(MSIVector));
-
-    if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
-        if (msix_init_exclusive_bar(PCI_DEVICE(s), s->vectors, 1)) {
-            return -1;
-        }
-
-        IVSHMEM_DPRINTF("msix initialized (%d vectors)\n", s->vectors);
-        ivshmem_msix_vector_use(s);
-    }
-
-    return 0;
-}
-
-static void ivshmem_enable_irqfd(IVShmemState *s)
-{
-    PCIDevice *pdev = PCI_DEVICE(s);
-    int i;
-
-    for (i = 0; i < s->peers[s->vm_id].nb_eventfds; i++) {
-        Error *err = NULL;
-
-        ivshmem_add_kvm_msi_virq(s, i, &err);
-        if (err) {
-            error_report_err(err);
-            /* TODO do we need to handle the error? */
-        }
-    }
-
-    if (msix_set_vector_notifiers(pdev,
-                                  ivshmem_vector_unmask,
-                                  ivshmem_vector_mask,
-                                  ivshmem_vector_poll)) {
-        error_report("ivshmem: msix_set_vector_notifiers failed");
-    }
-}
-
-static void ivshmem_remove_kvm_msi_virq(IVShmemState *s, int vector)
-{
-    IVSHMEM_DPRINTF("ivshmem_remove_kvm_msi_virq vector:%d\n", vector);
-
-    if (s->msi_vectors[vector].pdev == NULL) {
-        return;
-    }
-
-    /* it was cleaned when masked in the frontend. */
-    kvm_irqchip_release_virq(kvm_state, s->msi_vectors[vector].virq);
-
-    s->msi_vectors[vector].pdev = NULL;
-}
-
-static void ivshmem_disable_irqfd(IVShmemState *s)
-{
-    PCIDevice *pdev = PCI_DEVICE(s);
-    int i;
-
-    for (i = 0; i < s->peers[s->vm_id].nb_eventfds; i++) {
-        ivshmem_remove_kvm_msi_virq(s, i);
-    }
-
-    msix_unset_vector_notifiers(pdev);
-}
-
-static void ivshmem_write_config(PCIDevice *pdev, uint32_t address,
-                                 uint32_t val, int len)
-{
-    IVShmemState *s = IVSHMEM_COMMON(pdev);
-    int is_enabled, was_enabled = msix_enabled(pdev);
-
-    pci_default_write_config(pdev, address, val, len);
-    is_enabled = msix_enabled(pdev);
-
-    if (kvm_msi_via_irqfd_enabled()) {
-        if (!was_enabled && is_enabled) {
-            ivshmem_enable_irqfd(s);
-        } else if (was_enabled && !is_enabled) {
-            ivshmem_disable_irqfd(s);
-        }
-    }
-}
-
-static void ivshmem_common_realize(PCIDevice *dev, Error **errp)
-{
-    IVShmemState *s = IVSHMEM_COMMON(dev);
-    Error *err = NULL;
-    uint8_t *pci_conf;
-    uint8_t attr = PCI_BASE_ADDRESS_SPACE_MEMORY |
-        PCI_BASE_ADDRESS_MEM_PREFETCH;
-
-    /* IRQFD requires MSI */
-    if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD) &&
-        !ivshmem_has_feature(s, IVSHMEM_MSI)) {
-        error_setg(errp, "ioeventfd/irqfd requires MSI");
-        return;
-    }
-
-    pci_conf = dev->config;
-    pci_conf[PCI_COMMAND] = PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
-
-    memory_region_init_io(&s->ivshmem_mmio, OBJECT(s), &ivshmem_mmio_ops, s,
-                          "ivshmem-mmio", IVSHMEM_REG_BAR_SIZE);
-
-    /* region for registers*/
-    pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY,
-                     &s->ivshmem_mmio);
-
-    if (!s->not_legacy_32bit) {
-        attr |= PCI_BASE_ADDRESS_MEM_TYPE_64;
-    }
-
-    if (s->hostmem != NULL) {
-        IVSHMEM_DPRINTF("using hostmem\n");
-
-        s->ivshmem_bar2 = host_memory_backend_get_memory(s->hostmem,
-                                                         &error_abort);
-    } else {
-        assert(s->server_chr);
-
-        IVSHMEM_DPRINTF("using shared memory server (socket = %s)\n",
-                        s->server_chr->filename);
-
-        /* we allocate enough space for 16 peers and grow as needed */
-        resize_peers(s, 16);
-
-        /*
-         * Receive setup messages from server synchronously.
