#include "qemu/osdep.h"
#include "qapi/error.h"
-#include "qemu-common.h"
-#include "block/block.h"
#include "qemu/error-report.h"
-#include "qemu/main-loop.h"
-#include "hw/hw.h"
#include "qemu/cutils.h"
#include "qemu/queue.h"
-#include "qemu/timer.h"
-#include "migration/block.h"
-#include "migration/migration.h"
-#include "sysemu/blockdev.h"
+#include "block.h"
+#include "migration/misc.h"
+#include "migration.h"
+#include "migration/register.h"
+#include "qemu-file.h"
+#include "migration/vmstate.h"
#include "sysemu/block-backend.h"
#define BLOCK_SIZE (1 << 20)
#define BLK_MIG_FLAG_PROGRESS 0x04
#define BLK_MIG_FLAG_ZERO_BLOCK 0x08
-#define MAX_IS_ALLOCATED_SEARCH 65536
+#define MAX_IS_ALLOCATED_SEARCH (65536 * BDRV_SECTOR_SIZE)
-#define MAX_INFLIGHT_IO 512
+#define MAX_IO_BUFFERS 512
+#define MAX_PARALLEL_IO 16
//#define DEBUG_BLK_MIGRATION
typedef struct BlkMigDevState {
/* Written during setup phase. Can be read without a lock. */
- BlockDriverState *bs;
+ BlockBackend *blk;
+ char *blk_name;
int shared_base;
int64_t total_sectors;
QSIMPLEQ_ENTRY(BlkMigDevState) entry;
} BlkMigBlock;
typedef struct BlkMigState {
- /* Written during setup phase. Can be read without a lock. */
- int blk_enable;
- int shared_base;
QSIMPLEQ_HEAD(bmds_list, BlkMigDevState) bmds_list;
int64_t total_sector_sum;
bool zero_blocks;
| flags);
/* device name */
- len = strlen(bdrv_get_device_name(blk->bmds->bs));
+ len = strlen(blk->bmds->blk_name);
qemu_put_byte(f, len);
- qemu_put_buffer(f, (uint8_t *)bdrv_get_device_name(blk->bmds->bs), len);
+ qemu_put_buffer(f, (uint8_t *) blk->bmds->blk_name, len);
/* if a block is zero we need to flush here since the network
* bandwidth is now a lot higher than the storage device bandwidth.
return !QSIMPLEQ_EMPTY(&block_mig_state.bmds_list);
}
+int blk_mig_bulk_active(void)
+{
+ return blk_mig_active() && !block_mig_state.bulk_completed;
+}
+
uint64_t blk_mig_bytes_transferred(void)
{
BlkMigDevState *bmds;
{
int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK;
- if (sector < bdrv_nb_sectors(bmds->bs)) {
+ if (sector < blk_nb_sectors(bmds->blk)) {
return !!(bmds->aio_bitmap[chunk / (sizeof(unsigned long) * 8)] &
(1UL << (chunk % (sizeof(unsigned long) * 8))));
} else {
static void alloc_aio_bitmap(BlkMigDevState *bmds)
{
- BlockDriverState *bs = bmds->bs;
+ BlockBackend *bb = bmds->blk;
int64_t bitmap_size;
- bitmap_size = bdrv_nb_sectors(bs) + BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1;
+ bitmap_size = blk_nb_sectors(bb) + BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1;
bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
bmds->aio_bitmap = g_malloc0(bitmap_size);
{
int64_t total_sectors = bmds->total_sectors;
int64_t cur_sector = bmds->cur_sector;
- BlockDriverState *bs = bmds->bs;
+ BlockBackend *bb = bmds->blk;
BlkMigBlock *blk;
int nr_sectors;
+ int64_t count;
if (bmds->shared_base) {
qemu_mutex_lock_iothread();
- aio_context_acquire(bdrv_get_aio_context(bs));
+ aio_context_acquire(blk_get_aio_context(bb));
+ /* Skip unallocated sectors; intentionally treats failure or
+ * partial sector as an allocated sector */
while (cur_sector < total_sectors &&
- !bdrv_is_allocated(bs, cur_sector, MAX_IS_ALLOCATED_SEARCH,
- &nr_sectors)) {
- cur_sector += nr_sectors;
+ !bdrv_is_allocated(blk_bs(bb), cur_sector * BDRV_SECTOR_SIZE,
+ MAX_IS_ALLOCATED_SEARCH, &count)) {
+ if (count < BDRV_SECTOR_SIZE) {
+ break;
+ }
+ cur_sector += count >> BDRV_SECTOR_BITS;
}
- aio_context_release(bdrv_get_aio_context(bs));
+ aio_context_release(blk_get_aio_context(bb));
qemu_mutex_unlock_iothread();
}
* without the need to acquire the AioContext.
