diff options
Diffstat (limited to 'qemu/hw/misc/ivshmem.c')
| -rw-r--r-- | qemu/hw/misc/ivshmem.c | 1323 |
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) |