/* * vhost-user * * Copyright (c) 2013 Virtual Open Systems Sarl. * * This work is licensed under the terms of the GNU GPL, version 2 or later. * See the COPYING file in the top-level directory. * */ #include "qemu/osdep.h" #include "qapi/error.h" #include "hw/virtio/vhost.h" #include "hw/virtio/vhost-user.h" #include "hw/virtio/vhost-backend.h" #include "hw/virtio/virtio.h" #include "hw/virtio/virtio-net.h" #include "chardev/char-fe.h" #include "io/channel-socket.h" #include "sysemu/kvm.h" #include "qemu/error-report.h" #include "qemu/main-loop.h" #include "qemu/sockets.h" #include "sysemu/runstate.h" #include "sysemu/cryptodev.h" #include "migration/migration.h" #include "migration/postcopy-ram.h" #include "trace.h" #include "exec/ramblock.h" #include #include #include #include "standard-headers/linux/vhost_types.h" #ifdef CONFIG_LINUX #include #endif #define VHOST_MEMORY_BASELINE_NREGIONS 8 #define VHOST_USER_F_PROTOCOL_FEATURES 30 #define VHOST_USER_SLAVE_MAX_FDS 8 /* * Set maximum number of RAM slots supported to * the maximum number supported by the target * hardware plaform. */ #if defined(TARGET_X86) || defined(TARGET_X86_64) || \ defined(TARGET_ARM) || defined(TARGET_ARM_64) #include "hw/acpi/acpi.h" #define VHOST_USER_MAX_RAM_SLOTS ACPI_MAX_RAM_SLOTS #elif defined(TARGET_PPC) || defined(TARGET_PPC64) #include "hw/ppc/spapr.h" #define VHOST_USER_MAX_RAM_SLOTS SPAPR_MAX_RAM_SLOTS #else #define VHOST_USER_MAX_RAM_SLOTS 512 #endif /* * Maximum size of virtio device config space */ #define VHOST_USER_MAX_CONFIG_SIZE 256 enum VhostUserProtocolFeature { VHOST_USER_PROTOCOL_F_MQ = 0, VHOST_USER_PROTOCOL_F_LOG_SHMFD = 1, VHOST_USER_PROTOCOL_F_RARP = 2, VHOST_USER_PROTOCOL_F_REPLY_ACK = 3, VHOST_USER_PROTOCOL_F_NET_MTU = 4, VHOST_USER_PROTOCOL_F_SLAVE_REQ = 5, VHOST_USER_PROTOCOL_F_CROSS_ENDIAN = 6, VHOST_USER_PROTOCOL_F_CRYPTO_SESSION = 7, VHOST_USER_PROTOCOL_F_PAGEFAULT = 8, VHOST_USER_PROTOCOL_F_CONFIG = 9, VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD = 10, VHOST_USER_PROTOCOL_F_HOST_NOTIFIER = 11, VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD = 12, VHOST_USER_PROTOCOL_F_RESET_DEVICE = 13, /* Feature 14 reserved for VHOST_USER_PROTOCOL_F_INBAND_NOTIFICATIONS. */ VHOST_USER_PROTOCOL_F_CONFIGURE_MEM_SLOTS = 15, VHOST_USER_PROTOCOL_F_STATUS = 16, VHOST_USER_PROTOCOL_F_MAX }; #define VHOST_USER_PROTOCOL_FEATURE_MASK ((1 << VHOST_USER_PROTOCOL_F_MAX) - 1) typedef enum VhostUserRequest { VHOST_USER_NONE = 0, VHOST_USER_GET_FEATURES = 1, VHOST_USER_SET_FEATURES = 2, VHOST_USER_SET_OWNER = 3, VHOST_USER_RESET_OWNER = 4, VHOST_USER_SET_MEM_TABLE = 5, VHOST_USER_SET_LOG_BASE = 6, VHOST_USER_SET_LOG_FD = 7, VHOST_USER_SET_VRING_NUM = 8, VHOST_USER_SET_VRING_ADDR = 9, VHOST_USER_SET_VRING_BASE = 10, VHOST_USER_GET_VRING_BASE = 11, VHOST_USER_SET_VRING_KICK = 12, VHOST_USER_SET_VRING_CALL = 13, VHOST_USER_SET_VRING_ERR = 14, VHOST_USER_GET_PROTOCOL_FEATURES = 15, VHOST_USER_SET_PROTOCOL_FEATURES = 16, VHOST_USER_GET_QUEUE_NUM = 17, VHOST_USER_SET_VRING_ENABLE = 18, VHOST_USER_SEND_RARP = 19, VHOST_USER_NET_SET_MTU = 20, VHOST_USER_SET_SLAVE_REQ_FD = 21, VHOST_USER_IOTLB_MSG = 22, VHOST_USER_SET_VRING_ENDIAN = 23, VHOST_USER_GET_CONFIG = 24, VHOST_USER_SET_CONFIG = 25, VHOST_USER_CREATE_CRYPTO_SESSION = 26, VHOST_USER_CLOSE_CRYPTO_SESSION = 27, VHOST_USER_POSTCOPY_ADVISE = 28, VHOST_USER_POSTCOPY_LISTEN = 29, VHOST_USER_POSTCOPY_END = 30, VHOST_USER_GET_INFLIGHT_FD = 31, VHOST_USER_SET_INFLIGHT_FD = 32, VHOST_USER_GPU_SET_SOCKET = 33, VHOST_USER_RESET_DEVICE = 34, /* Message number 35 reserved for VHOST_USER_VRING_KICK. */ VHOST_USER_GET_MAX_MEM_SLOTS = 36, VHOST_USER_ADD_MEM_REG = 37, VHOST_USER_REM_MEM_REG = 38, VHOST_USER_SET_STATUS = 39, VHOST_USER_GET_STATUS = 40, VHOST_USER_MAX } VhostUserRequest; typedef enum VhostUserSlaveRequest { VHOST_USER_SLAVE_NONE = 0, VHOST_USER_SLAVE_IOTLB_MSG = 1, VHOST_USER_SLAVE_CONFIG_CHANGE_MSG = 2, VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG = 3, VHOST_USER_SLAVE_MAX } VhostUserSlaveRequest; typedef struct VhostUserMemoryRegion { uint64_t guest_phys_addr; uint64_t memory_size; uint64_t userspace_addr; uint64_t mmap_offset; } VhostUserMemoryRegion; typedef struct VhostUserMemory { uint32_t nregions; uint32_t padding; VhostUserMemoryRegion regions[VHOST_MEMORY_BASELINE_NREGIONS]; } VhostUserMemory; typedef struct VhostUserMemRegMsg { uint64_t padding; VhostUserMemoryRegion region; } VhostUserMemRegMsg; typedef struct VhostUserLog { uint64_t mmap_size; uint64_t mmap_offset; } VhostUserLog; typedef struct VhostUserConfig { uint32_t offset; uint32_t size; uint32_t flags; uint8_t region[VHOST_USER_MAX_CONFIG_SIZE]; } VhostUserConfig; #define VHOST_CRYPTO_SYM_HMAC_MAX_KEY_LEN 512 #define VHOST_CRYPTO_SYM_CIPHER_MAX_KEY_LEN 64 typedef struct VhostUserCryptoSession { /* session id for success, -1 on errors */ int64_t session_id; CryptoDevBackendSymSessionInfo session_setup_data; uint8_t key[VHOST_CRYPTO_SYM_CIPHER_MAX_KEY_LEN]; uint8_t auth_key[VHOST_CRYPTO_SYM_HMAC_MAX_KEY_LEN]; } VhostUserCryptoSession; static VhostUserConfig c __attribute__ ((unused)); #define VHOST_USER_CONFIG_HDR_SIZE (sizeof(c.offset) \ + sizeof(c.size) \ + sizeof(c.flags)) typedef struct VhostUserVringArea { uint64_t u64; uint64_t size; uint64_t offset; } VhostUserVringArea; typedef struct VhostUserInflight { uint64_t mmap_size; uint64_t mmap_offset; uint16_t num_queues; uint16_t queue_size; } VhostUserInflight; typedef struct { VhostUserRequest request; #define VHOST_USER_VERSION_MASK (0x3) #define VHOST_USER_REPLY_MASK (0x1 << 2) #define VHOST_USER_NEED_REPLY_MASK (0x1 << 3) uint32_t flags; uint32_t size; /* the following payload size */ } QEMU_PACKED VhostUserHeader; typedef union { #define VHOST_USER_VRING_IDX_MASK (0xff) #define VHOST_USER_VRING_NOFD_MASK (0x1 << 8) uint64_t u64; struct vhost_vring_state state; struct vhost_vring_addr addr; VhostUserMemory memory; VhostUserMemRegMsg mem_reg; VhostUserLog log; struct vhost_iotlb_msg iotlb; VhostUserConfig config; VhostUserCryptoSession session; VhostUserVringArea area; VhostUserInflight inflight; } VhostUserPayload; typedef struct VhostUserMsg { VhostUserHeader hdr; VhostUserPayload payload; } QEMU_PACKED VhostUserMsg; static VhostUserMsg m __attribute__ ((unused)); #define VHOST_USER_HDR_SIZE (sizeof(VhostUserHeader)) #define VHOST_USER_PAYLOAD_SIZE (sizeof(VhostUserPayload)) /* The version of the protocol we support */ #define VHOST_USER_VERSION (0x1) struct vhost_user { struct vhost_dev *dev; /* Shared between vhost devs of the same virtio device */ VhostUserState *user; QIOChannel *slave_ioc; GSource *slave_src; NotifierWithReturn postcopy_notifier; struct PostCopyFD postcopy_fd; uint64_t postcopy_client_bases[VHOST_USER_MAX_RAM_SLOTS]; /* Length of the region_rb and region_rb_offset arrays */ size_t region_rb_len; /* RAMBlock associated with a given region */ RAMBlock **region_rb; /* * The offset from the start of the RAMBlock to the start of the * vhost region. */ ram_addr_t *region_rb_offset; /* True once we've entered postcopy_listen */ bool postcopy_listen; /* Our current regions */ int num_shadow_regions; struct vhost_memory_region shadow_regions[VHOST_USER_MAX_RAM_SLOTS]; }; struct scrub_regions { struct vhost_memory_region *region; int reg_idx; int fd_idx; }; static bool ioeventfd_enabled(void) { return !kvm_enabled() || kvm_eventfds_enabled(); } static int vhost_user_read_header(struct vhost_dev *dev, VhostUserMsg *msg) { struct vhost_user *u = dev->opaque; CharBackend *chr = u->user->chr; uint8_t *p = (uint8_t *) msg; int r, size = VHOST_USER_HDR_SIZE; r = qemu_chr_fe_read_all(chr, p, size); if (r != size) { int saved_errno = errno; error_report("Failed to read msg header. Read %d instead of %d." " Original request %d.", r, size, msg->hdr.request); return r < 0 ? -saved_errno : -EIO; } /* validate received flags */ if (msg->hdr.flags != (VHOST_USER_REPLY_MASK | VHOST_USER_VERSION)) { error_report("Failed to read msg header." " Flags 0x%x instead of 0x%x.", msg->hdr.flags, VHOST_USER_REPLY_MASK | VHOST_USER_VERSION); return -EPROTO; } trace_vhost_user_read(msg->hdr.request, msg->hdr.flags); return 0; } struct vhost_user_read_cb_data { struct vhost_dev *dev; VhostUserMsg *msg; GMainLoop *loop; int ret; }; static gboolean vhost_user_read_cb(void *do_not_use, GIOCondition condition, gpointer opaque) { struct vhost_user_read_cb_data *data = opaque; struct vhost_dev *dev = data->dev; VhostUserMsg *msg = data->msg; struct vhost_user *u = dev->opaque; CharBackend *chr = u->user->chr; uint8_t *p = (uint8_t *) msg; int r, size; r = vhost_user_read_header(dev, msg); if (r < 0) { data->ret = r; goto end; } /* validate message size is sane */ if (msg->hdr.size > VHOST_USER_PAYLOAD_SIZE) { error_report("Failed to read msg header." " Size %d exceeds the maximum %zu.", msg->hdr.size, VHOST_USER_PAYLOAD_SIZE); data->ret = -EPROTO; goto end; } if (msg->hdr.size) { p += VHOST_USER_HDR_SIZE; size = msg->hdr.size; r = qemu_chr_fe_read_all(chr, p, size); if (r != size) { int saved_errno = errno; error_report("Failed to read msg payload." " Read %d instead of %d.", r, msg->hdr.size); data->ret = r < 0 ? -saved_errno : -EIO; goto end; } } end: g_main_loop_quit(data->loop); return G_SOURCE_REMOVE; } static gboolean slave_read(QIOChannel *ioc, GIOCondition condition, gpointer opaque); /* * This updates the read handler to use a new event loop context. * Event sources are removed from the previous context : this ensures * that events detected in the previous context are purged. They will * be re-detected and processed in the new context. */ static void slave_update_read_handler(struct vhost_dev *dev, GMainContext *ctxt) { struct vhost_user *u = dev->opaque; if (!u->slave_ioc) { return; } if (u->slave_src) { g_source_destroy(u->slave_src); g_source_unref(u->slave_src); } u->slave_src = qio_channel_add_watch_source(u->slave_ioc, G_IO_IN | G_IO_HUP, slave_read, dev, NULL, ctxt); } static int vhost_user_read(struct vhost_dev *dev, VhostUserMsg *msg) { struct vhost_user *u = dev->opaque; CharBackend *chr = u->user->chr; GMainContext *prev_ctxt = chr->chr->gcontext; GMainContext *ctxt = g_main_context_new(); GMainLoop *loop = g_main_loop_new(ctxt, FALSE); struct vhost_user_read_cb_data data = { .dev = dev, .loop = loop, .msg = msg, .ret = 0 }; /* * We want to be able to monitor the slave channel fd while waiting * for chr I/O. This requires an event loop, but we can't nest the * one to which chr is currently attached : its fd handlers might not * be prepared for re-entrancy. So we create a new one and switch chr * to use it. */ slave_update_read_handler(dev, ctxt); qemu_chr_be_update_read_handlers(chr->chr, ctxt); qemu_chr_fe_add_watch(chr, G_IO_IN | G_IO_HUP, vhost_user_read_cb, &data); g_main_loop_run(loop); /* * Restore the previous event loop context. This also destroys/recreates * event sources : this guarantees that all pending events in the original * context that have been processed by the nested loop are purged. */ qemu_chr_be_update_read_handlers(chr->chr, prev_ctxt); slave_update_read_handler(dev, NULL); g_main_loop_unref(loop); g_main_context_unref(ctxt); return data.ret; } static int process_message_reply(struct vhost_dev *dev, const VhostUserMsg *msg) { int ret; VhostUserMsg msg_reply; if ((msg->hdr.flags & VHOST_USER_NEED_REPLY_MASK) == 0) { return 0; } ret = vhost_user_read(dev, &msg_reply); if (ret < 0) { return ret; } if (msg_reply.hdr.request != msg->hdr.request) { error_report("Received unexpected msg type. " "Expected %d received %d", msg->hdr.request, msg_reply.hdr.request); return -EPROTO; } return msg_reply.payload.u64 ? -EIO : 0; } static bool vhost_user_one_time_request(VhostUserRequest request) { switch (request) { case VHOST_USER_SET_OWNER: case VHOST_USER_RESET_OWNER: case VHOST_USER_SET_MEM_TABLE: case VHOST_USER_GET_QUEUE_NUM: case VHOST_USER_NET_SET_MTU: return true; default: return false; } } /* most non-init callers ignore the error */ static int vhost_user_write(struct vhost_dev *dev, VhostUserMsg *msg, int *fds, int fd_num) { struct vhost_user *u = dev->opaque; CharBackend *chr = u->user->chr; int ret, size = VHOST_USER_HDR_SIZE + msg->hdr.size; /* * For non-vring specific requests, like VHOST_USER_SET_MEM_TABLE, * we just need send it once in the first time. For later such * request, we just ignore it. */ if (vhost_user_one_time_request(msg->hdr.request) && dev->vq_index != 0) { msg->hdr.flags &= ~VHOST_USER_NEED_REPLY_MASK; return 0; } if (qemu_chr_fe_set_msgfds(chr, fds, fd_num) < 0) { error_report("Failed to set msg fds."); return -EINVAL; } ret = qemu_chr_fe_write_all(chr, (const uint8_t *) msg, size); if (ret != size) { int saved_errno = errno; error_report("Failed to write msg." " Wrote %d instead of %d.", ret, size); return ret < 0 ? -saved_errno : -EIO; } trace_vhost_user_write(msg->hdr.request, msg->hdr.flags); return 0; } int vhost_user_gpu_set_socket(struct vhost_dev *dev, int fd) { VhostUserMsg msg = { .hdr.request = VHOST_USER_GPU_SET_SOCKET, .hdr.flags = VHOST_USER_VERSION, }; return vhost_user_write(dev, &msg, &fd, 1); } static int vhost_user_set_log_base(struct vhost_dev *dev, uint64_t base, struct vhost_log *log) { int fds[VHOST_USER_MAX_RAM_SLOTS]; size_t fd_num = 0; bool shmfd = virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_LOG_SHMFD); int ret; VhostUserMsg msg = { .hdr.request = VHOST_USER_SET_LOG_BASE, .hdr.flags = VHOST_USER_VERSION, .payload.log.mmap_size = log->size * sizeof(*(log->log)), .payload.log.mmap_offset = 0, .hdr.size = sizeof(msg.payload.log), }; if (shmfd && log->fd != -1) { fds[fd_num++] = log->fd; } ret = vhost_user_write(dev, &msg, fds, fd_num); if (ret < 0) { return ret; } if (shmfd) { msg.hdr.size = 0; ret = vhost_user_read(dev, &msg); if (ret < 0) { return ret; } if (msg.hdr.request != VHOST_USER_SET_LOG_BASE) { error_report("Received unexpected msg type. " "Expected %d received %d", VHOST_USER_SET_LOG_BASE, msg.hdr.request); return -EPROTO; } } return 0; } static MemoryRegion *vhost_user_get_mr_data(uint64_t addr, ram_addr_t *offset, int *fd) { MemoryRegion *mr; assert((uintptr_t)addr == addr); mr = memory_region_from_host((void *)(uintptr_t)addr, offset); *fd = memory_region_get_fd(mr); return mr; } static void vhost_user_fill_msg_region(VhostUserMemoryRegion *dst, struct vhost_memory_region *src, uint64_t mmap_offset) { assert(src != NULL && dst != NULL); dst->userspace_addr = src->userspace_addr; dst->memory_size = src->memory_size; dst->guest_phys_addr = src->guest_phys_addr; dst->mmap_offset = mmap_offset; } static int vhost_user_fill_set_mem_table_msg(struct vhost_user *u, struct vhost_dev *dev, VhostUserMsg *msg, int *fds, size_t *fd_num, bool track_ramblocks) { int i, fd; ram_addr_t offset; MemoryRegion *mr; struct vhost_memory_region *reg; VhostUserMemoryRegion region_buffer; msg->hdr.request = VHOST_USER_SET_MEM_TABLE; for (i = 0; i < dev->mem->nregions; ++i) { reg = dev->mem->regions + i; mr = vhost_user_get_mr_data(reg->userspace_addr, &offset, &fd); if (fd > 0) { if (track_ramblocks) { assert(*fd_num < VHOST_MEMORY_BASELINE_NREGIONS); trace_vhost_user_set_mem_table_withfd(*fd_num, mr->name, reg->memory_size, reg->guest_phys_addr, reg->userspace_addr, offset); u->region_rb_offset[i] = offset; u->region_rb[i] = mr->ram_block; } else if (*fd_num == VHOST_MEMORY_BASELINE_NREGIONS) { error_report("Failed preparing vhost-user memory table msg"); return -ENOBUFS; } vhost_user_fill_msg_region(®ion_buffer, reg, offset); msg->payload.memory.regions[*fd_num] = region_buffer; fds[(*fd_num)++] = fd; } else if (track_ramblocks) { u->region_rb_offset[i] = 0; u->region_rb[i] = NULL; } } msg->payload.memory.nregions = *fd_num; if (!