*/
qemu_mutex_lock_iothread();
- aio_context_acquire(bdrv_get_aio_context(bmds->bs));
- blk->aiocb = bdrv_aio_readv(bs, cur_sector, &blk->qiov,
- nr_sectors, blk_mig_read_cb, blk);
-
- bdrv_reset_dirty_bitmap(bmds->dirty_bitmap, cur_sector, nr_sectors);
- aio_context_release(bdrv_get_aio_context(bmds->bs));
+ aio_context_acquire(blk_get_aio_context(bmds->blk));
+ bdrv_reset_dirty_bitmap(bmds->dirty_bitmap, cur_sector * BDRV_SECTOR_SIZE,
+ nr_sectors * BDRV_SECTOR_SIZE);
+ blk->aiocb = blk_aio_preadv(bb, cur_sector * BDRV_SECTOR_SIZE, &blk->qiov,
+ 0, blk_mig_read_cb, blk);
+ aio_context_release(blk_get_aio_context(bmds->blk));
qemu_mutex_unlock_iothread();
bmds->cur_sector = cur_sector + nr_sectors;
int ret;
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
- aio_context_acquire(bdrv_get_aio_context(bmds->bs));
- bmds->dirty_bitmap = bdrv_create_dirty_bitmap(bmds->bs, BLOCK_SIZE,
- NULL, NULL);
- aio_context_release(bdrv_get_aio_context(bmds->bs));
+ bmds->dirty_bitmap = bdrv_create_dirty_bitmap(blk_bs(bmds->blk),
+ BLOCK_SIZE, NULL, NULL);
if (!bmds->dirty_bitmap) {
ret = -errno;
goto fail;
fail:
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
if (bmds->dirty_bitmap) {
- aio_context_acquire(bdrv_get_aio_context(bmds->bs));
- bdrv_release_dirty_bitmap(bmds->bs, bmds->dirty_bitmap);
- aio_context_release(bdrv_get_aio_context(bmds->bs));
+ bdrv_release_dirty_bitmap(blk_bs(bmds->blk), bmds->dirty_bitmap);
}
}
return ret;
BlkMigDevState *bmds;
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
- aio_context_acquire(bdrv_get_aio_context(bmds->bs));
- bdrv_release_dirty_bitmap(bmds->bs, bmds->dirty_bitmap);
- aio_context_release(bdrv_get_aio_context(bmds->bs));
+ bdrv_release_dirty_bitmap(blk_bs(bmds->blk), bmds->dirty_bitmap);
}
}
-static void init_blk_migration(QEMUFile *f)
+static int init_blk_migration(QEMUFile *f)
{
BlockDriverState *bs;
BlkMigDevState *bmds;
int64_t sectors;
BdrvNextIterator it;
+ int i, num_bs = 0;
+ struct {
+ BlkMigDevState *bmds;
+ BlockDriverState *bs;
+ } *bmds_bs;
+ Error *local_err = NULL;
+ int ret;
block_mig_state.submitted = 0;
block_mig_state.read_done = 0;
block_mig_state.bulk_completed = 0;
block_mig_state.zero_blocks = migrate_zero_blocks();
-
for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) {
+ num_bs++;
+ }
+ bmds_bs = g_malloc0(num_bs * sizeof(*bmds_bs));
+
+ for (i = 0, bs = bdrv_first(&it); bs; bs = bdrv_next(&it), i++) {
if (bdrv_is_read_only(bs)) {
continue;
}
sectors = bdrv_nb_sectors(bs);
if (sectors <= 0) {
- return;
+ ret = sectors;
+ bdrv_next_cleanup(&it);
+ goto out;
}
bmds = g_new0(BlkMigDevState, 1);
- bmds->bs = bs;
+ bmds->blk = blk_new(BLK_PERM_CONSISTENT_READ, BLK_PERM_ALL);
+ bmds->blk_name = g_strdup(bdrv_get_device_name(bs));
bmds->bulk_completed = 0;
bmds->total_sectors = sectors;
bmds->completed_sectors = 0;
- bmds->shared_base = block_mig_state.shared_base;
- alloc_aio_bitmap(bmds);
- error_setg(&bmds->blocker, "block device is in use by migration");
- bdrv_op_block_all(bs, bmds->blocker);
- bdrv_ref(bs);
+ bmds->shared_base = migrate_use_block_incremental();
+
+ assert(i < num_bs);
+ bmds_bs[i].bmds = bmds;
