*/
#include "qemu-common.h"
-#include "block/block_int.h"
+#include "block/block.h"
+#include "qemu/error-report.h"
+#include "qemu/main-loop.h"
#include "hw/hw.h"
#include "qemu/queue.h"
#include "qemu/timer.h"
#define BLK_MIG_FLAG_DEVICE_BLOCK 0x01
#define BLK_MIG_FLAG_EOS 0x02
#define BLK_MIG_FLAG_PROGRESS 0x04
+#define BLK_MIG_FLAG_ZERO_BLOCK 0x08
#define MAX_IS_ALLOCATED_SEARCH 65536
/* Protected by block migration lock. */
unsigned long *aio_bitmap;
int64_t completed_sectors;
+ BdrvDirtyBitmap *dirty_bitmap;
+ Error *blocker;
} BlkMigDevState;
typedef struct BlkMigBlock {
int nr_sectors;
struct iovec iov;
QEMUIOVector qiov;
- BlockDriverAIOCB *aiocb;
+ BlockAIOCB *aiocb;
/* Protected by block migration lock. */
int ret;
int shared_base;
QSIMPLEQ_HEAD(bmds_list, BlkMigDevState) bmds_list;
int64_t total_sector_sum;
+ bool zero_blocks;
/* Protected by lock. */
QSIMPLEQ_HEAD(blk_list, BlkMigBlock) blk_list;
static void blk_send(QEMUFile *f, BlkMigBlock * blk)
{
int len;
+ uint64_t flags = BLK_MIG_FLAG_DEVICE_BLOCK;
+
+ if (block_mig_state.zero_blocks &&
+ buffer_is_zero(blk->buf, BLOCK_SIZE)) {
+ flags |= BLK_MIG_FLAG_ZERO_BLOCK;
+ }
/* sector number and flags */
qemu_put_be64(f, (blk->sector << BDRV_SECTOR_BITS)
- | BLK_MIG_FLAG_DEVICE_BLOCK);
+ | flags);
/* device name */
- len = strlen(blk->bmds->bs->device_name);
+ len = strlen(bdrv_get_device_name(blk->bmds->bs));
qemu_put_byte(f, len);
- qemu_put_buffer(f, (uint8_t *)blk->bmds->bs->device_name, len);
+ qemu_put_buffer(f, (uint8_t *)bdrv_get_device_name(blk->bmds->bs), 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.
+ * thus if we queue zero blocks we slow down the migration */
+ if (flags & BLK_MIG_FLAG_ZERO_BLOCK) {
+ qemu_fflush(f);
+ return;
+ }
qemu_put_buffer(f, blk->buf, BLOCK_SIZE);
}
{
int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK;
- if ((sector << BDRV_SECTOR_BITS) < bdrv_getlength(bmds->bs)) {
+ if (sector < bdrv_nb_sectors(bmds->bs)) {
return !!(bmds->aio_bitmap[chunk / (sizeof(unsigned long) * 8)] &
(1UL << (chunk % (sizeof(unsigned long) * 8))));
} else {
BlockDriverState *bs = bmds->bs;
int64_t bitmap_size;
- bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) +
- BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1;
+ bitmap_size = bdrv_nb_sectors(bs) + BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1;
bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
bmds->aio_bitmap = g_malloc0(bitmap_size);
nr_sectors = total_sectors - cur_sector;
}
- blk = g_malloc(sizeof(BlkMigBlock));
+ blk = g_new(BlkMigBlock, 1);
blk->buf = g_malloc(BLOCK_SIZE);
blk->bmds = bmds;
blk->sector = cur_sector;
/* Called with iothread lock taken. */
-static void set_dirty_tracking(int enable)
+static int set_dirty_tracking(void)
{
BlkMigDevState *bmds;
+ int ret;
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
- bdrv_set_dirty_tracking(bmds->bs, enable ? BLOCK_SIZE : 0);
+ bmds->dirty_bitmap = bdrv_create_dirty_bitmap(bmds->bs, BLOCK_SIZE,
+ NULL);
+ if (!bmds->dirty_bitmap) {
+ ret = -errno;
+ goto fail;
+ }
}
+ return 0;
+
+fail:
+ QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
+ if (bmds->dirty_bitmap) {
+ bdrv_release_dirty_bitmap(bmds->bs, bmds->dirty_bitmap);
+ }
+ }
+ return ret;
}
-static void init_blk_migration_it(void *opaque, BlockDriverState *bs)
+static void unset_dirty_tracking(void)
{
BlkMigDevState *bmds;
+
+ QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
+ bdrv_release_dirty_bitmap(bmds->bs, bmds->dirty_bitmap);
+ }
+}
+
+static void init_blk_migration(QEMUFile *f)
+{
+ BlockDriverState *bs;
+ BlkMigDevState *bmds;
int64_t sectors;
- if (!bdrv_is_read_only(bs)) {
- sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
+ block_mig_state.submitted = 0;
+ block_mig_state.read_done = 0;
+ block_mig_state.transferred = 0;
