* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
+ * Contributions after 2012-01-13 are licensed under the terms of the
+ * GNU GPL, version 2 or (at your option) any later version.
*/
#include "qemu-common.h"
#include "hw/hw.h"
#include "qemu-queue.h"
#include "qemu-timer.h"
-#include "monitor.h"
#include "block-migration.h"
#include "migration.h"
#include "blockdev.h"
QEMUIOVector qiov;
BlockDriverAIOCB *aiocb;
int ret;
- int64_t time;
QSIMPLEQ_ENTRY(BlkMigBlock) entry;
} BlkMigBlock;
int prev_progress;
int bulk_completed;
long double total_time;
+ long double prev_time_offset;
int reads;
} BlkMigState;
return sum << BDRV_SECTOR_BITS;
}
-static inline void add_avg_read_time(int64_t time)
-{
- block_mig_state.reads++;
- block_mig_state.total_time += time;
-}
-
static inline long double compute_read_bwidth(void)
{
assert(block_mig_state.total_time != 0);
- return (block_mig_state.reads * BLOCK_SIZE)/ block_mig_state.total_time;
+ return (block_mig_state.reads / block_mig_state.total_time) * BLOCK_SIZE;
}
static int bmds_aio_inflight(BlkMigDevState *bmds, int64_t sector)
BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1;
bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
- bmds->aio_bitmap = qemu_mallocz(bitmap_size);
+ bmds->aio_bitmap = g_malloc0(bitmap_size);
}
static void blk_mig_read_cb(void *opaque, int ret)
{
+ long double curr_time = qemu_get_clock_ns(rt_clock);
BlkMigBlock *blk = opaque;
blk->ret = ret;
- blk->time = qemu_get_clock_ns(rt_clock) - blk->time;
-
- add_avg_read_time(blk->time);
+ block_mig_state.reads++;
+ block_mig_state.total_time += (curr_time - block_mig_state.prev_time_offset);
+ block_mig_state.prev_time_offset = curr_time;
QSIMPLEQ_INSERT_TAIL(&block_mig_state.blk_list, blk, entry);
bmds_set_aio_inflight(blk->bmds, blk->sector, blk->nr_sectors, 0);
assert(block_mig_state.submitted >= 0);
}
-static int mig_save_device_bulk(Monitor *mon, QEMUFile *f,
- BlkMigDevState *bmds)
+static int mig_save_device_bulk(QEMUFile *f, BlkMigDevState *bmds)
{
int64_t total_sectors = bmds->total_sectors;
int64_t cur_sector = bmds->cur_sector;
nr_sectors = total_sectors - cur_sector;
}
- blk = qemu_malloc(sizeof(BlkMigBlock));
- blk->buf = qemu_malloc(BLOCK_SIZE);
+ blk = g_malloc(sizeof(BlkMigBlock));
+ blk->buf = g_malloc(BLOCK_SIZE);
blk->bmds = bmds;
blk->sector = cur_sector;
blk->nr_sectors = nr_sectors;
blk->iov.iov_len = nr_sectors * BDRV_SECTOR_SIZE;
qemu_iovec_init_external(&blk->qiov, &blk->iov, 1);
- blk->time = qemu_get_clock_ns(rt_clock);
+ if (block_mig_state.submitted == 0) {
+ block_mig_state.prev_time_offset = qemu_get_clock_ns(rt_clock);
+ }
blk->aiocb = bdrv_aio_readv(bs, cur_sector, &blk->qiov,
nr_sectors, blk_mig_read_cb, blk);
- if (!blk->aiocb) {
- goto error;
- }
block_mig_state.submitted++;
bdrv_reset_dirty(bs, cur_sector, nr_sectors);
bmds->cur_sector = cur_sector + nr_sectors;
return (bmds->cur_sector >= total_sectors);
-
-error:
- monitor_printf(mon, "Error reading sector %" PRId64 "\n", cur_sector);
- qemu_file_set_error(f);
- qemu_free(blk->buf);
- qemu_free(blk);
- return 0;
}
static void set_dirty_tracking(int enable)
static void init_blk_migration_it(void *opaque, BlockDriverState *bs)
{
- Monitor *mon = opaque;
BlkMigDevState *bmds;
int64_t sectors;
return;
}
- bmds = qemu_mallocz(sizeof(BlkMigDevState));
+ bmds = g_malloc0(sizeof(BlkMigDevState));
bmds->bs = bs;
bmds->bulk_completed = 0;
bmds->total_sectors = sectors;
block_mig_state.total_sector_sum += sectors;
if (bmds->shared_base) {
- monitor_printf(mon, "Start migration for %s with shared base "
- "image\n",
- bs->device_name);
+ DPRINTF("Start migration for %s with shared base image\n",
+ bs->device_name);
} else {
- monitor_printf(mon, "Start full migration for %s\n",
- bs->device_name);
+ DPRINTF("Start full migration for %s\n", bs->device_name);
}
QSIMPLEQ_INSERT_TAIL(&block_mig_state.bmds_list, bmds, entry);
}
}
-static void init_blk_migration(Monitor *mon, QEMUFile *f)
+static void init_blk_migration(QEMUFile *f)
{
block_mig_state.submitted = 0;
block_mig_state.read_done = 0;
block_mig_state.total_time = 0;
block_mig_state.reads = 0;
- bdrv_iterate(init_blk_migration_it, mon);
+ bdrv_iterate(init_blk_migration_it, NULL);
}
-static int blk_mig_save_bulked_block(Monitor *mon, QEMUFile *f)
+static int blk_mig_save_bulked_block(QEMUFile *f)
{