+ bmds_bs[i].bs = bs;
block_mig_state.total_sector_sum += sectors;
QSIMPLEQ_INSERT_TAIL(&block_mig_state.bmds_list, bmds, entry);
}
+
+ /* Can only insert new BDSes now because doing so while iterating block
+ * devices may end up in a deadlock (iterating the new BDSes, too). */
+ for (i = 0; i < num_bs; i++) {
+ BlkMigDevState *bmds = bmds_bs[i].bmds;
+ BlockDriverState *bs = bmds_bs[i].bs;
+
+ if (bmds) {
+ ret = blk_insert_bs(bmds->blk, bs, &local_err);
+ if (ret < 0) {
+ error_report_err(local_err);
+ goto out;
+ }
+
+ alloc_aio_bitmap(bmds);
+ error_setg(&bmds->blocker, "block device is in use by migration");
+ bdrv_op_block_all(bs, bmds->blocker);
+ }
+ }
+
+ ret = 0;
+out:
+ g_free(bmds_bs);
+ return ret;
}
/* Called with no lock taken. */
int is_async)
{
BlkMigBlock *blk;
+ BlockDriverState *bs = blk_bs(bmds->blk);
int64_t total_sectors = bmds->total_sectors;
int64_t sector;
int nr_sectors;
blk_mig_lock();
if (bmds_aio_inflight(bmds, sector)) {
blk_mig_unlock();
- bdrv_drain(bmds->bs);
+ blk_drain(bmds->blk);
} else {
blk_mig_unlock();
}
- if (bdrv_get_dirty(bmds->bs, bmds->dirty_bitmap, sector)) {
-
+ bdrv_dirty_bitmap_lock(bmds->dirty_bitmap);
+ if (bdrv_get_dirty_locked(bs, bmds->dirty_bitmap,
+ sector * BDRV_SECTOR_SIZE)) {
if (total_sectors - sector < BDRV_SECTORS_PER_DIRTY_CHUNK) {
nr_sectors = total_sectors - sector;
} else {
nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK;
}
+ bdrv_reset_dirty_bitmap_locked(bmds->dirty_bitmap,
+ sector * BDRV_SECTOR_SIZE,
+ nr_sectors * BDRV_SECTOR_SIZE);
+ bdrv_dirty_bitmap_unlock(bmds->dirty_bitmap);
+
blk = g_new(BlkMigBlock, 1);
blk->buf = g_malloc(BLOCK_SIZE);
blk->bmds = bmds;
blk->iov.iov_len = nr_sectors * BDRV_SECTOR_SIZE;
qemu_iovec_init_external(&blk->qiov, &blk->iov, 1);
- blk->aiocb = bdrv_aio_readv(bmds->bs, sector, &blk->qiov,
- nr_sectors, blk_mig_read_cb, blk);
+ blk->aiocb = blk_aio_preadv(bmds->blk,
+ sector * BDRV_SECTOR_SIZE,
+ &blk->qiov, 0, blk_mig_read_cb,
+ blk);
blk_mig_lock();
block_mig_state.submitted++;
bmds_set_aio_inflight(bmds, sector, nr_sectors, 1);
blk_mig_unlock();
} else {
- ret = bdrv_read(bmds->bs, sector, blk->buf, nr_sectors);
+ ret = blk_pread(bmds->blk, sector * BDRV_SECTOR_SIZE, blk->buf,
+ nr_sectors * BDRV_SECTOR_SIZE);
if (ret < 0) {
goto error;
}
g_free(blk);
}
- bdrv_reset_dirty_bitmap(bmds->dirty_bitmap, sector, nr_sectors);
+ sector += nr_sectors;
+ bmds->cur_dirty = sector;
break;
}
+
+ bdrv_dirty_bitmap_unlock(bmds->dirty_bitmap);
sector += BDRV_SECTORS_PER_DIRTY_CHUNK;
bmds->cur_dirty = sector;
}
int ret = 1;
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
- aio_context_acquire(bdrv_get_aio_context(bmds->bs));
+ aio_context_acquire(blk_get_aio_context(bmds->blk));
ret = mig_save_device_dirty(f, bmds, is_async);
- aio_context_release(bdrv_get_aio_context(bmds->bs));
+ aio_context_release(blk_get_aio_context(bmds->blk));
if (ret <= 0) {
break;
}
int ret = 0;
DPRINTF("%s Enter submitted %d read_done %d transferred %d\n",
- __FUNCTION__, block_mig_state.submitted, block_mig_state.read_done,
+ __func__, block_mig_state.submitted, block_mig_state.read_done,
block_mig_state.transferred);
