tests/vhost-user-bridge: implement logging of dirty pages
During migration devices continue writing to the guest's memory. The writes has to be reported to QEMU. This change implements minimal support in vhost-user-bridge required for successful migration of a guest with virtio-net device. Signed-off-by: Victor Kaplansky <victork@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Victor Kaplansky
Michael S. Tsirkin
parent
8d211f622b
commit
5c93c47338
@ -13,16 +13,22 @@
|
||||
/*
|
||||
* TODO:
|
||||
* - main should get parameters from the command line.
|
||||
* - implement all request handlers.
|
||||
* - implement all request handlers. Still not implemented:
|
||||
* vubr_get_queue_num_exec()
|
||||
* vubr_send_rarp_exec()
|
||||
* - test for broken requests and virtqueue.
|
||||
* - implement features defined by Virtio 1.0 spec.
|
||||
* - support mergeable buffers and indirect descriptors.
|
||||
* - implement RESET_DEVICE request.
|
||||
* - implement clean shutdown.
|
||||
* - implement non-blocking writes to UDP backend.
|
||||
* - implement polling strategy.
|
||||
* - implement clean starting/stopping of vq processing
|
||||
* - implement clean starting/stopping of used and buffers
|
||||
* dirty page logging.
|
||||
*/
|
||||
|
||||
#define _FILE_OFFSET_BITS 64
|
||||
|
||||
#include <stddef.h>
|
||||
#include <assert.h>
|
||||
#include <stdio.h>
|
||||
@ -166,6 +172,8 @@ typedef struct VubrVirtq {
|
||||
struct vring_desc *desc;
|
||||
struct vring_avail *avail;
|
||||
struct vring_used *used;
|
||||
uint64_t log_guest_addr;
|
||||
int enable;
|
||||
} VubrVirtq;
|
||||
|
||||
/* Based on qemu/hw/virtio/vhost-user.c */
|
||||
@ -173,6 +181,8 @@ typedef struct VubrVirtq {
|
||||
#define VHOST_MEMORY_MAX_NREGIONS 8
|
||||
#define VHOST_USER_F_PROTOCOL_FEATURES 30
|
||||
|
||||
#define VHOST_LOG_PAGE 4096
|
||||
|
||||
enum VhostUserProtocolFeature {
|
||||
VHOST_USER_PROTOCOL_F_MQ = 0,
|
||||
VHOST_USER_PROTOCOL_F_LOG_SHMFD = 1,
|
||||
@ -220,6 +230,11 @@ typedef struct VhostUserMemory {
|
||||
VhostUserMemoryRegion regions[VHOST_MEMORY_MAX_NREGIONS];
|
||||
} VhostUserMemory;
|
||||
|
||||
typedef struct VhostUserLog {
|
||||
uint64_t mmap_size;
|
||||
uint64_t mmap_offset;
|
||||
} VhostUserLog;
|
||||
|
||||
typedef struct VhostUserMsg {
|
||||
VhostUserRequest request;
|
||||
|
||||
@ -234,6 +249,7 @@ typedef struct VhostUserMsg {
|
||||
struct vhost_vring_state state;
|
||||
struct vhost_vring_addr addr;
|
||||
VhostUserMemory memory;
|
||||
VhostUserLog log;
|
||||
} payload;
|
||||
int fds[VHOST_MEMORY_MAX_NREGIONS];
|
||||
int fd_num;
|
||||
@ -265,8 +281,13 @@ typedef struct VubrDev {
|
||||
uint32_t nregions;
|
||||
VubrDevRegion regions[VHOST_MEMORY_MAX_NREGIONS];
|
||||
VubrVirtq vq[MAX_NR_VIRTQUEUE];
|
||||
int log_call_fd;
|
||||
uint64_t log_size;
|
||||
uint8_t *log_table;
|
||||
int backend_udp_sock;
|
||||
struct sockaddr_in backend_udp_dest;
|
||||
int ready;
|
||||
uint64_t features;
|
||||
} VubrDev;
|
||||
|
||||
static const char *vubr_request_str[] = {
|
||||
@ -368,7 +389,12 @@ vubr_message_read(int conn_fd, VhostUserMsg *vmsg)
|
||||
|
||||
rc = recvmsg(conn_fd, &msg, 0);
|
||||
|
||||
if (rc <= 0) {
|
||||
if (rc == 0) {
|
||||
vubr_die("recvmsg");