*fd_num) { error_report("Failed initializing vhost-user memory map, " "consider using -object memory-backend-file share=on"); return -EINVAL; } msg->hdr.size = sizeof(msg->payload.memory.nregions); msg->hdr.size += sizeof(msg->payload.memory.padding); msg->hdr.size += *fd_num * sizeof(VhostUserMemoryRegion); return 0; } static inline bool reg_equal(struct vhost_memory_region *shadow_reg, struct vhost_memory_region *vdev_reg) { return shadow_reg->guest_phys_addr == vdev_reg->guest_phys_addr && shadow_reg->userspace_addr == vdev_reg->userspace_addr && shadow_reg->memory_size == vdev_reg->memory_size; } static void scrub_shadow_regions(struct vhost_dev *dev, struct scrub_regions *add_reg, int *nr_add_reg, struct scrub_regions *rem_reg, int *nr_rem_reg, uint64_t *shadow_pcb, bool track_ramblocks) { struct vhost_user *u = dev->opaque; bool found[VHOST_USER_MAX_RAM_SLOTS] = {}; struct vhost_memory_region *reg, *shadow_reg; int i, j, fd, add_idx = 0, rm_idx = 0, fd_num = 0; ram_addr_t offset; MemoryRegion *mr; bool matching; /* * Find memory regions present in our shadow state which are not in * the device's current memory state. * * Mark regions in both the shadow and device state as "found". */ for (i = 0; i < u->num_shadow_regions; i++) { shadow_reg = &u->shadow_regions[i]; matching = false; for (j = 0; j < dev->mem->nregions; j++) { reg = &dev->mem->regions[j]; mr = vhost_user_get_mr_data(reg->userspace_addr, &offset, &fd); if (reg_equal(shadow_reg, reg)) { matching = true; found[j] = true; if (track_ramblocks) { /* * Reset postcopy client bases, region_rb, and * region_rb_offset in case regions are removed. */ if (fd > 0) { u->region_rb_offset[j] = offset; u->region_rb[j] = mr->ram_block; shadow_pcb[j] = u->postcopy_client_bases[i]; } else { u->region_rb_offset[j] = 0; u->region_rb[j] = NULL; } } break; } } /* * If the region was not found in the current device memory state * create an entry for it in the removed list. */ if (!matching) { rem_reg[rm_idx].region = shadow_reg; rem_reg[rm_idx++].reg_idx = i; } } /* * For regions not marked "found", create entries in the added list. * * Note their indexes in the device memory state and the indexes of their * file descriptors. */ for (i = 0; i < dev->mem->nregions; i++) { reg = &dev->mem->regions[i]; vhost_user_get_mr_data(reg->userspace_addr, &offset, &fd); if (fd > 0) { ++fd_num; } /* * If the region was in both the shadow and device state we don't * need to send a VHOST_USER_ADD_MEM_REG message for it. */ if (found[i]) { continue; } add_reg[add_idx].region = reg; add_reg[add_idx].reg_idx = i; add_reg[add_idx++].fd_idx = fd_num; } *nr_rem_reg = rm_idx; *nr_add_reg = add_idx; return; } static int send_remove_regions(struct vhost_dev *dev, struct scrub_regions *remove_reg, int nr_rem_reg, VhostUserMsg *msg, bool reply_supported) { struct vhost_user *u = dev->opaque; struct vhost_memory_region *shadow_reg; int i, fd, shadow_reg_idx, ret; ram_addr_t offset; VhostUserMemoryRegion region_buffer; /* * The regions in remove_reg appear in the same order they do in the * shadow table. Therefore we can minimize memory copies by iterating * through remove_reg backwards. */ for (i = nr_rem_reg - 1; i >= 0; i--) { shadow_reg = remove_reg[i].region; shadow_reg_idx = remove_reg[i].reg_idx; vhost_user_get_mr_data(shadow_reg->userspace_addr, &offset, &fd); if (fd > 0) { msg->hdr.request = VHOST_USER_REM_MEM_REG; vhost_user_fill_msg_region(®ion_buffer, shadow_reg, 0); msg->payload.mem_reg.region = region_buffer; ret = vhost_user_write(dev, msg, NULL, 0); if (ret < 0) { return ret; } if (reply_supported) { ret = process_message_reply(dev, msg); if (ret) { return ret; } } } /* * At this point we know the backend has unmapped the region. It is now * safe to remove it from the shadow table. */ memmove(&u->shadow_regions[shadow_reg_idx], &u->shadow_regions[shadow_reg_idx + 1], sizeof(struct vhost_memory_region) * (u->num_shadow_regions - shadow_reg_idx - 1)); u->num_shadow_regions--; } return 0; } static int send_add_regions(struct vhost_dev *dev, struct scrub_regions *add_reg, int nr_add_reg, VhostUserMsg *msg, uint64_t *shadow_pcb, bool reply_supported, bool track_ramblocks) { struct vhost_user *u = dev->opaque; int i, fd, ret, reg_idx, reg_fd_idx; struct vhost_memory_region *reg; MemoryRegion *mr; ram_addr_t offset; VhostUserMsg msg_reply; VhostUserMemoryRegion region_buffer; for (i = 0; i < nr_add_reg; i++) { reg = add_reg[i].region; reg_idx = add_reg[i].reg_idx; reg_fd_idx = add_reg[i].fd_idx; mr = vhost_user_get_mr_data(reg->userspace_addr, &offset, &fd); if (fd > 0) { if (track_ramblocks) { trace_vhost_user_set_mem_table_withfd(reg_fd_idx, mr->name, reg->memory_size, reg->guest_phys_addr, reg->userspace_addr, offset); u->region_rb_offset[reg_idx] = offset; u->region_rb[reg_idx] = mr->ram_block; } msg->hdr.request = VHOST_USER_ADD_MEM_REG; vhost_user_fill_msg_region(®ion_buffer, reg, offset); msg->payload.mem_reg.region = region_buffer; ret = vhost_user_write(dev, msg, &fd, 1); if (ret < 0) { return ret; } if (track_ramblocks) { uint64_t reply_gpa; ret = vhost_user_read(dev, &msg_reply); if (ret < 0) { return ret; } reply_gpa = msg_reply.payload.mem_reg.region.guest_phys_addr; if (msg_reply.hdr.request != VHOST_USER_ADD_MEM_REG) { error_report("%s: Received unexpected msg type." "Expected %d received %d", __func__, VHOST_USER_ADD_MEM_REG, msg_reply.hdr.request); return -EPROTO; } /* * We're using the same structure, just reusing one of the * fields, so it should be the same size. */ if (msg_reply.hdr.size != msg->hdr.size) { error_report("%s: Unexpected size for postcopy reply " "%d vs %d", __func__, msg_reply.hdr.size, msg->hdr.size); return -EPROTO; } /* Get the postcopy client base from the backend's reply. */ if (reply_gpa == dev->mem->regions[reg_idx].guest_phys_addr) { shadow_pcb[reg_idx] = msg_reply.payload.mem_reg.region.userspace_addr; trace_vhost_user_set_mem_table_postcopy( msg_reply.payload.mem_reg.region.userspace_addr, msg->payload.mem_reg.region.userspace_addr, reg_fd_idx, reg_idx); } else { error_report("%s: invalid postcopy reply for region. " "Got guest physical address %" PRIX64 ", expected " "%" PRIX64, __func__, reply_gpa, dev->mem->regions[reg_idx].guest_phys_addr); return -EPROTO; } } else if (reply_supported) { ret = process_message_reply(dev, msg); if (ret) { return ret; } } } else if (track_ramblocks) { u->region_rb_offset[reg_idx] = 0; u->region_rb[reg_idx] = NULL; } /* * At this point, we know the backend has mapped in the new * region, if the region has a valid file descriptor. * * The region should now be added to the shadow table. */ u->shadow_regions[u->num_shadow_regions].guest_phys_addr = reg->guest_phys_addr; u->shadow_regions[u->num_shadow_regions].userspace_addr = reg->userspace_addr; u->shadow_regions[u->num_shadow_regions].memory_size = reg->memory_size; u->num_shadow_regions++; } return 0; } static int vhost_user_add_remove_regions(struct vhost_dev *dev, VhostUserMsg *msg, bool reply_supported, bool track_ramblocks) { struct vhost_user *u = dev->opaque; struct scrub_regions add_reg[VHOST_USER_MAX_RAM_SLOTS]; struct scrub_regions rem_reg[VHOST_USER_MAX_RAM_SLOTS]; uint64_t shadow_pcb[VHOST_USER_MAX_RAM_SLOTS] = {}; int nr_add_reg, nr_rem_reg; int ret; msg->hdr.size = sizeof(msg->payload.mem_reg); /* Find the regions which need to be removed or added. */ scrub_shadow_regions(dev, add_reg, &nr_add_reg, rem_reg, &nr_rem_reg, shadow_pcb, track_ramblocks); if (nr_rem_reg) { ret = send_remove_regions(dev, rem_reg, nr_rem_reg, msg, reply_supported); if (ret < 0) { goto err; } } if (nr_add_reg) { ret = send_add_regions(dev, add_reg, nr_add_reg, msg, shadow_pcb, reply_supported, track_ramblocks); if (ret < 0) { goto err; } } if (track_ramblocks) { memcpy(u->postcopy_client_bases, shadow_pcb, sizeof(uint64_t) * VHOST_USER_MAX_RAM_SLOTS); /* * Now we've registered this with the postcopy code, we ack to the * client, because now we're in the position to be able to deal with * any faults it generates. */ /* TODO: Use this for failure cases as well with a bad value. */ msg->hdr.size = sizeof(msg->payload.u64); msg->payload.u64 = 0; /* OK */ ret = vhost_user_write(dev, msg, NULL, 0); if (ret < 0) { return ret; } } return 0; err: if (track_ramblocks) { memcpy(u->postcopy_client_bases, shadow_pcb, sizeof(uint64_t) * VHOST_USER_MAX_RAM_SLOTS); } return ret; } static int vhost_user_set_mem_table_postcopy(struct vhost_dev *dev, struct vhost_memory *mem, bool reply_supported, bool config_mem_slots) { struct vhost_user *u = dev->opaque; int fds[VHOST_MEMORY_BASELINE_NREGIONS]; size_t fd_num = 0; VhostUserMsg msg_reply; int region_i, msg_i; int ret; VhostUserMsg msg = { .hdr.flags = VHOST_USER_VERSION, }; if (u->region_rb_len < dev->mem->nregions) { u->region_rb = g_renew(RAMBlock*, u->region_rb, dev->mem->nregions); u->region_rb_offset = g_renew(ram_addr_t, u->region_rb_offset, dev->mem->nregions); memset(&(u->region_rb[u->region_rb_len]), '\0', sizeof(RAMBlock *) * (dev->mem->nregions - u->region_rb_len)); memset(&(u->region_rb_offset[u->region_rb_len]), '\0', sizeof(ram_addr_t) * (dev->mem->nregions - u->region_rb_len)); u->region_rb_len = dev->mem->nregions; } if (config_mem_slots) { ret = vhost_user_add_remove_regions(dev, &msg, reply_supported, true); if (ret < 0) { return ret; } } else { ret = vhost_user_fill_set_mem_table_msg(u, dev, &msg, fds, &fd_num, true); if (ret < 0) { return ret; } ret = vhost_user_write(dev, &msg, fds, fd_num); if (ret < 0) { return ret; } ret = vhost_user_read(dev, &msg_reply); if (ret < 0) { return ret; } if (msg_reply.hdr.request != VHOST_USER_SET_MEM_TABLE) { error_report("%s: