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qemu/hw/virtio/vhost-user.c
Li Feng f02a4b8e64 vhost-user: fix lost reconnect 
When the vhost-user is reconnecting to the backend, and if the vhost-user fails
at the get_features in vhost_dev_init(), then the reconnect will fail
and it will not be retriggered forever.

The reason is:
When the vhost-user fails at get_features, the vhost_dev_cleanup will be called
immediately.

vhost_dev_cleanup calls 'memset(hdev, 0, sizeof(struct vhost_dev))'.

The reconnect path is:
vhost_user_blk_event
   vhost_user_async_close(.. vhost_user_blk_disconnect ..)
     qemu_chr_fe_set_handlers <----- clear the notifier callback
       schedule vhost_user_async_close_bh

The vhost->vdev is null, so the vhost_user_blk_disconnect will not be
called, then the event fd callback will not be reinstalled.

All vhost-user devices have this issue, including vhost-user-blk/scsi.

With this patch, if the vdev->vdev is null, the fd callback will still
be reinstalled.

Fixes: 71e076a07d ("hw/virtio: generalise CHR_EVENT_CLOSED handling")

Signed-off-by: Li Feng <fengli@smartx.com>
Reviewed-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
Message-Id: <20231009044735.941655-6-fengli@smartx.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2023-10-22 05:18:17 -04:00