|
||||
fprintf(stderr, "Peer disconnected.\n");
|
||||
exit(1);
|
||||
}
|
||||
if (rc < 0) {
|
||||
vubr_die("recvmsg");
|
||||
}
|
||||
|
||||
@ -395,7 +421,12 @@ vubr_message_read(int conn_fd, VhostUserMsg *vmsg)
|
||||
|
||||
if (vmsg->size) {
|
||||
rc = read(conn_fd, &vmsg->payload, vmsg->size);
|
||||
if (rc <= 0) {
|
||||
if (rc == 0) {
|
||||
vubr_die("recvmsg");
|
||||
fprintf(stderr, "Peer disconnected.\n");
|
||||
exit(1);
|
||||
}
|
||||
if (rc < 0) {
|
||||
vubr_die("recvmsg");
|
||||
}
|
||||
|
||||
@ -455,6 +486,16 @@ vubr_consume_raw_packet(VubrDev *dev, uint8_t *buf, uint32_t len)
|
||||
vubr_backend_udp_sendbuf(dev, buf + hdrlen, len - hdrlen);
|
||||
}
|
||||
|
||||
/* Kick the log_call_fd if required. */
|
||||
static void
|
||||
vubr_log_kick(VubrDev *dev)
|
||||
{
|
||||
if (dev->log_call_fd != -1) {
|
||||
DPRINT("Kicking the QEMU's log...\n");
|
||||
eventfd_write(dev->log_call_fd, 1);
|
||||
}
|
||||
}
|
||||
|
||||
/* Kick the guest if necessary. */
|
||||
static void
|
||||
vubr_virtqueue_kick(VubrVirtq *vq)
|
||||
@ -465,12 +506,40 @@ vubr_virtqueue_kick(VubrVirtq *vq)
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
vubr_log_page(uint8_t *log_table, uint64_t page)
|
||||
{
|
||||
DPRINT("Logged dirty guest page: %"PRId64"\n", page);
|
||||
atomic_or(&log_table[page / 8], 1 << (page % 8));
|
||||
}
|
||||
|
||||
static void
|
||||
vubr_log_write(VubrDev *dev, uint64_t address, uint64_t length)
|
||||
{
|
||||
uint64_t page;
|
||||
|
||||
if (!(dev->features & (1ULL << VHOST_F_LOG_ALL)) ||
|
||||
!dev->log_table || !length) {
|
||||
return;
|
||||
}
|
||||
|
||||
assert(dev->log_size > ((address + length - 1) / VHOST_LOG_PAGE / 8));
|
||||
|
||||
page = address / VHOST_LOG_PAGE;
|
||||
while (page * VHOST_LOG_PAGE < address + length) {
|
||||
vubr_log_page(dev->log_table, page);
|
||||
page += VHOST_LOG_PAGE;
|
||||
}
|
||||
vubr_log_kick(dev);
|
||||
}
|
||||
|
||||
static void
|
||||
vubr_post_buffer(VubrDev *dev, VubrVirtq *vq, uint8_t *buf, int32_t len)
|
||||
{
|
||||
struct vring_desc *desc = vq->desc;
|
||||
struct vring_desc *desc = vq->desc;
|
||||
struct vring_avail *avail = vq->avail;
|
||||
struct vring_used *used = vq->used;
|
||||
struct vring_used *used = vq->used;
|
||||
uint64_t log_guest_addr = vq->log_guest_addr;
|
||||
|
||||
unsigned int size = vq->size;
|
||||
|
||||
@ -510,6 +579,7 @@ vubr_post_buffer(VubrDev *dev, VubrVirtq *vq, uint8_t *buf, int32_t len)
|
||||
|
||||
if (len <= chunk_len) {
|
||||
memcpy(chunk_start, buf, len);
|
||||
vubr_log_write(dev, desc[i].addr, len);
|
||||
} else {
|
||||
fprintf(stderr,
|
||||
"Received too long packet from the backend. Dropping...\n");
|
||||
@ -519,11 +589,17 @@ vubr_post_buffer(VubrDev *dev, VubrVirtq *vq, uint8_t *buf, int32_t len)
|
||||
/* Add descriptor to the used ring. */
|
||||
used->ring[u_index].id = d_index;
|
||||
used->ring[u_index].len = len;
|
||||
vubr_log_write(dev,
|
||||
log_guest_addr + offsetof(struct vring_used, ring[u_index]),
|
||||
sizeof(used->ring[u_index]));
|
||||
|
||||
vq->last_avail_index++;
|
||||
vq->last_used_index++;
|
||||
|
||||
atomic_mb_set(&used->idx, vq->last_used_index);
|
||||
vubr_log_write(dev,
|
||||
log_guest_addr + offsetof(struct vring_used, idx),