Received unexpected msg type." "Expected %d received %d", __func__, VHOST_USER_SET_MEM_TABLE, msg_reply.hdr.request); return -EPROTO; } /* * We're using the same structure, just reusing one of the * fields, so it should be the same size. */ if (msg_reply.hdr.size != msg.hdr.size) { error_report("%s: Unexpected size for postcopy reply " "%d vs %d", __func__, msg_reply.hdr.size, msg.hdr.size); return -EPROTO; } memset(u->postcopy_client_bases, 0, sizeof(uint64_t) * VHOST_USER_MAX_RAM_SLOTS); /* * They're in the same order as the regions that were sent * but some of the regions were skipped (above) if they * didn't have fd's */ for (msg_i = 0, region_i = 0; region_i < dev->mem->nregions; region_i++) { if (msg_i < fd_num && msg_reply.payload.memory.regions[msg_i].guest_phys_addr == dev->mem->regions[region_i].guest_phys_addr) { u->postcopy_client_bases[region_i] = msg_reply.payload.memory.regions[msg_i].userspace_addr; trace_vhost_user_set_mem_table_postcopy( msg_reply.payload.memory.regions[msg_i].userspace_addr, msg.payload.memory.regions[msg_i].userspace_addr, msg_i, region_i); msg_i++; } } if (msg_i != fd_num) { error_report("%s: postcopy reply not fully consumed " "%d vs %zd", __func__, msg_i, fd_num); return -EIO; } /* * Now we've registered this with the postcopy code, we ack to the * client, because now we're in the position to be able to deal * with any faults it generates. */ /* TODO: Use this for failure cases as well with a bad value. */ msg.hdr.size = sizeof(msg.payload.u64); msg.payload.u64 = 0; /* OK */ ret = vhost_user_write(dev, &msg, NULL, 0); if (ret < 0) { return ret; } } return 0; } static int vhost_user_set_mem_table(struct vhost_dev *dev, struct vhost_memory *mem) { struct vhost_user *u = dev->opaque; int fds[VHOST_MEMORY_BASELINE_NREGIONS]; size_t fd_num = 0; bool do_postcopy = u->postcopy_listen && u->postcopy_fd.handler; bool reply_supported = virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_REPLY_ACK); bool config_mem_slots = virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_CONFIGURE_MEM_SLOTS); int ret; if (do_postcopy) { /* * Postcopy has enough differences that it's best done in it's own * version */ return vhost_user_set_mem_table_postcopy(dev, mem, reply_supported, config_mem_slots); } VhostUserMsg msg = { .hdr.flags = VHOST_USER_VERSION, }; if (reply_supported) { msg.hdr.flags |= VHOST_USER_NEED_REPLY_MASK; } if (config_mem_slots) { ret = vhost_user_add_remove_regions(dev, &msg, reply_supported, false); if (ret < 0) { return ret; } } else { ret = vhost_user_fill_set_mem_table_msg(u, dev, &msg, fds, &fd_num, false); if (ret < 0) { return ret; } ret = vhost_user_write(dev, &msg, fds, fd_num); if (ret < 0) { return ret; } if (reply_supported) { return process_message_reply(dev, &msg); } } return 0; } static int vhost_user_set_vring_endian(struct vhost_dev *dev, struct vhost_vring_state *ring) { bool cross_endian = virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_CROSS_ENDIAN); VhostUserMsg msg = { .hdr.request = VHOST_USER_SET_VRING_ENDIAN, .hdr.flags = VHOST_USER_VERSION, .payload.state = *ring, .hdr.size = sizeof(msg.payload.state), }; if (!cross_endian) { error_report("vhost-user trying to send unhandled ioctl"); return -ENOTSUP; } return vhost_user_write(dev, &msg, NULL, 0); } static int vhost_set_vring(struct vhost_dev *dev, unsigned long int request, struct vhost_vring_state *ring) { VhostUserMsg msg = { .hdr.request = request, .hdr.flags = VHOST_USER_VERSION, .payload.state = *ring, .hdr.size = sizeof(msg.payload.state), }; return vhost_user_write(dev, &msg, NULL, 0); } static int vhost_user_set_vring_num(struct vhost_dev *dev, struct vhost_vring_state *ring) { return vhost_set_vring(dev, VHOST_USER_SET_VRING_NUM, ring); } static void vhost_user_host_notifier_free(VhostUserHostNotifier *n) { assert(n && n->unmap_addr); munmap(n->unmap_addr, qemu_real_host_page_size()); n->unmap_addr = NULL; } /* * clean-up function for notifier, will finally free the structure * under rcu. */ static void vhost_user_host_notifier_remove(VhostUserHostNotifier *n, VirtIODevice *vdev) { if (n->addr) { if (vdev) { virtio_queue_set_host_notifier_mr(vdev, n->idx, &n->mr, false); } assert(!n->unmap_addr); n->unmap_addr = n->addr; n->addr = NULL; call_rcu(n, vhost_user_host_notifier_free, rcu); } } static int vhost_user_set_vring_base(struct vhost_dev *dev, struct vhost_vring_state *ring) { return vhost_set_vring(dev, VHOST_USER_SET_VRING_BASE, ring); } static int vhost_user_set_vring_enable(struct vhost_dev *dev, int enable) { int i; if (!virtio_has_feature(dev->features, VHOST_USER_F_PROTOCOL_FEATURES)) { return -EINVAL; } for (i = 0; i < dev->nvqs; ++i) { int ret; struct vhost_vring_state state = { .index = dev->vq_index + i, .num = enable, }; ret = vhost_set_vring(dev, VHOST_USER_SET_VRING_ENABLE, &state); if (ret < 0) { /* * Restoring the previous state is likely infeasible, as well as * proceeding regardless the error, so just bail out and hope for * the device-level recovery. */ return ret; } } return 0; } static VhostUserHostNotifier *fetch_notifier(VhostUserState *u, int idx) { if (idx >= u->notifiers->len) { return NULL; } return g_ptr_array_index(u->notifiers, idx); } static int vhost_user_get_vring_base(struct vhost_dev *dev, struct vhost_vring_state *ring) { int ret; VhostUserMsg msg = { .hdr.request = VHOST_USER_GET_VRING_BASE, .hdr.flags = VHOST_USER_VERSION, .payload.state = *ring, .hdr.size = sizeof(msg.payload.state), }; struct vhost_user *u = dev->opaque; VhostUserHostNotifier *n = fetch_notifier(u->user, ring->index); if (n) { vhost_user_host_notifier_remove(n, dev->vdev); } ret = vhost_user_write(dev, &msg, NULL, 0); if (ret < 0) { return ret; } ret = vhost_user_read(dev, &msg); if (ret < 0) { return ret; } if (msg.hdr.request != VHOST_USER_GET_VRING_BASE) { error_report("Received unexpected msg type. Expected %d received %d", VHOST_USER_GET_VRING_BASE, msg.hdr.request); return -EPROTO; } if (msg.hdr.size != sizeof(msg.payload.state)) { error_report("Received bad msg size."); return -EPROTO; } *ring = msg.payload.state; return 0; } static int vhost_set_vring_file(struct vhost_dev *dev, VhostUserRequest request, struct vhost_vring_file *file) { int fds[VHOST_USER_MAX_RAM_SLOTS]; size_t fd_num = 0; VhostUserMsg msg = { .hdr.request = request, .hdr.flags = VHOST_USER_VERSION, .payload.u64 = file->index & VHOST_USER_VRING_IDX_MASK, .hdr.size = sizeof(msg.payload.u64), }; if (ioeventfd_enabled() && file->fd > 0) { fds[fd_num++] = file->fd; } else { msg.payload.u64 |= VHOST_USER_VRING_NOFD_MASK; } return vhost_user_write(dev, &msg, fds, fd_num); } static int vhost_user_set_vring_kick(struct vhost_dev *dev, struct vhost_vring_file *file) { return vhost_set_vring_file(dev, VHOST_USER_SET_VRING_KICK, file); } static int vhost_user_set_vring_call(struct vhost_dev *dev, struct vhost_vring_file *file) { return vhost_set_vring_file(dev, VHOST_USER_SET_VRING_CALL, file); } static int vhost_user_set_vring_err(struct vhost_dev *dev, struct vhost_vring_file *file) { return vhost_set_vring_file(dev, VHOST_USER_SET_VRING_ERR, file); } static int vhost_user_get_u64(struct vhost_dev *dev, int request, uint64_t *u64) { int ret; VhostUserMsg msg = { .hdr.request = request, .hdr.flags = VHOST_USER_VERSION, }; if (vhost_user_one_time_request(request) && dev->vq_index != 0) { return 0; } ret = vhost_user_write(dev, &msg, NULL, 0); if (ret < 0) { return ret; } ret = vhost_user_read(dev, &msg); if (ret < 0) { return ret; } if (msg.hdr.request != request) { error_report("Received unexpected msg type. Expected %d received %d", request, msg.hdr.request); return -EPROTO; } if (msg.hdr.size != sizeof(msg.payload.u64)) { error_report("Received bad msg size."); return -EPROTO; } *u64 = msg.payload.u64; return 0; } static int vhost_user_get_features(struct vhost_dev *dev, uint64_t *features) { if (vhost_user_get_u64(dev, VHOST_USER_GET_FEATURES, features) < 0) { return -EPROTO; } return 0; } static int enforce_reply(struct vhost_dev *dev, const VhostUserMsg *msg) { uint64_t dummy; if (msg->hdr.flags & VHOST_USER_NEED_REPLY_MASK) { return process_message_reply(dev, msg); } /* * We need to wait for a reply but the backend does not * support replies for the command we just sent. * Send VHOST_USER_GET_FEATURES which makes all backends * send a reply. */ return vhost_user_get_features(dev, &dummy); } static int vhost_user_set_vring_addr(struct