/* * Inter-VM Shared Memory PCI device. * * Author: * Cam Macdonell * * 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/blocker.h" #include "qemu/error-report.h" #include "qemu/event_notifier.h" #include "qom/object_interfaces.h" #include "chardev/char.h" #include "sysemu/hostmem.h" #include "sysemu/qtest.h" #include "qapi/visitor.h" #include "hw/misc/ivshmem.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 */ CharBackend 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; } kvm_irqchip_commit_routes(kvm_state); 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); 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, vector, 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); memory_region_set_fd(&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); 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, Error **errp) { /* 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, errp)) { 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; Error *local_err = NULL; /* 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 { Chardev *chr = qemu_chr_fe_get_driver(&s->server_chr); assert(chr); IVSHMEM_DPRINTF("using shared memory server (socket = %s)\n", 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_fe_set_handlers(&s->server_chr, ivshmem_can_receive, ivshmem_read, NULL, s, NULL, true); if (ivshmem_setup_interrupts(s, errp) < 0) { error_prepend(errp, "Failed to initialize interrupts: "); return; } } 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, &local_err); if (local_err) { error_propagate(errp, local_err); error_free(s->migration_blocker); return; } } vmstate_register_ram(s->ivshmem_bar2, DEVICE(s)); pci_register_bar(PCI_DEVICE(s), 2, attr, s->ivshmem_bar2); } 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 = memory_region_get_fd(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) { if (host_memory_backend_is_mapped(MEMORY_BACKEND(val))) { 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); s->not_legacy_32bit = 1; } 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); host_memory_backend_set_mapped(s->hostmem, true); } static void ivshmem_plain_exit(PCIDevice *pci_dev) { IVShmemState *s = IVSHMEM_COMMON(pci_dev); host_memory_backend_set_mapped(s->hostmem, false); } 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; k->exit = ivshmem_plain_exit; 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 */ s->not_legacy_32bit = 1; } static void ivshmem_doorbell_realize(PCIDevice *dev, Error **errp) { IVShmemState *s = IVSHMEM_COMMON(dev); if (!qemu_chr_fe_get_driver(&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 (!!qemu_chr_fe_get_driver(&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 { int ret; uint64_t size; ret = qemu_strtosz_MiB(s->sizearg, NULL, &size); if (ret < 0 || (size_t)size != size || !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)