-         * Older versions did it asynchronously, but that creates a
-         * number of entertaining race conditions.
-         */
-        ivshmem_recv_setup(s, &err);
-        if (err) {
-            error_propagate(errp, err);
-            return;
-        }
-
-        if (s->master == ON_OFF_AUTO_ON && s->vm_id != 0) {
-            error_setg(errp,
-                       "master must connect to the server before any peers");
-            return;
-        }
-
-        qemu_chr_add_handlers(s->server_chr, ivshmem_can_receive,
-                              ivshmem_read, NULL, s);
-
-        if (ivshmem_setup_interrupts(s) < 0) {
-            error_setg(errp, "failed to initialize interrupts");
-            return;
-        }
-    }
-
-    vmstate_register_ram(s->ivshmem_bar2, DEVICE(s));
-    pci_register_bar(PCI_DEVICE(s), 2, attr, s->ivshmem_bar2);
-
-    if (s->master == ON_OFF_AUTO_AUTO) {
-        s->master = s->vm_id == 0 ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
-    }
-
-    if (!ivshmem_is_master(s)) {
-        error_setg(&s->migration_blocker,
-                   "Migration is disabled when using feature 'peer mode' in device 'ivshmem'");
-        migrate_add_blocker(s->migration_blocker);
-    }
-}
-
-static void ivshmem_exit(PCIDevice *dev)
-{
-    IVShmemState *s = IVSHMEM_COMMON(dev);
-    int i;
-
-    if (s->migration_blocker) {
-        migrate_del_blocker(s->migration_blocker);
-        error_free(s->migration_blocker);
-    }
-
-    if (memory_region_is_mapped(s->ivshmem_bar2)) {
-        if (!s->hostmem) {
-            void *addr = memory_region_get_ram_ptr(s->ivshmem_bar2);
-            int fd;
-
-            if (munmap(addr, memory_region_size(s->ivshmem_bar2) == -1)) {
-                error_report("Failed to munmap shared memory %s",
-                             strerror(errno));
-            }
-
-            fd = qemu_get_ram_fd(memory_region_get_ram_addr(s->ivshmem_bar2));
-            close(fd);
-        }
-
-        vmstate_unregister_ram(s->ivshmem_bar2, DEVICE(dev));
-    }
-
-    if (s->peers) {
-        for (i = 0; i < s->nb_peers; i++) {
-            close_peer_eventfds(s, i);
-        }
-        g_free(s->peers);
-    }
-
-    if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
-        msix_uninit_exclusive_bar(dev);
-    }
-
-    g_free(s->msi_vectors);
-}
-
-static int ivshmem_pre_load(void *opaque)
-{
-    IVShmemState *s = opaque;
-
-    if (!ivshmem_is_master(s)) {
-        error_report("'peer' devices are not migratable");
-        return -EINVAL;
-    }
-
-    return 0;
-}
-
-static int ivshmem_post_load(void *opaque, int version_id)
-{
-    IVShmemState *s = opaque;
-
-    if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
-        ivshmem_msix_vector_use(s);
-    }
-    return 0;
-}
-
-static void ivshmem_common_class_init(ObjectClass *klass, void *data)
-{
-    DeviceClass *dc = DEVICE_CLASS(klass);
-    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
-
-    k->realize = ivshmem_common_realize;
-    k->exit = ivshmem_exit;
-    k->config_write = ivshmem_write_config;
-    k->vendor_id = PCI_VENDOR_ID_IVSHMEM;
-    k->device_id = PCI_DEVICE_ID_IVSHMEM;
-    k->class_id = PCI_CLASS_MEMORY_RAM;
-    k->revision = 1;
-    dc->reset = ivshmem_reset;