vhost_dev *dev, struct vhost_vring_addr *addr) { int ret; VhostUserMsg msg = { .hdr.request = VHOST_USER_SET_VRING_ADDR, .hdr.flags = VHOST_USER_VERSION, .payload.addr = *addr, .hdr.size = sizeof(msg.payload.addr), }; bool reply_supported = virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_REPLY_ACK); /* * wait for a reply if logging is enabled to make sure * backend is actually logging changes */ bool wait_for_reply = addr->flags & (1 << VHOST_VRING_F_LOG); if (reply_supported && wait_for_reply) { msg.hdr.flags |= VHOST_USER_NEED_REPLY_MASK; } ret = vhost_user_write(dev, &msg, NULL, 0); if (ret < 0) { return ret; } if (wait_for_reply) { return enforce_reply(dev, &msg); } return 0; } static int vhost_user_set_u64(struct vhost_dev *dev, int request, uint64_t u64, bool wait_for_reply) { VhostUserMsg msg = { .hdr.request = request, .hdr.flags = VHOST_USER_VERSION, .payload.u64 = u64, .hdr.size = sizeof(msg.payload.u64), }; int ret; if (wait_for_reply) { bool reply_supported = virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_REPLY_ACK); if (reply_supported) { msg.hdr.flags |= VHOST_USER_NEED_REPLY_MASK; } } ret = vhost_user_write(dev, &msg, NULL, 0); if (ret < 0) { return ret; } if (wait_for_reply) { return enforce_reply(dev, &msg); } return 0; } static int vhost_user_set_status(struct vhost_dev *dev, uint8_t status) { return vhost_user_set_u64(dev, VHOST_USER_SET_STATUS, status, false); } static int vhost_user_get_status(struct vhost_dev *dev, uint8_t *status) { uint64_t value; int ret; ret = vhost_user_get_u64(dev, VHOST_USER_GET_STATUS, &value); if (ret < 0) { return ret; } *status = value; return 0; } static int vhost_user_add_status(struct vhost_dev *dev, uint8_t status) { uint8_t s; int ret; ret = vhost_user_get_status(dev, &s); if (ret < 0) { return ret; } if ((s & status) == status) { return 0; } s |= status; return vhost_user_set_status(dev, s); } static int vhost_user_set_features(struct vhost_dev *dev, uint64_t features) { /* * wait for a reply if logging is enabled to make sure * backend is actually logging changes */ bool log_enabled = features & (0x1ULL << VHOST_F_LOG_ALL); int ret; /* * We need to include any extra backend only feature bits that * might be needed by our device. Currently this includes the * VHOST_USER_F_PROTOCOL_FEATURES bit for enabling protocol * features. */ ret = vhost_user_set_u64(dev, VHOST_USER_SET_FEATURES, features | dev->backend_features, log_enabled); if (virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_STATUS)) { if (!ret) { return vhost_user_add_status(dev, VIRTIO_CONFIG_S_FEATURES_OK); } } return ret; } static int vhost_user_set_protocol_features(struct vhost_dev *dev, uint64_t features) { return vhost_user_set_u64(dev, VHOST_USER_SET_PROTOCOL_FEATURES, features, false); } static int vhost_user_set_owner(struct vhost_dev *dev) { VhostUserMsg msg = { .hdr.request = VHOST_USER_SET_OWNER, .hdr.flags = VHOST_USER_VERSION, }; return vhost_user_write(dev, &msg, NULL, 0); } static int vhost_user_get_max_memslots(struct vhost_dev *dev, uint64_t *max_memslots) { uint64_t backend_max_memslots; int err; err = vhost_user_get_u64(dev, VHOST_USER_GET_MAX_MEM_SLOTS, &backend_max_memslots); if (err < 0) { return err; } *max_memslots = backend_max_memslots; return 0; } static int vhost_user_reset_device(struct vhost_dev *dev) { VhostUserMsg msg = { .hdr.flags = VHOST_USER_VERSION, }; msg.hdr.request = virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_RESET_DEVICE) ? VHOST_USER_RESET_DEVICE : VHOST_USER_RESET_OWNER; return vhost_user_write(dev, &msg, NULL, 0); } static int vhost_user_slave_handle_config_change(struct vhost_dev *dev) { if (!dev->config_ops || !dev->config_ops->vhost_dev_config_notifier) { return -ENOSYS; } return dev->config_ops->vhost_dev_config_notifier(dev); } /* * Fetch or create the notifier for a given idx. Newly created * notifiers are added to the pointer array that tracks them. */ static VhostUserHostNotifier *fetch_or_create_notifier(VhostUserState *u, int idx) { VhostUserHostNotifier *n = NULL; if (idx >= u->notifiers->len) { g_ptr_array_set_size(u->notifiers, idx + 1); } n = g_ptr_array_index(u->notifiers, idx); if (!n) { /* * In case notification arrive out-of-order, * make room for current index. */ g_ptr_array_remove_index(u->notifiers, idx); n = g_new0(VhostUserHostNotifier, 1); n->idx = idx; g_ptr_array_insert(u->notifiers, idx, n); trace_vhost_user_create_notifier(idx, n); } return n; } static int vhost_user_slave_handle_vring_host_notifier(struct vhost_dev *dev, VhostUserVringArea *area, int fd) { int queue_idx = area->u64 & VHOST_USER_VRING_IDX_MASK; size_t page_size = qemu_real_host_page_size(); struct vhost_user *u = dev->opaque; VhostUserState *user = u->user; VirtIODevice *vdev = dev->vdev; VhostUserHostNotifier *n; void *addr; char *name; if (!virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_HOST_NOTIFIER) || vdev == NULL || queue_idx >= virtio_get_num_queues(vdev)) { return -EINVAL; } /* * Fetch notifier and invalidate any old data before setting up * new mapped address. */ n = fetch_or_create_notifier(user, queue_idx); vhost_user_host_notifier_remove(n, vdev); if (area->u64 & VHOST_USER_VRING_NOFD_MASK) { return 0; } /* Sanity check. */ if (area->size != page_size) { return -EINVAL; } addr = mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, area->offset); if (addr == MAP_FAILED) { return -EFAULT; } name = g_strdup_printf("vhost-user/host-notifier@%p mmaps[%d]", user, queue_idx); if (!n->mr.ram) { /* Don't init again after suspend. */ memory_region_init_ram_device_ptr(&n->mr, OBJECT(vdev), name, page_size, addr); } else { n->mr.ram_block->host = addr; } g_free(name); if (virtio_queue_set_host_notifier_mr(vdev, queue_idx, &n->mr, true)) { object_unparent(OBJECT(&n->mr)); munmap(addr, page_size); return -ENXIO; } n->addr = addr; return 0; } static void close_slave_channel(struct vhost_user *u) { g_source_destroy(u->slave_src); g_source_unref(u->slave_src); u->slave_src = NULL; object_unref(OBJECT(u->slave_ioc)); u->slave_ioc = NULL; } static gboolean slave_read(QIOChannel *ioc, GIOCondition condition, gpointer opaque) { struct vhost_dev *dev = opaque; struct vhost_user *u = dev->opaque; VhostUserHeader hdr = { 0, }; VhostUserPayload payload = { 0, }; Error *local_err = NULL; gboolean rc = G_SOURCE_CONTINUE; int ret = 0; struct iovec iov; g_autofree int *fd = NULL; size_t fdsize = 0; int i; /* Read header */ iov.iov_base = &hdr; iov.iov_len = VHOST_USER_HDR_SIZE; if (qio_channel_readv_full_all(ioc, &iov, 1, &fd, &fdsize, &local_err)) { error_report_err(local_err); goto err; } if (hdr.size > VHOST_USER_PAYLOAD_SIZE) { error_report("Failed to read msg header." " Size %d exceeds the maximum %zu.", hdr.size, VHOST_USER_PAYLOAD_SIZE); goto err; } /* Read payload */ if (qio_channel_read_all(ioc, (char *) &payload, hdr.size, &local_err)) { error_report_err(local_err); goto err; } switch (hdr.request) { case VHOST_USER_SLAVE_IOTLB_MSG: ret = vhost_backend_handle_iotlb_msg(dev, &payload.iotlb); break; case VHOST_USER_SLAVE_CONFIG_CHANGE_MSG : ret = vhost_user_slave_handle_config_change(dev); break; case VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG: ret = vhost_user_slave_handle_vring_host_notifier(dev, &payload.area, fd ? fd[0] : -1); break; default: error_report("Received unexpected msg type: %d.", hdr.request); ret = -EINVAL; } /* * REPLY_ACK feature handling. Other reply types has to be managed * directly in their request handlers. */ if (hdr.flags & VHOST_USER_NEED_REPLY_MASK) { struct iovec iovec[2]; hdr.flags &= ~VHOST_USER_NEED_REPLY_MASK; hdr.flags |= VHOST_USER_REPLY_MASK; payload.u64 = !!ret; hdr.size = sizeof(payload.u64); iovec[0].iov_base = &hdr; iovec[0].iov_len = VHOST_USER_HDR_SIZE; iovec[1].iov_base = &payload; iovec[1].iov_len = hdr.size; if (qio_channel_writev_all(ioc, iovec, ARRAY_SIZE(iovec), &local_err)) { error_report_err(local_err); goto err; } } goto fdcleanup; err: close_slave_channel(u); rc = G_SOURCE_REMOVE; fdcleanup: if (fd) { for (i = 0; i < fdsize; i++) { close(fd[i]); } } return rc; } static int vhost_setup_slave_channel(struct vhost_dev *dev) { VhostUserMsg msg = { .hdr.request = VHOST_USER_SET_SLAVE_REQ_FD, .hdr.flags = VHOST_USER_VERSION, }; struct vhost_user *u = dev->opaque; int sv[2], ret = 0; bool reply_supported = virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_REPLY_ACK); Error *local_err = NULL; QIOChannel *ioc; if (!virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_SLAVE_REQ)) { return 0; } if (qemu_socketpair(PF_UNIX, SOCK_STREAM, 0, sv) == -1) { int saved_errno = errno; error_report("socketpair() failed"); return -saved_errno; } ioc = QIO_CHANNEL(qio_channel_socket_new_fd(sv[0], &local_err)); if (!ioc) { error_report_err(local_err); return -ECONNREFUSED; } u->slave_ioc = ioc; slave_update_read_handler(dev, NULL); if (reply_supported) { msg.hdr.flags |= VHOST_USER_NEED_REPLY_MASK; } ret = vhost_user_write(dev, &msg, &sv[1], 1); if (ret) { goto out; } if (reply_supported) { ret = process_message_reply(dev, &msg); } out: close(sv[1]); if (ret) { close_slave_channel(u); } return ret; } #ifdef CONFIG_LINUX /* * Called back from the postcopy fault thread when a fault is received on our * ufd. * TODO: This is Linux specific */ static int vhost_user_postcopy_fault_handler(struct PostCopyFD *pcfd, void *ufd) { struct vhost_dev *dev = pcfd->data; struct vhost_user *u = dev->opaque; struct uffd_msg *msg = ufd; uint64_t faultaddr = msg->arg.pagefault.address; RAMBlock *rb = NULL; uint64_t rb_offset; int i; trace_vhost_user_postcopy_fault_handler(pcfd->idstr, faultaddr, dev->mem->nregions); for (i = 0; i < MIN(dev->mem->nregions, u->region_rb_len); i++) { trace_vhost_user_postcopy_fault_handler_loop(i, u->postcopy_client_bases[i], dev->mem->regions[i].memory_size); if (faultaddr >= u->postcopy_client_bases[i]) { /* Ofset of the fault address in the vhost region */ uint64_t region_offset = faultaddr - u->postcopy_client_bases[i]; if (region_offset < dev->mem->regions[i].memory_size) { rb_offset = region_offset + u->region_rb_offset[i]; trace_vhost_user_postcopy_fault_handler_found(i, region_offset, rb_offset); rb = u->region_rb[i]; return postcopy_request_shared_page(pcfd, rb, faultaddr, rb_offset); } } } error_report("%s: Failed to find region for fault %" PRIx64, __func__, faultaddr); return -1; } static int vhost_user_postcopy_waker(struct PostCopyFD *pcfd, RAMBlock *rb, uint64_t offset) { struct vhost_dev *dev = pcfd->data; struct vhost_user *u = dev->opaque; int i; trace_vhost_user_postcopy_waker(qemu_ram_get_idstr(rb), offset); if (!u) { return 0; } /* Translate the offset into an address in the clients address space */ for (i = 0; i < MIN(dev->mem->nregions, u->region_rb_len); i++) { if (u->region_rb[i] == rb && offset >= u->region_rb_offset[i] && offset < (u->region_rb_offset[i] + dev->mem->regions[i].memory_size)) { uint64_t client_addr = (offset - u->region_rb_offset[i]) + u->postcopy_client_bases[i]; trace_vhost_user_postcopy_waker_found(client_addr); return postcopy_wake_shared(pcfd, client_addr, rb); } } trace_vhost_user_postcopy_waker_nomatch(qemu_ram_get_idstr(rb), offset); return 0; } #endif /* * Called at the start of an inbound postcopy on reception of the * 'advise' command. */ static int vhost_user_postcopy_advise(struct vhost_dev *dev, Error **errp) { #ifdef CONFIG_LINUX struct vhost_user *u = dev->opaque; CharBackend *chr = u->user->chr; int ufd; int ret; VhostUserMsg msg = { .hdr.request = VHOST_USER_POSTCOPY_ADVISE, .hdr.flags = VHOST_USER_VERSION, }; ret = vhost_user_write(dev, &msg, NULL, 0); if (ret < 0) { error_setg(errp, "Failed to send postcopy_advise to vhost"); return ret; } ret = vhost_user_read(dev, &msg); if (ret < 0) { error_setg(errp, "Failed to get postcopy_advise reply from vhost"); return ret; } if (msg.hdr.request != VHOST_USER_POSTCOPY_ADVISE) { error_setg(errp, "Unexpected msg type. Expected %d received %d", VHOST_USER_POSTCOPY_ADVISE, msg.hdr.request); return -EPROTO; } if (msg.hdr.size) { error_setg(errp, "Received bad msg size."); return -EPROTO; } ufd = qemu_chr_fe_get_msgfd(chr); if (ufd < 0) { error_setg(errp, "%s: Failed to get ufd", __func__); return -EIO; } qemu_socket_set_nonblock(ufd); /* register ufd with userfault thread */ u->postcopy_fd.fd = ufd; u->postcopy_fd.data = dev; u->postcopy_fd.handler = vhost_user_postcopy_fault_handler; u->postcopy_fd.waker = vhost_user_postcopy_waker; u->postcopy_fd.idstr = "vhost-user"; /* Need to find unique name */ postcopy_register_shared_ufd(&u->postcopy_fd); return 0; #else error_setg(errp, "Postcopy not supported on non-Linux systems"); return -ENOSYS; #endif } /* * Called at the switch to postcopy on reception of the 'listen' command. */ static int vhost_user_postcopy_listen(struct vhost_dev *dev, Error **errp) { struct vhost_user *u = dev->opaque; int ret; VhostUserMsg msg = { .hdr.request = VHOST_USER_POSTCOPY_LISTEN, .hdr.flags = VHOST_USER_VERSION | VHOST_USER_NEED_REPLY_MASK, }; u->postcopy_listen = true; trace_vhost_user_postcopy_listen(); ret = vhost_user_write(dev, &msg, NULL, 0); if (ret < 0) { error_setg(errp, "Failed to send postcopy_listen to vhost"); return ret; } ret = process_message_reply(dev, &msg); if (ret) { error_setg(errp, "Failed to receive reply to postcopy_listen"); return ret; } return 0; } /* * Called at the end of postcopy */ static int vhost_user_postcopy_end(struct vhost_dev *dev, Error **errp) { VhostUserMsg msg = { .hdr.request = VHOST_USER_POSTCOPY_END, .hdr.flags = VHOST_USER_VERSION | VHOST_USER_NEED_REPLY_MASK, }; int ret; struct vhost_user *u = dev->opaque; trace_vhost_user_postcopy_end_entry(); ret = vhost_user_write(dev, &msg, NULL, 0); if (ret < 0) { error_setg(errp, "Failed to send postcopy_end to vhost"); return ret; } ret = process_message_reply(dev, &msg); if (ret) { error_setg(errp, "Failed to receive reply to postcopy_end"); return ret; } postcopy_unregister_shared_ufd(&u->postcopy_fd); close(u->postcopy_fd.fd); u->postcopy_fd.handler = NULL; trace_vhost_user_postcopy_end_exit(); return 0; } static int vhost_user_postcopy_notifier(NotifierWithReturn *notifier, void *opaque) { struct PostcopyNotifyData *pnd = opaque; struct vhost_user *u = container_of(notifier, struct vhost_user, postcopy_notifier); struct vhost_dev *dev = u->dev; switch (pnd->reason) { case POSTCOPY_NOTIFY_PROBE: if (!virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_PAGEFAULT)) { /* TODO: Get the device name into this error somehow */ error_setg(pnd->errp, "vhost-user backend not capable of postcopy"); return -ENOENT; } break; case POSTCOPY_NOTIFY_INBOUND_ADVISE: return vhost_user_postcopy_advise(dev, pnd->errp); case POSTCOPY_NOTIFY_INBOUND_LISTEN: return vhost_user_postcopy_listen(dev, pnd->errp); case POSTCOPY_NOTIFY_INBOUND_END: return vhost_user_postcopy_end(dev, pnd->errp); default: /* We ignore notifications we don't know */ break; } return 0; } static int vhost_user_backend_init(struct vhost_dev *dev, void *opaque, Error **errp) { uint64_t features, ram_slots; struct vhost_user *u; VhostUserState *vus = (VhostUserState *) opaque; int err; assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER); u = g_new0(struct vhost_user, 1); u->user = vus; u->dev = dev; dev->opaque = u; err = vhost_user_get_features(dev, &features); if (err < 0) { error_setg_errno(errp, -err, "vhost_backend_init failed"); return err; } if (virtio_has_feature(features, VHOST_USER_F_PROTOCOL_FEATURES)) { bool supports_f_config = vus->supports_config || (dev->config_ops && dev->config_ops->vhost_dev_config_notifier); uint64_t protocol_features; dev->backend_features |= 1ULL << VHOST_USER_F_PROTOCOL_FEATURES; err = vhost_user_get_u64(dev, VHOST_USER_GET_PROTOCOL_FEATURES, &protocol_features); if (err < 0) { error_setg_errno(errp, EPROTO, "vhost_backend_init failed"); return -EPROTO; } /* * We will use all the protocol features we support - although * we suppress F_CONFIG if we know QEMUs internal code can not support * it. */ protocol_features &= VHOST_USER_PROTOCOL_FEATURE_MASK; if (supports_f_config) { if (!virtio_has_feature(protocol_features, VHOST_USER_PROTOCOL_F_CONFIG)) { error_setg(errp, "vhost-user device expecting " "VHOST_USER_PROTOCOL_F_CONFIG but the vhost-user backend does " "not support it."); return -EPROTO; } } else { if (virtio_has_feature(protocol_features, VHOST_USER_PROTOCOL_F_CONFIG)) { warn_report("vhost-user backend supports " "VHOST_USER_PROTOCOL_F_CONFIG but QEMU does not."); protocol_features &= ~(1ULL << VHOST_USER_PROTOCOL_F_CONFIG); } } /* final set of protocol features */ dev->protocol_features = protocol_features; err = vhost_user_set_protocol_features(dev, dev->protocol_features); if (err < 0) { error_setg_errno(errp, EPROTO, "vhost_backend_init failed"); return -EPROTO; } /* query the max queues we support if backend supports Multiple Queue */ if (dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_MQ)) { err = vhost_user_get_u64(dev, VHOST_USER_GET_QUEUE_NUM, &dev->max_queues); if (err < 0) { error_setg_errno(errp, EPROTO, "vhost_backend_init failed"); return -EPROTO; } } else { dev->max_queues = 1; } if (dev->num_queues && dev->max_queues < dev->num_queues) { error_setg(errp, "The maximum number of queues supported by the " "backend is %" PRIu64, dev->max_queues); return -EINVAL; } if (virtio_has_feature(features, VIRTIO_F_IOMMU_PLATFORM) && !(virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_SLAVE_REQ) && virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_REPLY_ACK))) { error_setg(errp, "IOMMU support requires reply-ack and " "slave-req protocol features."); return -EINVAL; } /* get max memory regions if backend supports configurable RAM slots */ if (!virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_CONFIGURE_MEM_SLOTS)) { u->user->memory_slots = VHOST_MEMORY_BASELINE_NREGIONS; } else { err = vhost_user_get_max_memslots(dev, &ram_slots); if (err < 0) { error_setg_errno(errp, EPROTO, "vhost_backend_init failed"); return -EPROTO; } if (ram_slots < u->user->memory_slots) { error_setg(errp, "The backend specified a max ram slots limit " "of %" PRIu64", when the prior validated limit was " "%d. This limit should never decrease.", ram_slots, u->user->memory_slots); return -EINVAL; } u->user->memory_slots = MIN(ram_slots, VHOST_USER_MAX_RAM_SLOTS); } } if (dev->migration_blocker == NULL && !virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_LOG_SHMFD)) { error_setg(&dev->migration_blocker, "Migration disabled: vhost-user backend lacks " "VHOST_USER_PROTOCOL_F_LOG_SHMFD feature."); } if (dev->vq_index == 0) { err = vhost_setup_slave_channel(dev); if (err < 0) { error_setg_errno(errp, EPROTO, "vhost_backend_init failed"); return -EPROTO; } } u->postcopy_notifier.notify = vhost_user_postcopy_notifier; postcopy_add_notifier(&u->postcopy_notifier); return 0; } static int vhost_user_backend_cleanup(struct vhost_dev *dev) { struct vhost_user *u; assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER); u = dev->opaque; if (u->postcopy_notifier.notify) { postcopy_remove_notifier(&u->postcopy_notifier); u->postcopy_notifier.notify = NULL; } u->postcopy_listen = false; if (u->postcopy_fd.handler) { postcopy_unregister_shared_ufd(&u->postcopy_fd); close(u->postcopy_fd.fd); u->postcopy_fd.handler = NULL; } if (u->slave_ioc) { close_slave_channel(u); } g_free(u->region_rb); u->region_rb = NULL; g_free(u->region_rb_offset); u->region_rb_offset = NULL; u->region_rb_len = 0; g_free(u); dev->opaque = 0; return 0; } static int vhost_user_get_vq_index(struct vhost_dev *dev, int idx) { assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs); return idx; } static int vhost_user_memslots_limit(struct vhost_dev *dev) { struct vhost_user *u = dev->opaque; return u->user->memory_slots; } static bool vhost_user_requires_shm_log(struct vhost_dev *dev) { assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER); return virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_LOG_SHMFD); } static int vhost_user_migration_done(struct vhost_dev *dev, char* mac_addr) { VhostUserMsg msg = { }; assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER); /* If guest supports GUEST_ANNOUNCE do nothing */ if (virtio_has_feature(dev->acked_features, VIRTIO_NET_F_GUEST_ANNOUNCE)) { return 0; } /* if backend supports VHOST_USER_PROTOCOL_F_RARP ask it to send the RARP */ if (virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_RARP)) { msg.hdr.request = VHOST_USER_SEND_RARP; msg.hdr.flags = VHOST_USER_VERSION; memcpy((char *)&msg.payload.u64, mac_addr, 6); msg.hdr.size = sizeof(msg.payload.u64); return vhost_user_write(dev, &msg, NULL, 0); } return -ENOTSUP; } static bool vhost_user_can_merge(struct vhost_dev *dev, uint64_t start1, uint64_t size1, uint64_t start2, uint64_t size2) { ram_addr_t offset; int mfd, rfd; (void)vhost_user_get_mr_data(start1, &offset, &mfd); (void)vhost_user_get_mr_data(start2, &offset, &rfd); return mfd == rfd; } static int vhost_user_net_set_mtu(struct vhost_dev *dev, uint16_t mtu) { VhostUserMsg msg; bool reply_supported = virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_REPLY_ACK); int ret; if (!(dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_NET_MTU))) { return 0; } msg.hdr.request = VHOST_USER_NET_SET_MTU; msg.payload.u64 = mtu; msg.hdr.size = sizeof(msg.payload.u64); msg.hdr.flags = VHOST_USER_VERSION; if (reply_supported) { msg.hdr.flags |= VHOST_USER_NEED_REPLY_MASK; } ret = vhost_user_write(dev, &msg, NULL, 0); if (ret < 0) { return ret; } /* If reply_ack supported, slave has to ack specified MTU is valid */ if (reply_supported) { return process_message_reply(dev, &msg); } return 0; } static int vhost_user_send_device_iotlb_msg(struct vhost_dev *dev, struct vhost_iotlb_msg *imsg) { int ret; VhostUserMsg msg = { .hdr.request = VHOST_USER_IOTLB_MSG, .hdr.size = sizeof(msg.payload.iotlb), .hdr.flags = VHOST_USER_VERSION | VHOST_USER_NEED_REPLY_MASK, .payload.iotlb = *imsg, }; ret = vhost_user_write(dev, &msg, NULL, 0); if (ret < 0) { return ret; } return process_message_reply(dev, &msg); } static void vhost_user_set_iotlb_callback(struct vhost_dev *dev, int enabled) { /* No-op as the receive channel is not dedicated to IOTLB messages. */ } static int vhost_user_get_config(struct vhost_dev *dev, uint8_t *config, uint32_t config_len, Error **errp) { int ret; VhostUserMsg msg = { .hdr.request = VHOST_USER_GET_CONFIG, .hdr.flags = VHOST_USER_VERSION, .hdr.size = VHOST_USER_CONFIG_HDR_SIZE + config_len, }; if (!virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_CONFIG)) { error_setg(errp, "VHOST_USER_PROTOCOL_F_CONFIG not supported"); return -EINVAL; } assert(config_len <= VHOST_USER_MAX_CONFIG_SIZE); msg.payload.config.offset = 0; msg.payload.config.size = config_len; ret = vhost_user_write(dev, &msg, NULL, 0); if (ret < 0) { error_setg_errno(errp, -ret, "vhost_get_config failed"); return ret; } ret = vhost_user_read(dev, &msg); if (ret < 0) { error_setg_errno(errp, -ret, "vhost_get_config failed"); return ret; } if (msg.hdr.request != VHOST_USER_GET_CONFIG) { error_setg(errp, "Received unexpected msg type. Expected %d received %d", VHOST_USER_GET_CONFIG, msg.hdr.request); return -EPROTO; } if (msg.hdr.size != VHOST_USER_CONFIG_HDR_SIZE + config_len) { error_setg(errp, "Received bad msg size."); return -EPROTO; } memcpy(config, msg.payload.config.region, config_len); return 0; } static int vhost_user_set_config(struct vhost_dev *dev, const uint8_t *data, uint32_t offset, uint32_t size, uint32_t flags) { int ret; uint8_t *p; bool reply_supported = virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_REPLY_ACK); VhostUserMsg msg = { .hdr.request = VHOST_USER_SET_CONFIG, .hdr.flags = VHOST_USER_VERSION, .hdr.size = VHOST_USER_CONFIG_HDR_SIZE + size, }; if (!virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_CONFIG)) { return -ENOTSUP; } if (reply_supported) { msg.hdr.flags |= VHOST_USER_NEED_REPLY_MASK; } if (size > VHOST_USER_MAX_CONFIG_SIZE) { return -EINVAL; } msg.payload.config.offset = offset, msg.payload.config.size = size, msg.payload.config.flags = flags, p = msg.payload.config.region; memcpy(p, data, size); ret = vhost_user_write(dev, &msg, NULL, 0); if (ret < 0) { return ret; } if (reply_supported) { return process_message_reply(dev, &msg); } return 0; } static int vhost_user_crypto_create_session(struct vhost_dev *dev, void *session_info, uint64_t *session_id) { int ret; bool crypto_session = virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_CRYPTO_SESSION); CryptoDevBackendSymSessionInfo *sess_info = session_info; VhostUserMsg msg = { .hdr.request = VHOST_USER_CREATE_CRYPTO_SESSION, .hdr.flags = VHOST_USER_VERSION, .hdr.size = sizeof(msg.payload.session), }; assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER); if (!crypto_session) { error_report("vhost-user trying to send unhandled ioctl"); return -ENOTSUP; } memcpy(&msg.payload.session.session_setup_data, sess_info, sizeof(CryptoDevBackendSymSessionInfo)); if (sess_info->key_len) { memcpy(&msg.payload.session.key, sess_info->cipher_key, sess_info->key_len); } if (sess_info->auth_key_len > 0) { memcpy(&msg.payload.session.auth_key, sess_info->auth_key, sess_info->auth_key_len); } ret = vhost_user_write(dev, &msg, NULL, 0); if (ret < 0) { error_report("vhost_user_write() return %d, create session