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/*
* 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/virtio-dmabuf.h"
#include "hw/virtio/vhost.h"
#include "hw/virtio/virtio-crypto.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/uuid.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 <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include "standard-headers/linux/vhost_types.h"
#ifdef CONFIG_LINUX
#include <linux/userfaultfd.h>
#endif
#define VHOST_MEMORY_BASELINE_NREGIONS 8
#define VHOST_USER_F_PROTOCOL_FEATURES 30
#define VHOST_USER_BACKEND_MAX_FDS 8
#if 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
#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_BACKEND_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_GET_SHARED_OBJECT = 41,
VHOST_USER_MAX
} VhostUserRequest;
typedef enum VhostUserBackendRequest {
VHOST_USER_BACKEND_NONE = 0,
VHOST_USER_BACKEND_IOTLB_MSG = 1,
VHOST_USER_BACKEND_CONFIG_CHANGE_MSG = 2,
VHOST_USER_BACKEND_VRING_HOST_NOTIFIER_MSG = 3,
VHOST_USER_BACKEND_SHARED_OBJECT_ADD = 6,
VHOST_USER_BACKEND_SHARED_OBJECT_REMOVE = 7,
VHOST_USER_BACKEND_SHARED_OBJECT_LOOKUP = 8,
VHOST_USER_BACKEND_MAX
} VhostUserBackendRequest;
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
#define VHOST_CRYPTO_ASYM_MAX_KEY_LEN 1024
typedef struct VhostUserCryptoSession {
uint64_t op_code;
union {
struct {
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];
} sym;
struct {
CryptoDevBackendAsymSessionInfo session_setup_data;
uint8_t key[VHOST_CRYPTO_ASYM_MAX_KEY_LEN];
} asym;
} u;
/* session id for success, -1 on errors */
int64_t session_id;
} 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 VhostUserShared {
unsigned char uuid[16];
} VhostUserShared;
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;
VhostUserShared object;
} 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 *backend_ioc;
GSource *backend_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;
}
static int vhost_user_read(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;
r = vhost_user_read_header(dev, msg);
if (r < 0) {
return r;
}
/* 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);
return -EPROTO;
}
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);
return r < 0 ? -saved_errno : -EIO;
}
}
return 0;
}
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_per_device_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:
case VHOST_USER_RESET_DEVICE:
case VHOST_USER_ADD_MEM_REG:
case VHOST_USER_REM_MEM_REG:
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;
/*
* Some devices, like virtio-scsi, are implemented as a single vhost_dev,
* while others, like virtio-net, contain multiple vhost_devs. For
* operations such as configuring device memory mappings or issuing device
* resets, which affect the whole device instead of individual VQs,
* vhost-user messages should only be sent once.
*
* Devices with multiple vhost_devs are given an associated dev->vq_index
* so per_device requests are only sent if vq_index is 0.
*/
if (vhost_user_per_device_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),
};
/* Send only once with first queue pair */
if (dev->vq_index != 0) {
return 0;
}
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);
*offset += mr->ram_block->fd_offset;
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(&region_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(&region_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(&region_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_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_per_device_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;
}
/* Note: "msg->hdr.flags" may be modified. */
static int vhost_user_write_sync(struct vhost_dev *dev, VhostUserMsg *msg,
bool wait_for_reply)
{
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) {
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);
}
return 0;
}
static int vhost_set_vring(struct vhost_dev *dev,
unsigned long int request,
struct vhost_vring_state *ring,
bool wait_for_reply)
{
VhostUserMsg msg = {
.hdr.request = request,
.hdr.flags = VHOST_USER_VERSION,
.payload.state = *ring,
.hdr.size = sizeof(msg.payload.state),
};
return vhost_user_write_sync(dev, &msg, wait_for_reply);
}
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, false);
}
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, false);
}
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,
};
/*
* SET_VRING_ENABLE travels from guest to QEMU to vhost-user backend /
* control plane thread via unix domain socket. Virtio requests travel
* from guest to vhost-user backend / data plane thread via eventfd.
* Even if the guest enables the ring first, and pushes its first virtio