|
||||
sizeof(used->idx));
|
||||
|
||||
/* Kick the guest if necessary. */
|
||||
vubr_virtqueue_kick(vq);
|
||||
@ -532,9 +608,10 @@ vubr_post_buffer(VubrDev *dev, VubrVirtq *vq, uint8_t *buf, int32_t len)
|
||||
static int
|
||||
vubr_process_desc(VubrDev *dev, VubrVirtq *vq)
|
||||
{
|
||||
struct vring_desc *desc = vq->desc;
|
||||
struct vring_desc *desc = vq->desc;
|
||||
struct vring_avail *avail = vq->avail;
|
||||
struct vring_used *used = vq->used;
|
||||
struct vring_used *used = vq->used;
|
||||
uint64_t log_guest_addr = vq->log_guest_addr;
|
||||
|
||||
unsigned int size = vq->size;
|
||||
|
||||
@ -552,6 +629,8 @@ vubr_process_desc(VubrDev *dev, VubrVirtq *vq)
|
||||
void *chunk_start = (void *)gpa_to_va(dev, desc[i].addr);
|
||||
uint32_t chunk_len = desc[i].len;
|
||||
|
||||
assert(!(desc[i].flags & VRING_DESC_F_WRITE));
|
||||
|
||||
if (len + chunk_len < buf_size) {
|
||||
memcpy(buf + len, chunk_start, chunk_len);
|
||||
DPRINT("%d ", chunk_len);
|
||||
@ -577,6 +656,9 @@ vubr_process_desc(VubrDev *dev, VubrVirtq *vq)
|
||||
/* Add descriptor to the used ring. */
|
||||
used->ring[u_index].id = d_index;
|
||||
used->ring[u_index].len = len;
|
||||
vubr_log_write(dev,
|
||||
log_guest_addr + offsetof(struct vring_used, ring[u_index]),
|
||||
sizeof(used->ring[u_index]));
|
||||
|
||||
vubr_consume_raw_packet(dev, buf, len);
|
||||
|
||||
@ -588,6 +670,7 @@ vubr_process_avail(VubrDev *dev, VubrVirtq *vq)
|
||||
{
|
||||
struct vring_avail *avail = vq->avail;
|
||||
struct vring_used *used = vq->used;
|
||||
uint64_t log_guest_addr = vq->log_guest_addr;
|
||||
|
||||
while (vq->last_avail_index != atomic_mb_read(&avail->idx)) {
|
||||
vubr_process_desc(dev, vq);
|
||||
@ -596,6 +679,9 @@ vubr_process_avail(VubrDev *dev, VubrVirtq *vq)
|
||||
}
|
||||
|
||||
atomic_mb_set(&used->idx, vq->last_used_index);
|
||||
vubr_log_write(dev,
|
||||
log_guest_addr + offsetof(struct vring_used, idx),
|
||||
sizeof(used->idx));
|
||||
}
|
||||
|
||||
static void
|
||||
@ -609,6 +695,10 @@ vubr_backend_recv_cb(int sock, void *ctx)
|
||||
int buflen = sizeof(buf);
|
||||
int len;
|
||||
|
||||
if (!dev->ready) {
|
||||
return;
|
||||
}
|
||||
|
||||
DPRINT("\n\n *** IN UDP RECEIVE CALLBACK ***\n\n");
|
||||
|
||||
uint16_t avail_index = atomic_mb_read(&rx_vq->avail->idx);
|
||||
@ -656,14 +746,14 @@ vubr_get_features_exec(VubrDev *dev, VhostUserMsg *vmsg)
|
||||
{
|
||||
vmsg->payload.u64 =
|
||||
((1ULL << VIRTIO_NET_F_MRG_RXBUF) |
|
||||
(1ULL << VIRTIO_NET_F_CTRL_VQ) |
|
||||
(1ULL << VIRTIO_NET_F_CTRL_RX) |
|
||||
(1ULL << VHOST_F_LOG_ALL));
|
||||
(1ULL << VHOST_F_LOG_ALL) |
|
||||
(1ULL << VHOST_USER_F_PROTOCOL_FEATURES));
|
||||
|
||||
vmsg->size = sizeof(vmsg->payload.u64);
|
||||
|
||||
DPRINT("Sending back to guest u64: 0x%016"PRIx64"\n", vmsg->payload.u64);
|
||||
|
||||
/* reply */
|
||||
/* Reply */
|
||||
return 1;
|
||||
}
|
||||
|
||||
@ -671,6 +761,7 @@ static int
|
||||
vubr_set_features_exec(VubrDev *dev, VhostUserMsg *vmsg)
|
||||
{
|
||||
DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64);
|
||||
dev->features = vmsg->payload.u64;
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -680,10 +771,28 @@ vubr_set_owner_exec(VubrDev *dev, VhostUserMsg *vmsg)