failed", ret); return ret; } ret = vhost_user_read(dev, &msg); if (ret < 0) { error_report("vhost_user_read() return %d, create session failed", ret); return ret; } if (msg.hdr.request != VHOST_USER_CREATE_CRYPTO_SESSION) { error_report("Received unexpected msg type. Expected %d received %d", VHOST_USER_CREATE_CRYPTO_SESSION, msg.hdr.request); return -EPROTO; } if (msg.hdr.size != sizeof(msg.payload.session)) { error_report("Received bad msg size."); return -EPROTO; } if (msg.payload.session.session_id < 0) { error_report("Bad session id: %" PRId64 "", msg.payload.session.session_id); return -EINVAL; } *session_id = msg.payload.session.session_id; return 0; } static int vhost_user_crypto_close_session(struct vhost_dev *dev, uint64_t session_id) { int ret; bool crypto_session = virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_CRYPTO_SESSION); VhostUserMsg msg = { .hdr.request = VHOST_USER_CLOSE_CRYPTO_SESSION, .hdr.flags = VHOST_USER_VERSION, .hdr.size = sizeof(msg.payload.u64), }; msg.payload.u64 = session_id; if (!crypto_session) { error_report("vhost-user trying to send unhandled ioctl"); return -ENOTSUP; } ret = vhost_user_write(dev, &msg, NULL, 0); if (ret < 0) { error_report("vhost_user_write() return %d, close session failed", ret); return ret; } return 0; } static bool vhost_user_mem_section_filter(struct vhost_dev *dev, MemoryRegionSection *section) { bool result; result = memory_region_get_fd(section->mr) >= 0; return result; } static int vhost_user_get_inflight_fd(struct vhost_dev *dev, uint16_t queue_size, struct vhost_inflight *inflight) { void *addr; int fd; int ret; struct vhost_user *u = dev->opaque; CharBackend *chr = u->user->chr; VhostUserMsg msg = { .hdr.request = VHOST_USER_GET_INFLIGHT_FD, .hdr.flags = VHOST_USER_VERSION, .payload.inflight.num_queues = dev->nvqs, .payload.inflight.queue_size = queue_size, .hdr.size = sizeof(msg.payload.inflight), }; if (!virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)) { return 0; } ret = vhost_user_write(dev, &msg, NULL, 0); if (ret < 0) { return ret; } ret = vhost_user_read(dev, &msg); if (ret < 0) { return ret; } if (msg.hdr.request != VHOST_USER_GET_INFLIGHT_FD) { error_report("Received unexpected msg type. " "Expected %d received %d", VHOST_USER_GET_INFLIGHT_FD, msg.hdr.request); return -EPROTO; } if (msg.hdr.size != sizeof(msg.payload.inflight)) { error_report("Received bad msg size."); return -EPROTO; } if (!msg.payload.inflight.mmap_size) { return 0; } fd = qemu_chr_fe_get_msgfd(chr); if (fd < 0) { error_report("Failed to get mem fd"); return -EIO; } addr = mmap(0, msg.payload.inflight.mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, msg.payload.inflight.mmap_offset); if (addr == MAP_FAILED) { error_report("Failed to mmap mem fd"); close(fd); return -EFAULT; } inflight->addr = addr; inflight->fd = fd; inflight->size = msg.payload.inflight.mmap_size; inflight->offset = msg.payload.inflight.mmap_offset; inflight->queue_size = queue_size; return 0; } static int vhost_user_set_inflight_fd(struct vhost_dev *dev, struct vhost_inflight *inflight) { VhostUserMsg msg = { .hdr.request = VHOST_USER_SET_INFLIGHT_FD, .hdr.flags = VHOST_USER_VERSION, .payload.inflight.mmap_size = inflight->size, .payload.inflight.mmap_offset = inflight->offset, .payload.inflight.num_queues = dev->nvqs, .payload.inflight.queue_size = inflight->queue_size, .hdr.size = sizeof(msg.payload.inflight), }; if (!virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)) { return 0; } return vhost_user_write(dev, &msg, &inflight->fd, 1); } static void vhost_user_state_destroy(gpointer data) { VhostUserHostNotifier *n = (VhostUserHostNotifier *) data; if (n) { vhost_user_host_notifier_remove(n, NULL); object_unparent(OBJECT(&n->mr)); /* * We can't free until vhost_user_host_notifier_remove has * done it's thing so schedule the free with RCU. */ g_free_rcu(n, rcu); } } bool vhost_user_init(VhostUserState *user, CharBackend *chr, Error **errp) { if (user->chr) { error_setg(errp, "Cannot initialize vhost-user state"); return false; } user->chr = chr; user->memory_slots = 0; user->notifiers = g_ptr_array_new_full(VIRTIO_QUEUE_MAX / 4, &vhost_user_state_destroy); return true; } void vhost_user_cleanup(VhostUserState *user) { if (!user->chr) { return; } memory_region_transaction_begin(); user->notifiers = (GPtrArray *) g_ptr_array_free(user->notifiers, true); memory_region_transaction_commit(); user->chr = NULL; } typedef struct { vu_async_close_fn cb; DeviceState *dev; CharBackend *cd; struct vhost_dev *vhost; } VhostAsyncCallback; static void vhost_user_async_close_bh(void *opaque) { VhostAsyncCallback *data = opaque; struct vhost_dev *vhost = data->vhost; /* * If the vhost_dev has been cleared in the meantime there is * nothing left to do as some other path has completed the * cleanup. */ if (vhost->vdev) { data->cb(data->dev); } g_free(data); } /* * We only schedule the work if the machine is running. If suspended * we want to keep all the in-flight data as is for migration * purposes. */ void vhost_user_async_close(DeviceState *d, CharBackend *chardev, struct vhost_dev *vhost, vu_async_close_fn cb) { if (!runstate_check(RUN_STATE_SHUTDOWN)) { /* * A close event may happen during a read/write, but vhost * code assumes the vhost_dev remains setup, so delay the * stop & clear. */ AioContext *ctx = qemu_get_current_aio_context(); VhostAsyncCallback *data = g_new0(VhostAsyncCallback, 1); /* Save data for the callback */ data->cb = cb; data->dev = d; data->cd = chardev; data->vhost = vhost; /* Disable any further notifications on the chardev */ qemu_chr_fe_set_handlers(chardev, NULL, NULL, NULL, NULL, NULL, NULL, false); aio_bh_schedule_oneshot(ctx, vhost_user_async_close_bh, data); /* * Move vhost device to the stopped state. The vhost-user device * will be clean up and disconnected in BH. This can be useful in * the vhost migration code. If disconnect was caught there is an * option for the general vhost code to get the dev state without * knowing its type (in this case vhost-user). * * Note if the vhost device is fully cleared by the time we * execute the bottom half we won't continue with the cleanup. */ vhost->started = false; } } static int vhost_user_dev_start(struct vhost_dev *dev, bool started) { if (!virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_STATUS)) { return 0; } /* Set device status only for last queue pair */ if (dev->vq_index + dev->nvqs != dev->vq_index_end) { return 0; } if (started) { return vhost_user_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE | VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_DRIVER_OK); } else { return vhost_user_set_status(dev, 0); } } const VhostOps user_ops = { .backend_type = VHOST_BACKEND_TYPE_USER, .vhost_backend_init = vhost_user_backend_init, .vhost_backend_cleanup = vhost_user_backend_cleanup, .vhost_backend_memslots_limit = vhost_user_memslots_limit, .vhost_set_log_base = vhost_user_set_log_base, .vhost_set_mem_table = vhost_user_set_mem_table, .vhost_set_vring_addr = vhost_user_set_vring_addr, .vhost_set_vring_endian = vhost_user_set_vring_endian, .vhost_set_vring_num = vhost_user_set_vring_num, .vhost_set_vring_base = vhost_user_set_vring_base, .vhost_get_vring_base = vhost_user_get_vring_base, .vhost_set_vring_kick = vhost_user_set_vring_kick, .vhost_set_vring_call = vhost_user_set_vring_call, .vhost_set_vring_err = vhost_user_set_vring_err, .vhost_set_features = vhost_user_set_features, .vhost_get_features = vhost_user_get_features, .vhost_set_owner = vhost_user_set_owner, .vhost_reset_device = vhost_user_reset_device, .vhost_get_vq_index = vhost_user_get_vq_index, .vhost_set_vring_enable = vhost_user_set_vring_enable, .vhost_requires_shm_log = vhost_user_requires_shm_log, .vhost_migration_done = vhost_user_migration_done, .vhost_backend_can_merge = vhost_user_can_merge, .vhost_net_set_mtu = vhost_user_net_set_mtu, .vhost_set_iotlb_callback = vhost_user_set_iotlb_callback, .vhost_send_device_iotlb_msg = vhost_user_send_device_iotlb_msg, .vhost_get_config = vhost_user_get_config, .vhost_set_config = vhost_user_set_config, .vhost_crypto_create_session = vhost_user_crypto_create_session, .vhost_crypto_close_session = vhost_user_crypto_close_session, .vhost_backend_mem_section_filter = vhost_user_mem_section_filter, .vhost_get_inflight_fd = vhost_user_get_inflight_fd, .vhost_set_inflight_fd = vhost_user_set_inflight_fd, .vhost_dev_start = vhost_user_dev_start, };