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vhost-user.c
2461 lines (2081 loc) · 74.4 KB
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vhost-user.c
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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/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/cryptodev.h"
#include "migration/migration.h"
#include "migration/postcopy-ram.h"
#include "trace.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_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_PPC_64)
#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_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_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) {
error_report("Failed to read msg header. Read %d instead of %d."
" Original request %d.", r, size, msg->hdr.request);
return -1;
}
/* 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 -1;
}
return 0;
}
struct vhost_user_read_cb_data {
struct vhost_dev *dev;
VhostUserMsg *msg;
GMainLoop *loop;
int ret;
};
static gboolean vhost_user_read_cb(GIOChannel *source, 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;
if (vhost_user_read_header(dev, msg) < 0) {
data->ret = -1;
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 = -1;
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) {
error_report("Failed to read msg payload."
" Read %d instead of %d.", r, msg->hdr.size);
data->ret = -1;
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)
{
VhostUserMsg msg_reply;
if ((msg->hdr.flags & VHOST_USER_NEED_REPLY_MASK) == 0) {
return 0;
}
if (vhost_user_read(dev, &msg_reply) < 0) {
return -1;
}
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 -1;
}
return msg_reply.payload.u64 ? -1 : 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 -1;
}
ret = qemu_chr_fe_write_all(chr, (const uint8_t *) msg, size);
if (ret != size) {
error_report("Failed to write msg."
" Wrote %d instead of %d.", ret, size);
return -1;
}
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);
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;
}
if (vhost_user_write(dev, &msg, fds, fd_num) < 0) {
return -1;
}
if (shmfd) {
msg.hdr.size = 0;
if (vhost_user_read(dev, &msg) < 0) {
return -1;
}
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 -1;
}
}
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 -1;
}
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 -1;
}
msg->hdr.size = sizeof(msg->payload.memory.nregions);
msg->hdr.size += sizeof(msg->payload.memory.padding);
msg->hdr.size += *fd_num * sizeof(VhostUserMemoryRegion);
return 1;
}
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;
if (vhost_user_write(dev, msg, &fd, 1) < 0) {
return -1;
}
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;
if (vhost_user_write(dev, msg, &fd, 1) < 0) {
return -1;
}
if (track_ramblocks) {
uint64_t reply_gpa;
if (vhost_user_read(dev, &msg_reply) < 0) {
return -1;
}
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 -1;
}
/*
* 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 -1;
}
/* 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 -1;
}
} 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;
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 && send_remove_regions(dev, rem_reg, nr_rem_reg, msg,
reply_supported) < 0)
{
goto err;
}
if (nr_add_reg && send_add_regions(dev, add_reg, nr_add_reg, msg,
shadow_pcb, reply_supported, track_ramblocks) < 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 */
if (vhost_user_write(dev, msg, NULL, 0) < 0) {
return -1;
}
}
return 0;
err:
if (track_ramblocks) {
memcpy(u->postcopy_client_bases, shadow_pcb,
sizeof(uint64_t) * VHOST_USER_MAX_RAM_SLOTS);
}
return -1;
}
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;
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) {
if (vhost_user_add_remove_regions(dev, &msg, reply_supported,
true) < 0) {
return -1;
}
} else {
if (vhost_user_fill_set_mem_table_msg(u, dev, &msg, fds, &fd_num,
true) < 0) {
return -1;
}
if (vhost_user_write(dev, &msg, fds, fd_num) < 0) {
return -1;
}
if (vhost_user_read(dev, &msg_reply) < 0) {
return -1;
}
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 -1;
}
/*
* 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 -1;
}
memset(u->postcopy_client_bases, 0,