-    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
-    dc->desc = "Inter-VM shared memory";
-}
-
-static const TypeInfo ivshmem_common_info = {
-    .name          = TYPE_IVSHMEM_COMMON,
-    .parent        = TYPE_PCI_DEVICE,
-    .instance_size = sizeof(IVShmemState),
-    .abstract      = true,
-    .class_init    = ivshmem_common_class_init,
-};
-
-static void ivshmem_check_memdev_is_busy(Object *obj, const char *name,
-                                         Object *val, Error **errp)
-{
-    MemoryRegion *mr;
-
-    mr = host_memory_backend_get_memory(MEMORY_BACKEND(val), &error_abort);
-    if (memory_region_is_mapped(mr)) {
-        char *path = object_get_canonical_path_component(val);
-        error_setg(errp, "can't use already busy memdev: %s", path);
-        g_free(path);
-    } else {
-        qdev_prop_allow_set_link_before_realize(obj, name, val, errp);
-    }
-}
-
-static const VMStateDescription ivshmem_plain_vmsd = {
-    .name = TYPE_IVSHMEM_PLAIN,
-    .version_id = 0,
-    .minimum_version_id = 0,
-    .pre_load = ivshmem_pre_load,
-    .post_load = ivshmem_post_load,
-    .fields = (VMStateField[]) {
-        VMSTATE_PCI_DEVICE(parent_obj, IVShmemState),
-        VMSTATE_UINT32(intrstatus, IVShmemState),
-        VMSTATE_UINT32(intrmask, IVShmemState),
-        VMSTATE_END_OF_LIST()
-    },
-};
-
-static Property ivshmem_plain_properties[] = {
-    DEFINE_PROP_ON_OFF_AUTO("master", IVShmemState, master, ON_OFF_AUTO_OFF),
-    DEFINE_PROP_END_OF_LIST(),
-};
-
-static void ivshmem_plain_init(Object *obj)
-{
-    IVShmemState *s = IVSHMEM_PLAIN(obj);
-
-    object_property_add_link(obj, "memdev", TYPE_MEMORY_BACKEND,
-                             (Object **)&s->hostmem,
-                             ivshmem_check_memdev_is_busy,
-                             OBJ_PROP_LINK_UNREF_ON_RELEASE,
-                             &error_abort);
-}
-
-static void ivshmem_plain_realize(PCIDevice *dev, Error **errp)
-{
-    IVShmemState *s = IVSHMEM_COMMON(dev);
-
-    if (!s->hostmem) {
-        error_setg(errp, "You must specify a 'memdev'");
-        return;
-    }
-
-    ivshmem_common_realize(dev, errp);
-}
-
-static void ivshmem_plain_class_init(ObjectClass *klass, void *data)
-{
-    DeviceClass *dc = DEVICE_CLASS(klass);
-    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
-
-    k->realize = ivshmem_plain_realize;
-    dc->props = ivshmem_plain_properties;
-    dc->vmsd = &ivshmem_plain_vmsd;
-}
-
-static const TypeInfo ivshmem_plain_info = {
-    .name          = TYPE_IVSHMEM_PLAIN,
-    .parent        = TYPE_IVSHMEM_COMMON,
-    .instance_size = sizeof(IVShmemState),
-    .instance_init = ivshmem_plain_init,
-    .class_init    = ivshmem_plain_class_init,
-};
-
-static const VMStateDescription ivshmem_doorbell_vmsd = {
-    .name = TYPE_IVSHMEM_DOORBELL,
-    .version_id = 0,
-    .minimum_version_id = 0,
-    .pre_load = ivshmem_pre_load,
-    .post_load = ivshmem_post_load,
-    .fields = (VMStateField[]) {
-        VMSTATE_PCI_DEVICE(parent_obj, IVShmemState),
-        VMSTATE_MSIX(parent_obj, IVShmemState),
-        VMSTATE_UINT32(intrstatus, IVShmemState),
-        VMSTATE_UINT32(intrmask, IVShmemState),
-        VMSTATE_END_OF_LIST()
-    },
-};
-
-static Property ivshmem_doorbell_properties[] = {