+ block_mig_state.total_sector_sum = 0;
+ block_mig_state.prev_progress = -1;
+ block_mig_state.bulk_completed = 0;
+ block_mig_state.zero_blocks = migrate_zero_blocks();
+
+ for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
+ if (bdrv_is_read_only(bs)) {
+ continue;
+ }
+
+ sectors = bdrv_nb_sectors(bs);
if (sectors <= 0) {
return;
}
- bmds = g_malloc0(sizeof(BlkMigDevState));
+ bmds = g_new0(BlkMigDevState, 1);
bmds->bs = 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);
- drive_get_ref(drive_get_by_blockdev(bs));
- bdrv_set_in_use(bs, 1);
+ error_setg(&bmds->blocker, "block device is in use by migration");
+ bdrv_op_block_all(bs, bmds->blocker);
+ bdrv_ref(bs);
block_mig_state.total_sector_sum += sectors;
if (bmds->shared_base) {
DPRINTF("Start migration for %s with shared base image\n",
- bs->device_name);
+ bdrv_get_device_name(bs));
} else {
- DPRINTF("Start full migration for %s\n", bs->device_name);
+ DPRINTF("Start full migration for %s\n", bdrv_get_device_name(bs));
}
QSIMPLEQ_INSERT_TAIL(&block_mig_state.bmds_list, bmds, entry);
}
}
-static void init_blk_migration(QEMUFile *f)
-{
- block_mig_state.submitted = 0;
- block_mig_state.read_done = 0;
- block_mig_state.transferred = 0;
- block_mig_state.total_sector_sum = 0;
- block_mig_state.prev_progress = -1;
- block_mig_state.bulk_completed = 0;
-
- bdrv_iterate(init_blk_migration_it, NULL);
-}
-
/* Called with no lock taken. */
static int blk_mig_save_bulked_block(QEMUFile *f)
} else {
blk_mig_unlock();
}
- if (bdrv_get_dirty(bmds->bs, sector)) {
+ if (bdrv_get_dirty(bmds->bs, bmds->dirty_bitmap, sector)) {
if (total_sectors - sector < BDRV_SECTORS_PER_DIRTY_CHUNK) {
nr_sectors = total_sectors - sector;
} else {
nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK;
}
- blk = g_malloc(sizeof(BlkMigBlock));
+ blk = g_new(BlkMigBlock, 1);
blk->buf = g_malloc(BLOCK_SIZE);
blk->bmds = bmds;
blk->sector = sector;
int64_t dirty = 0;
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
- dirty += bdrv_get_dirty_count(bmds->bs);
+ dirty += bdrv_get_dirty_count(bmds->bs, bmds->dirty_bitmap);
}
return dirty << BDRV_SECTOR_BITS;
bdrv_drain_all();
- set_dirty_tracking(0);
+ unset_dirty_tracking();
blk_mig_lock();
while ((bmds = QSIMPLEQ_FIRST(&block_mig_state.bmds_list)) != NULL) {
QSIMPLEQ_REMOVE_HEAD(&block_mig_state.bmds_list, entry);
- bdrv_set_in_use(bmds->bs, 0);
- drive_put_ref(drive_get_by_blockdev(bmds->bs));
+ bdrv_op_unblock_all(bmds->bs, bmds->blocker);
+ error_free(bmds->blocker);
+ bdrv_unref(bmds->bs);
g_free(bmds->aio_bitmap);
g_free(bmds);
}
init_blk_migration(f);
/* start track dirty blocks */
- set_dirty_tracking(1);
+ ret = set_dirty_tracking();
+
+ if (ret) {
+ qemu_mutex_unlock_iothread();
+ return ret;
+ }
+
qemu_mutex_unlock_iothread();
ret = flush_blks(f);
if (bs != bs_prev) {
bs_prev = bs;
- total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
+ total_sectors = bdrv_nb_sectors(bs);
if (total_sectors <= 0) {
error_report("Error getting length of block device %s",
device_name);
nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK;
}
- buf = g_malloc(BLOCK_SIZE);
-
- qemu_get_buffer(f, buf, BLOCK_SIZE);
- ret = bdrv_write(bs, addr, buf, nr_sectors);
+ if (flags & BLK_MIG_FLAG_ZERO_BLOCK) {
+ ret = bdrv_write_zeroes(bs, addr, nr_sectors,
+ BDRV_REQ_MAY_UNMAP);
+ } else {
+ buf = g_malloc(BLOCK_SIZE);
+ qemu_get_buffer(f, buf, BLOCK_SIZE);
+ ret = bdrv_write(bs, addr, buf, nr_sectors);
+ g_free(buf);
+ }
- g_free(buf);
if (ret < 0) {
return ret;
}
return block_mig_state.blk_enable == 1;
}
-SaveVMHandlers savevm_block_handlers = {
+static SaveVMHandlers savevm_block_handlers = {
.set_params = block_set_params,
.save_live_setup = block_save_setup,
.save_live_iterate = block_save_iterate,
projects / mirror_qemu.git / blobdiff