blk_mig_lock();
}
blk_mig_unlock();
- DPRINTF("%s Exit submitted %d read_done %d transferred %d\n", __FUNCTION__,
+ DPRINTF("%s Exit submitted %d read_done %d transferred %d\n", __func__,
block_mig_state.submitted, block_mig_state.read_done,
block_mig_state.transferred);
return ret;
int64_t dirty = 0;
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
- aio_context_acquire(bdrv_get_aio_context(bmds->bs));
+ aio_context_acquire(blk_get_aio_context(bmds->blk));
dirty += bdrv_get_dirty_count(bmds->dirty_bitmap);
- aio_context_release(bdrv_get_aio_context(bmds->bs));
+ aio_context_release(blk_get_aio_context(bmds->blk));
}
- return dirty << BDRV_SECTOR_BITS;
+ return dirty;
}
-/* Called with iothread lock taken. */
-static void block_migration_cleanup(void *opaque)
+
+/* Called with iothread lock taken. */
+static void block_migration_cleanup_bmds(void)
{
BlkMigDevState *bmds;
- BlkMigBlock *blk;
AioContext *ctx;
- bdrv_drain_all();
-
unset_dirty_tracking();
while ((bmds = QSIMPLEQ_FIRST(&block_mig_state.bmds_list)) != NULL) {
QSIMPLEQ_REMOVE_HEAD(&block_mig_state.bmds_list, entry);
- bdrv_op_unblock_all(bmds->bs, bmds->blocker);
+ bdrv_op_unblock_all(blk_bs(bmds->blk), bmds->blocker);
error_free(bmds->blocker);
- /* Save ctx, because bmds->bs can disappear during bdrv_unref. */
- ctx = bdrv_get_aio_context(bmds->bs);
+ /* Save ctx, because bmds->blk can disappear during blk_unref. */
+ ctx = blk_get_aio_context(bmds->blk);
aio_context_acquire(ctx);
- bdrv_unref(bmds->bs);
+ blk_unref(bmds->blk);
aio_context_release(ctx);
+ g_free(bmds->blk_name);
g_free(bmds->aio_bitmap);
g_free(bmds);
}
+}
+
+/* Called with iothread lock taken. */
+static void block_migration_cleanup(void *opaque)
+{
+ BlkMigBlock *blk;
+
+ bdrv_drain_all();
+
+ block_migration_cleanup_bmds();
blk_mig_lock();
while ((blk = QSIMPLEQ_FIRST(&block_mig_state.blk_list)) != NULL) {
block_mig_state.submitted, block_mig_state.transferred);
qemu_mutex_lock_iothread();
- init_blk_migration(f);
+ ret = init_blk_migration(f);
+ if (ret < 0) {
+ qemu_mutex_unlock_iothread();
+ return ret;
+ }
/* start track dirty blocks */
ret = set_dirty_tracking();
/* control the rate of transfer */
blk_mig_lock();
- while ((block_mig_state.submitted +
- block_mig_state.read_done) * BLOCK_SIZE <
+ while (block_mig_state.read_done * BLOCK_SIZE <
qemu_file_get_rate_limit(f) &&
- (block_mig_state.submitted +
- block_mig_state.read_done) <
- MAX_INFLIGHT_IO) {
+ block_mig_state.submitted < MAX_PARALLEL_IO &&
+ (block_mig_state.submitted + block_mig_state.read_done) <
+ MAX_IO_BUFFERS) {
blk_mig_unlock();
if (block_mig_state.bulk_completed == 0) {
/* first finish the bulk phase */
qemu_put_be64(f, BLK_MIG_FLAG_EOS);
+ /* Make sure that our BlockBackends are gone, so that the block driver
+ * nodes can be inactivated. */
+ block_migration_cleanup_bmds();
+
return 0;
}
static void block_save_pending(QEMUFile *f, void *opaque, uint64_t max_size,
- uint64_t *non_postcopiable_pending,
- uint64_t *postcopiable_pending)
+ uint64_t *res_precopy_only,
+ uint64_t *res_compatible,
+ uint64_t *res_postcopy_only)
{
/* Estimate pending number of bytes to send */