-    DEFINE_PROP_CHR("chardev", IVShmemState, server_chr),
-    DEFINE_PROP_UINT32("vectors", IVShmemState, vectors, 1),
-    DEFINE_PROP_BIT("ioeventfd", IVShmemState, features, IVSHMEM_IOEVENTFD,
-                    true),
-    DEFINE_PROP_ON_OFF_AUTO("master", IVShmemState, master, ON_OFF_AUTO_OFF),
-    DEFINE_PROP_END_OF_LIST(),
-};
-
-static void ivshmem_doorbell_init(Object *obj)
-{
-    IVShmemState *s = IVSHMEM_DOORBELL(obj);
-
-    s->features |= (1 << IVSHMEM_MSI);
-    s->legacy_size = SIZE_MAX;  /* whatever the server sends */
-}
-
-static void ivshmem_doorbell_realize(PCIDevice *dev, Error **errp)
-{
-    IVShmemState *s = IVSHMEM_COMMON(dev);
-
-    if (!s->server_chr) {
-        error_setg(errp, "You must specify a 'chardev'");
-        return;
-    }
-
-    ivshmem_common_realize(dev, errp);
-}
-
-static void ivshmem_doorbell_class_init(ObjectClass *klass, void *data)
-{
-    DeviceClass *dc = DEVICE_CLASS(klass);
-    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
-
-    k->realize = ivshmem_doorbell_realize;
-    dc->props = ivshmem_doorbell_properties;
-    dc->vmsd = &ivshmem_doorbell_vmsd;
-}
-
-static const TypeInfo ivshmem_doorbell_info = {
-    .name          = TYPE_IVSHMEM_DOORBELL,
-    .parent        = TYPE_IVSHMEM_COMMON,
-    .instance_size = sizeof(IVShmemState),
-    .instance_init = ivshmem_doorbell_init,
-    .class_init    = ivshmem_doorbell_class_init,
-};
-
-static int ivshmem_load_old(QEMUFile *f, void *opaque, int version_id)
-{
-    IVShmemState *s = opaque;
-    PCIDevice *pdev = PCI_DEVICE(s);
-    int ret;
-
-    IVSHMEM_DPRINTF("ivshmem_load_old\n");
-
-    if (version_id != 0) {
-        return -EINVAL;
-    }
-
-    ret = ivshmem_pre_load(s);
-    if (ret) {
-        return ret;
-    }
-
-    ret = pci_device_load(pdev, f);
-    if (ret) {
-        return ret;
-    }
-
-    if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
-        msix_load(pdev, f);
-        ivshmem_msix_vector_use(s);
-    } else {
-        s->intrstatus = qemu_get_be32(f);
-        s->intrmask = qemu_get_be32(f);
-    }
-
-    return 0;
-}
-
-static bool test_msix(void *opaque, int version_id)
-{
-    IVShmemState *s = opaque;
-
-    return ivshmem_has_feature(s, IVSHMEM_MSI);
-}
-
-static bool test_no_msix(void *opaque, int version_id)
-{
-    return !test_msix(opaque, version_id);
-}
-
-static const VMStateDescription ivshmem_vmsd = {
-    .name = "ivshmem",
-    .version_id = 1,
-    .minimum_version_id = 1,
-    .pre_load = ivshmem_pre_load,
-    .post_load = ivshmem_post_load,
-    .fields = (VMStateField[]) {
-        VMSTATE_PCI_DEVICE(parent_obj, IVShmemState),
-
-        VMSTATE_MSIX_TEST(parent_obj, IVShmemState, test_msix),
-        VMSTATE_UINT32_TEST(intrstatus, IVShmemState, test_no_msix),
-        VMSTATE_UINT32_TEST(intrmask, IVShmemState, test_no_msix),
-
-        VMSTATE_END_OF_LIST()
-    },
-    .load_state_old = ivshmem_load_old,
-    .minimum_version_id_old = 0
-};
-
-static Property ivshmem_properties[] = {
-    DEFINE_PROP_CHR("chardev", IVShmemState, server_chr),
-    DEFINE_PROP_STRING("size", IVShmemState, sizearg),
-    DEFINE_PROP_UINT32("vectors", IVShmemState, vectors, 1),
-    DEFINE_PROP_BIT("ioeventfd", IVShmemState, features, IVSHMEM_IOEVENTFD,
-                    false),