* request second (conforming to the virtio spec), the data plane thread
* in the backend may see the virtio request before the control plane
* thread sees the queue enablement. This causes (in fact, requires) the
* data plane thread to discard the virtio request (it arrived on a
* seemingly disabled queue). To prevent this out-of-order delivery,
* don't let the guest proceed to pushing the virtio request until the
* backend control plane acknowledges enabling the queue -- IOW, pass
* wait_for_reply=true below.
*/
ret = vhost_set_vring(dev, VHOST_USER_SET_VRING_ENABLE, &state, true);
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_set_vring_addr(struct vhost_dev *dev,
struct vhost_vring_addr *addr)
{
VhostUserMsg msg = {
.hdr.request = VHOST_USER_SET_VRING_ADDR,
.hdr.flags = VHOST_USER_VERSION,
.payload.addr = *addr,
.hdr.size = sizeof(msg.payload.addr),
};
/*
* 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);
return vhost_user_write_sync(dev, &msg, wait_for_reply);
}
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),
};
return vhost_user_write_sync(dev, &msg, wait_for_reply);
}
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,
.hdr.request = VHOST_USER_RESET_DEVICE,
};
/*
* Historically, reset was not implemented so only reset devices
* that are expecting it.
*/
if (!virtio_has_feature(dev->protocol_features,
VHOST_USER_PROTOCOL_F_RESET_DEVICE)) {
return -ENOSYS;
}
return vhost_user_write(dev, &msg, NULL, 0);
}
static int vhost_user_backend_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_backend_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 int
vhost_user_backend_handle_shared_object_add(struct vhost_dev *dev,
VhostUserShared *object)
{
QemuUUID uuid;
memcpy(uuid.data, object->uuid, sizeof(object->uuid));
return virtio_add_vhost_device(&uuid, dev);
}
static int
vhost_user_backend_handle_shared_object_remove(VhostUserShared *object)
{
QemuUUID uuid;
memcpy(uuid.data, object->uuid, sizeof(object->uuid));
return virtio_remove_resource(&uuid);
}
static bool vhost_user_send_resp(QIOChannel *ioc, VhostUserHeader *hdr,
VhostUserPayload *payload, Error **errp)
{
struct iovec iov[] = {
{ .iov_base = hdr, .iov_len = VHOST_USER_HDR_SIZE },
{ .iov_base = payload, .iov_len = hdr->size },
};
hdr->flags &= ~VHOST_USER_NEED_REPLY_MASK;
hdr->flags |= VHOST_USER_REPLY_MASK;
return !qio_channel_writev_all(ioc, iov, ARRAY_SIZE(iov), errp);
}
static bool
vhost_user_backend_send_dmabuf_fd(QIOChannel *ioc, VhostUserHeader *hdr,
VhostUserPayload *payload, Error **errp)
{
hdr->size = sizeof(payload->u64);
return vhost_user_send_resp(ioc, hdr, payload, errp);
}
int vhost_user_get_shared_object(struct vhost_dev *dev, unsigned char *uuid,
int *dmabuf_fd)
{
struct vhost_user *u = dev->opaque;
CharBackend *chr = u->user->chr;
int ret;
VhostUserMsg msg = {
.hdr.request = VHOST_USER_GET_SHARED_OBJECT,
.hdr.flags = VHOST_USER_VERSION,
};
memcpy(msg.payload.object.uuid, uuid, sizeof(msg.payload.object.uuid));
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_SHARED_OBJECT) {
error_report("Received unexpected msg type. "
"Expected %d received %d",
VHOST_USER_GET_SHARED_OBJECT, msg.hdr.request);
return -EPROTO;
}
*dmabuf_fd = qemu_chr_fe_get_msgfd(chr);
if (*dmabuf_fd < 0) {
error_report("Failed to get dmabuf fd");
return -EIO;
}
return 0;
}
static int
vhost_user_backend_handle_shared_object_lookup(struct vhost_user *u,
QIOChannel *ioc,
VhostUserHeader *hdr,
VhostUserPayload *payload)
{
QemuUUID uuid;
CharBackend *chr = u->user->chr;
Error *local_err = NULL;
int dmabuf_fd = -1;
int fd_num = 0;
memcpy(uuid.data, payload->object.uuid, sizeof(payload->object.uuid));
payload->u64 = 0;
switch (virtio_object_type(&uuid)) {
case TYPE_DMABUF:
dmabuf_fd = virtio_lookup_dmabuf(&uuid);
break;
case TYPE_VHOST_DEV:
{
struct vhost_dev *dev = virtio_lookup_vhost_device(&uuid);
if (dev == NULL) {
payload->u64 = -EINVAL;
break;
}
int ret = vhost_user_get_shared_object(dev, uuid.data, &dmabuf_fd);
if (ret < 0) {
payload->u64 = ret;
}
break;
}
case TYPE_INVALID:
payload->u64 = -EINVAL;
break;
}
if (dmabuf_fd != -1) {
fd_num++;
}
if (qemu_chr_fe_set_msgfds(chr, &dmabuf_fd, fd_num) < 0) {
error_report("Failed to set msg fds.");
payload->u64 = -EINVAL;
}
if (!vhost_user_backend_send_dmabuf_fd(ioc, hdr, payload, &local_err)) {
error_report_err(local_err);
return -EINVAL;
}
return 0;
}
static void close_backend_channel(struct vhost_user *u)
{
g_source_destroy(u->backend_src);
g_source_unref(u->backend_src);
u->backend_src = NULL;
object_unref(OBJECT(u->backend_ioc));
u->backend_ioc = NULL;
}
static gboolean backend_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_BACKEND_IOTLB_MSG:
ret = vhost_backend_handle_iotlb_msg(dev, &payload.iotlb);