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void
|
||||
vubr_close_log(VubrDev *dev)
|
||||
{
|
||||
if (dev->log_table) {
|
||||
if (munmap(dev->log_table, dev->log_size) != 0) {
|
||||
vubr_die("munmap()");
|
||||
}
|
||||
|
||||
dev->log_table = 0;
|
||||
}
|
||||
if (dev->log_call_fd != -1) {
|
||||
close(dev->log_call_fd);
|
||||
dev->log_call_fd = -1;
|
||||
}
|
||||
}
|
||||
|
||||
static int
|
||||
vubr_reset_device_exec(VubrDev *dev, VhostUserMsg *vmsg)
|
||||
{
|
||||
DPRINT("Function %s() not implemented yet.\n", __func__);
|
||||
vubr_close_log(dev);
|
||||
dev->ready = 0;
|
||||
dev->features = 0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -710,9 +819,9 @@ vubr_set_mem_table_exec(VubrDev *dev, VhostUserMsg *vmsg)
|
||||
DPRINT(" mmap_offset 0x%016"PRIx64"\n",
|
||||
msg_region->mmap_offset);
|
||||
|
||||
dev_region->gpa = msg_region->guest_phys_addr;
|
||||
dev_region->size = msg_region->memory_size;
|
||||
dev_region->qva = msg_region->userspace_addr;
|
||||
dev_region->gpa = msg_region->guest_phys_addr;
|
||||
dev_region->size = msg_region->memory_size;
|
||||
dev_region->qva = msg_region->userspace_addr;
|
||||
dev_region->mmap_offset = msg_region->mmap_offset;
|
||||
|
||||
/* We don't use offset argument of mmap() since the
|
||||
@ -736,14 +845,38 @@ vubr_set_mem_table_exec(VubrDev *dev, VhostUserMsg *vmsg)
|
||||
static int
|
||||
vubr_set_log_base_exec(VubrDev *dev, VhostUserMsg *vmsg)
|
||||
{
|
||||
DPRINT("Function %s() not implemented yet.\n", __func__);
|
||||
return 0;
|
||||
int fd;
|
||||
uint64_t log_mmap_size, log_mmap_offset;
|
||||
void *rc;
|
||||
|
||||
assert(vmsg->fd_num == 1);
|
||||
fd = vmsg->fds[0];
|
||||
|
||||
assert(vmsg->size == sizeof(vmsg->payload.log));
|
||||
log_mmap_offset = vmsg->payload.log.mmap_offset;
|
||||
log_mmap_size = vmsg->payload.log.mmap_size;
|
||||
DPRINT("Log mmap_offset: %"PRId64"\n", log_mmap_offset);
|
||||
DPRINT("Log mmap_size: %"PRId64"\n", log_mmap_size);
|
||||
|
||||
rc = mmap(0, log_mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd,
|
||||
log_mmap_offset);
|
||||
if (rc == MAP_FAILED) {
|
||||
vubr_die("mmap");
|
||||
}
|
||||
dev->log_table = rc;
|
||||
dev->log_size = log_mmap_size;
|
||||
|
||||
vmsg->size = sizeof(vmsg->payload.u64);
|
||||
/* Reply */
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int
|
||||
vubr_set_log_fd_exec(VubrDev *dev, VhostUserMsg *vmsg)
|
||||
{
|
||||
DPRINT("Function %s() not implemented yet.\n", __func__);
|
||||
assert(vmsg->fd_num == 1);
|
||||
dev->log_call_fd = vmsg->fds[0];
|
||||
DPRINT("Got log_call_fd: %d\n", vmsg->fds[0]);
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -777,6 +910,7 @@ vubr_set_vring_addr_exec(VubrDev *dev, VhostUserMsg *vmsg)
|
||||
vq->desc = (struct vring_desc *)qva_to_va(dev, vra->desc_user_addr);
|
||||
vq->used = (struct vring_used *)qva_to_va(dev, vra->used_user_addr);
|
||||
vq->avail = (struct vring_avail *)qva_to_va(dev, vra->avail_user_addr);
|
||||
vq->log_guest_addr = vra->log_guest_addr;
|
||||
|
||||
DPRINT("Setting virtq addresses:\n");
|
||||
DPRINT(" vring_desc at %p\n", vq->desc);
|
||||
@ -803,8 +937,18 @@ vubr_set_vring_base_exec(VubrDev *dev, VhostUserMsg *vmsg)
|
||||