-    DEFINE_PROP_BIT("msi", IVShmemState, features, IVSHMEM_MSI, true),
-    DEFINE_PROP_STRING("shm", IVShmemState, shmobj),
-    DEFINE_PROP_STRING("role", IVShmemState, role),
-    DEFINE_PROP_UINT32("use64", IVShmemState, not_legacy_32bit, 1),
-    DEFINE_PROP_END_OF_LIST(),
-};
-
-static void desugar_shm(IVShmemState *s)
-{
-    Object *obj;
-    char *path;
-
-    obj = object_new("memory-backend-file");
-    path = g_strdup_printf("/dev/shm/%s", s->shmobj);
-    object_property_set_str(obj, path, "mem-path", &error_abort);
-    g_free(path);
-    object_property_set_int(obj, s->legacy_size, "size", &error_abort);
-    object_property_set_bool(obj, true, "share", &error_abort);
-    object_property_add_child(OBJECT(s), "internal-shm-backend", obj,
-                              &error_abort);
-    user_creatable_complete(obj, &error_abort);
-    s->hostmem = MEMORY_BACKEND(obj);
-}
-
-static void ivshmem_realize(PCIDevice *dev, Error **errp)
-{
-    IVShmemState *s = IVSHMEM_COMMON(dev);
-
-    if (!qtest_enabled()) {
-        error_report("ivshmem is deprecated, please use ivshmem-plain"
-                     " or ivshmem-doorbell instead");
-    }
-
-    if (!!s->server_chr + !!s->shmobj != 1) {
-        error_setg(errp, "You must specify either 'shm' or 'chardev'");
-        return;
-    }
-
-    if (s->sizearg == NULL) {
-        s->legacy_size = 4 << 20; /* 4 MB default */
-    } else {
-        char *end;
-        int64_t size = qemu_strtosz(s->sizearg, &end);
-        if (size < 0 || (size_t)size != size || *end != '\0'
-            || !is_power_of_2(size)) {
-            error_setg(errp, "Invalid size %s", s->sizearg);
-            return;
-        }
-        s->legacy_size = size;
-    }
-
-    /* check that role is reasonable */
-    if (s->role) {
-        if (strncmp(s->role, "peer", 5) == 0) {
-            s->master = ON_OFF_AUTO_OFF;
-        } else if (strncmp(s->role, "master", 7) == 0) {
-            s->master = ON_OFF_AUTO_ON;
-        } else {
-            error_setg(errp, "'role' must be 'peer' or 'master'");
-            return;
-        }
-    } else {
-        s->master = ON_OFF_AUTO_AUTO;
-    }
-
-    if (s->shmobj) {
-        desugar_shm(s);
-    }
-
-    /*
-     * Note: we don't use INTx with IVSHMEM_MSI at all, so this is a
-     * bald-faced lie then.  But it's a backwards compatible lie.
-     */
-    pci_config_set_interrupt_pin(dev->config, 1);
-
-    ivshmem_common_realize(dev, errp);
-}
-
-static void ivshmem_class_init(ObjectClass *klass, void *data)
-{
-    DeviceClass *dc = DEVICE_CLASS(klass);
-    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
-
-    k->realize = ivshmem_realize;
-    k->revision = 0;
-    dc->desc = "Inter-VM shared memory (legacy)";
-    dc->props = ivshmem_properties;
-    dc->vmsd = &ivshmem_vmsd;
-}
-
-static const TypeInfo ivshmem_info = {
-    .name          = TYPE_IVSHMEM,
-    .parent        = TYPE_IVSHMEM_COMMON,
-    .instance_size = sizeof(IVShmemState),
-    .class_init    = ivshmem_class_init,
-};
-
-static void ivshmem_register_types(void)
-{
-    type_register_static(&ivshmem_common_info);
-    type_register_static(&ivshmem_plain_info);
-    type_register_static(&ivshmem_doorbell_info);
-    type_register_static(&ivshmem_info);
-}
-
-type_init(ivshmem_register_types)