break;
case VHOST_USER_BACKEND_CONFIG_CHANGE_MSG:
ret = vhost_user_backend_handle_config_change(dev);
break;
case VHOST_USER_BACKEND_VRING_HOST_NOTIFIER_MSG:
ret = vhost_user_backend_handle_vring_host_notifier(dev, &payload.area,
fd ? fd[0] : -1);
break;
case VHOST_USER_BACKEND_SHARED_OBJECT_ADD:
ret = vhost_user_backend_handle_shared_object_add(dev, &payload.object);
break;
case VHOST_USER_BACKEND_SHARED_OBJECT_REMOVE:
ret = vhost_user_backend_handle_shared_object_remove(&payload.object);
break;
case VHOST_USER_BACKEND_SHARED_OBJECT_LOOKUP:
ret = vhost_user_backend_handle_shared_object_lookup(dev->opaque, ioc,
&hdr, &payload);
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) {
payload.u64 = !!ret;
hdr.size = sizeof(payload.u64);
if (!vhost_user_send_resp(ioc, &hdr, &payload, &local_err)) {
error_report_err(local_err);
goto err;
}
}
goto fdcleanup;
err:
close_backend_channel(u);
rc = G_SOURCE_REMOVE;
fdcleanup:
if (fd) {
for (i = 0; i < fdsize; i++) {
close(fd[i]);
}
}
return rc;
}
static int vhost_setup_backend_channel(struct vhost_dev *dev)
{
VhostUserMsg msg = {
.hdr.request = VHOST_USER_SET_BACKEND_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_BACKEND_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->backend_ioc = ioc;
u->backend_src = qio_channel_add_watch_source(u->backend_ioc,
G_IO_IN | G_IO_HUP,
backend_read, dev, NULL, 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_backend_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_BACKEND_REQ) &&
virtio_has_feature(dev->protocol_features,
VHOST_USER_PROTOCOL_F_REPLY_ACK))) {
error_setg(errp, "IOMMU support requires reply-ack and "
"backend-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_backend_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->backend_ioc) {
close_backend_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 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, backend 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);
CryptoDevBackendSessionInfo *backend_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;
}
if (backend_info->op_code == VIRTIO_CRYPTO_AKCIPHER_CREATE_SESSION) {
CryptoDevBackendAsymSessionInfo *sess = &backend_info->u.asym_sess_info;
size_t keylen;
memcpy(&msg.payload.session.u.asym.session_setup_data, sess,
sizeof(CryptoDevBackendAsymSessionInfo));
if (sess->keylen) {
keylen = sizeof(msg.payload.session.u.asym.key);
if (sess->keylen > keylen) {
error_report("Unsupported asymmetric key size");
return -ENOTSUP;
}
memcpy(&msg.payload.session.u.asym.key, sess->key,
sess->keylen);
}
} else {
CryptoDevBackendSymSessionInfo *sess = &backend_info->u.sym_sess_info;
size_t keylen;
memcpy(&msg.payload.session.u.sym.session_setup_data, sess,
sizeof(CryptoDevBackendSymSessionInfo));
if (sess->key_len) {
keylen = sizeof(msg.payload.session.u.sym.key);
if (sess->key_len > keylen) {
error_report("Unsupported cipher key size");
return -ENOTSUP;
}
memcpy(&msg.payload.session.u.sym.key, sess->cipher_key,
sess->key_len);
}
if (sess->auth_key_len > 0) {
keylen = sizeof(msg.payload.session.u.sym.auth_key);
if (sess->auth_key_len > keylen) {
error_report("Unsupported auth key size");
return -ENOTSUP;
}
memcpy(&msg.payload.session.u.sym.auth_key, sess->auth_key,
sess->auth_key_len);
}
}
msg.payload.session.op_code = backend_info->op_code;
msg.payload.session.session_id = backend_info->session_id;
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_no_private_memslots(struct vhost_dev *dev)
{
return true;
}
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;
IOEventHandler *event_cb;
} 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);
} else if (data->event_cb) {
qemu_chr_fe_set_handlers(data->cd, NULL, NULL, data->event_cb,
NULL, data->dev, NULL, true);
}
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,
IOEventHandler *event_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;
data->event_cb = event_cb;
/* 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 0;
}
}
static void vhost_user_reset_status(struct vhost_dev *dev)
{
/* Set device status only for last queue pair */
if (dev->vq_index + dev->nvqs != dev->vq_index_end) {
return;
}
if (virtio_has_feature(dev->protocol_features,
VHOST_USER_PROTOCOL_F_STATUS)) {
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_backend_no_private_memslots = vhost_user_no_private_memslots,
.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_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_get_inflight_fd = vhost_user_get_inflight_fd,
.vhost_set_inflight_fd = vhost_user_set_inflight_fd,
.vhost_dev_start = vhost_user_dev_start,
.vhost_reset_status = vhost_user_reset_status,
};
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