static int
|
||||
vubr_get_vring_base_exec(VubrDev *dev, VhostUserMsg *vmsg)
|
||||
{
|
||||
DPRINT("Function %s() not implemented yet.\n", __func__);
|
||||
return 0;
|
||||
unsigned int index = vmsg->payload.state.index;
|
||||
|
||||
DPRINT("State.index: %d\n", index);
|
||||
vmsg->payload.state.num = dev->vq[index].last_avail_index;
|
||||
vmsg->size = sizeof(vmsg->payload.state);
|
||||
/* FIXME: this is a work-around for a bug in QEMU enabling
|
||||
* too early vrings. When protocol features are enabled,
|
||||
* we have to respect * VHOST_USER_SET_VRING_ENABLE request. */
|
||||
dev->ready = 0;
|
||||
|
||||
/* Reply */
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int
|
||||
@ -829,7 +973,17 @@ vubr_set_vring_kick_exec(VubrDev *dev, VhostUserMsg *vmsg)
|
||||
DPRINT("Waiting for kicks on fd: %d for vq: %d\n",
|
||||
dev->vq[index].kick_fd, index);
|
||||
}
|
||||
/* We temporarily use this hack to determine that both TX and RX
|
||||
* queues are set up and ready for processing.
|
||||
* FIXME: we need to rely in VHOST_USER_SET_VRING_ENABLE and
|
||||
* actual kicks. */
|
||||
if (dev->vq[0].kick_fd != -1 &&
|
||||
dev->vq[1].kick_fd != -1) {
|
||||
dev->ready = 1;
|
||||
DPRINT("vhost-user-bridge is ready for processing queues.\n");
|
||||
}
|
||||
return 0;
|
||||
|
||||
}
|
||||
|
||||
static int
|
||||
@ -858,9 +1012,12 @@ vubr_set_vring_err_exec(VubrDev *dev, VhostUserMsg *vmsg)
|
||||
static int
|
||||
vubr_get_protocol_features_exec(VubrDev *dev, VhostUserMsg *vmsg)
|
||||
{
|
||||
/* FIXME: unimplented */
|
||||
vmsg->payload.u64 = 1ULL << VHOST_USER_PROTOCOL_F_LOG_SHMFD;
|
||||
DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64);
|
||||
return 0;
|
||||
vmsg->size = sizeof(vmsg->payload.u64);
|
||||
|
||||
/* Reply */
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int
|
||||
@ -881,7 +1038,12 @@ vubr_get_queue_num_exec(VubrDev *dev, VhostUserMsg *vmsg)
|
||||
static int
|
||||
vubr_set_vring_enable_exec(VubrDev *dev, VhostUserMsg *vmsg)
|
||||
{
|
||||
DPRINT("Function %s() not implemented yet.\n", __func__);
|
||||
unsigned int index = vmsg->payload.state.index;
|
||||
unsigned int enable = vmsg->payload.state.num;
|
||||
|
||||
DPRINT("State.index: %d\n", index);
|
||||
DPRINT("State.enable: %d\n", enable);
|
||||
dev->vq[index].enable = enable;
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -987,7 +1149,7 @@ vubr_accept_cb(int sock, void *ctx)
|
||||
socklen_t len = sizeof(un);
|
||||
|
||||
conn_fd = accept(sock, (struct sockaddr *) &un, &len);
|
||||
if (conn_fd == -1) {
|
||||
if (conn_fd == -1) {
|
||||
vubr_die("accept()");
|
||||
}
|
||||
DPRINT("Got connection from remote peer on sock %d\n", conn_fd);
|
||||
@ -1009,9 +1171,17 @@ vubr_new(const char *path)
|
||||
.size = 0,
|
||||
.last_avail_index = 0, .last_used_index = 0,
|
||||
.desc = 0, .avail = 0, .used = 0,
|
||||
.enable = 0,
|
||||
};
|
||||
}
|
||||
|
||||
/* Init log */
|
||||
dev->log_call_fd = -1;
|
||||
dev->log_size = 0;
|
||||
dev->log_table = 0;
|
||||
dev->ready = 0;
|
||||
dev->features = 0;
|
||||
|
||||
/* Get a UNIX socket. */
|
||||
dev->sock = socket(AF_UNIX, SOCK_STREAM, 0);
|
||||
if (dev->sock == -1) {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user