uint64_t pending;
DPRINTF("Enter save live pending %" PRIu64 "\n", pending);
/* We don't do postcopy */
- *non_postcopiable_pending += pending;
+ *res_precopy_only += pending;
}
static int block_load(QEMUFile *f, void *opaque, int version_id)
int len, flags;
char device_name[256];
int64_t addr;
- BlockDriverState *bs, *bs_prev = NULL;
- BlockBackend *blk;
+ BlockBackend *blk, *blk_prev = NULL;
Error *local_err = NULL;
uint8_t *buf;
int64_t total_sectors = 0;
int nr_sectors;
int ret;
+ BlockDriverInfo bdi;
+ int cluster_size = BLOCK_SIZE;
do {
addr = qemu_get_be64(f);
device_name);
return -EINVAL;
}
- bs = blk_bs(blk);
- if (!bs) {
- fprintf(stderr, "Block device %s has no medium\n",
- device_name);
- return -EINVAL;
- }
- if (bs != bs_prev) {
- bs_prev = bs;
- total_sectors = bdrv_nb_sectors(bs);
+ if (blk != blk_prev) {
+ blk_prev = blk;
+ total_sectors = blk_nb_sectors(blk);
if (total_sectors <= 0) {
error_report("Error getting length of block device %s",
device_name);
return -EINVAL;
}
- bdrv_invalidate_cache(bs, &local_err);
+ blk_invalidate_cache(blk, &local_err);
if (local_err) {
error_report_err(local_err);
return -EINVAL;
}
+
+ ret = bdrv_get_info(blk_bs(blk), &bdi);
+ if (ret == 0 && bdi.cluster_size > 0 &&
+ bdi.cluster_size <= BLOCK_SIZE &&
+ BLOCK_SIZE % bdi.cluster_size == 0) {
+ cluster_size = bdi.cluster_size;
+ } else {
+ cluster_size = BLOCK_SIZE;
+ }
}
if (total_sectors - addr < BDRV_SECTORS_PER_DIRTY_CHUNK) {
}
if (flags & BLK_MIG_FLAG_ZERO_BLOCK) {
- ret = bdrv_write_zeroes(bs, addr, nr_sectors,
+ ret = blk_pwrite_zeroes(blk, addr * BDRV_SECTOR_SIZE,
+ nr_sectors * BDRV_SECTOR_SIZE,
BDRV_REQ_MAY_UNMAP);
} else {
+ int i;
+ int64_t cur_addr;
+ uint8_t *cur_buf;
+
buf = g_malloc(BLOCK_SIZE);
qemu_get_buffer(f, buf, BLOCK_SIZE);
- ret = bdrv_write(bs, addr, buf, nr_sectors);
+ for (i = 0; i < BLOCK_SIZE / cluster_size; i++) {
+ cur_addr = addr * BDRV_SECTOR_SIZE + i * cluster_size;
+ cur_buf = buf + i * cluster_size;
+
+ if ((!block_mig_state.zero_blocks ||
+ cluster_size < BLOCK_SIZE) &&
+ buffer_is_zero(cur_buf, cluster_size)) {
+ ret = blk_pwrite_zeroes(blk, cur_addr,
+ cluster_size,
+ BDRV_REQ_MAY_UNMAP);
+ } else {
+ ret = blk_pwrite(blk, cur_addr, cur_buf,
+ cluster_size, 0);
+ }
+ if (ret < 0) {
+ break;
+ }
+ }
g_free(buf);
}
return 0;
}
-static void block_set_params(const MigrationParams *params, void *opaque)
-{
- block_mig_state.blk_enable = params->blk;
- block_mig_state.shared_base = params->shared;
-
- /* shared base means that blk_enable = 1 */
- block_mig_state.blk_enable |= params->shared;
-}
-
static bool block_is_active(void *opaque)
{
- return block_mig_state.blk_enable == 1;
+ return migrate_use_block();
}
static SaveVMHandlers savevm_block_handlers = {
- .set_params = block_set_params,
- .save_live_setup = block_save_setup,
+ .save_setup = block_save_setup,
.save_live_iterate = block_save_iterate,
.save_live_complete_precopy = block_save_complete,
.save_live_pending = block_save_pending,
.load_state = block_load,
- .cleanup = block_migration_cleanup,
+ .save_cleanup = block_migration_cleanup,
.is_active = block_is_active,
};
projects / qemu.git / blobdiff