int64_t completed_sector_sum = 0;
BlkMigDevState *bmds;
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
if (bmds->bulk_completed == 0) {
- if (mig_save_device_bulk(mon, f, bmds) == 1) {
+ if (mig_save_device_bulk(f, bmds) == 1) {
/* completed bulk section for this device */
bmds->bulk_completed = 1;
}
block_mig_state.prev_progress = progress;
qemu_put_be64(f, (progress << BDRV_SECTOR_BITS)
| BLK_MIG_FLAG_PROGRESS);
- monitor_printf(mon, "Completed %d %%\r", progress);
- monitor_flush(mon);
+ DPRINTF("Completed %d %%\r", progress);
}
return ret;
}
}
-static int mig_save_device_dirty(Monitor *mon, QEMUFile *f,
- BlkMigDevState *bmds, int is_async)
+static int mig_save_device_dirty(QEMUFile *f, BlkMigDevState *bmds,
+ int is_async)
{
BlkMigBlock *blk;
int64_t total_sectors = bmds->total_sectors;
int64_t sector;
int nr_sectors;
+ int ret = -EIO;
for (sector = bmds->cur_dirty; sector < bmds->total_sectors;) {
if (bmds_aio_inflight(bmds, sector)) {
- qemu_aio_flush();
+ bdrv_drain_all();
}
if (bdrv_get_dirty(bmds->bs, sector)) {
} else {
nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK;
}
- blk = qemu_malloc(sizeof(BlkMigBlock));
- blk->buf = qemu_malloc(BLOCK_SIZE);
+ blk = g_malloc(sizeof(BlkMigBlock));
+ blk->buf = g_malloc(BLOCK_SIZE);
blk->bmds = bmds;
blk->sector = sector;
blk->nr_sectors = nr_sectors;
blk->iov.iov_len = nr_sectors * BDRV_SECTOR_SIZE;
qemu_iovec_init_external(&blk->qiov, &blk->iov, 1);
- blk->time = qemu_get_clock_ns(rt_clock);
+ if (block_mig_state.submitted == 0) {
+ block_mig_state.prev_time_offset = qemu_get_clock_ns(rt_clock);
+ }
blk->aiocb = bdrv_aio_readv(bmds->bs, sector, &blk->qiov,
nr_sectors, blk_mig_read_cb, blk);
- if (!blk->aiocb) {
- goto error;
- }
block_mig_state.submitted++;
bmds_set_aio_inflight(bmds, sector, nr_sectors, 1);
} else {
- if (bdrv_read(bmds->bs, sector, blk->buf,
- nr_sectors) < 0) {
+ ret = bdrv_read(bmds->bs, sector, blk->buf, nr_sectors);
+ if (ret < 0) {
goto error;
}
blk_send(f, blk);
- qemu_free(blk->buf);
- qemu_free(blk);
+ g_free(blk->buf);
+ g_free(blk);
}
bdrv_reset_dirty(bmds->bs, sector, nr_sectors);
return (bmds->cur_dirty >= bmds->total_sectors);
error:
- monitor_printf(mon, "Error reading sector %" PRId64 "\n", sector);
- qemu_file_set_error(f);
- qemu_free(blk->buf);
- qemu_free(blk);
+ DPRINTF("Error reading sector %" PRId64 "\n", sector);
+ qemu_file_set_error(f, ret);
+ g_free(blk->buf);
+ g_free(blk);
return 0;
}
-static int blk_mig_save_dirty_block(Monitor *mon, QEMUFile *f, int is_async)
+static int blk_mig_save_dirty_block(QEMUFile *f, int is_async)
{
BlkMigDevState *bmds;
int ret = 0;
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
- if (mig_save_device_dirty(mon, f, bmds, is_async) == 0) {
+ if (mig_save_device_dirty(f, bmds, is_async) == 0) {
ret = 1;
break;
}
break;
}
if (blk->ret < 0) {
- qemu_file_set_error(f);
+ qemu_file_set_error(f, blk->ret);
break;
}
blk_send(f, blk);
QSIMPLEQ_REMOVE_HEAD(&block_mig_state.blk_list, entry);
- qemu_free(blk->buf);
- qemu_free(blk);
+ g_free(blk->buf);
+ g_free(blk);
block_mig_state.read_done--;
block_mig_state.transferred++;
if ((remaining_dirty / bwidth) <=
migrate_max_downtime()) {
- /* finish stage2 because we think that we can finish remaing work
+ /* finish stage2 because we think that we can finish remaining work
below max_downtime */
return 1;
return 0;
}
-static void blk_mig_cleanup(Monitor *mon)
+static void blk_mig_cleanup(void)
{
BlkMigDevState *bmds;
BlkMigBlock *blk;
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));
- qemu_free(bmds->aio_bitmap);
- qemu_free(bmds);
+ g_free(bmds->aio_bitmap);
+ g_free(bmds);
}
while ((blk = QSIMPLEQ_FIRST(&block_mig_state.blk_list)) != NULL) {
QSIMPLEQ_REMOVE_HEAD(&block_mig_state.blk_list, entry);
- qemu_free(blk->buf);
- qemu_free(blk);
+ g_free(blk->buf);
+ g_free(blk);
}
+}
- monitor_printf(mon, "\n");
+static void block_migration_cancel(void *opaque)
+{
+ blk_mig_cleanup();
}
-static int block_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque)
+static int block_save_setup(QEMUFile *f, void *opaque)
{
- DPRINTF("Enter save live stage %d submitted %d transferred %d\n",
- stage, block_mig_state.submitted, block_mig_state.transferred);
+ int ret;
- if (stage < 0) {
- blk_mig_cleanup(mon);
- return 0;
- }
+ DPRINTF("Enter save live setup submitted %d transferred %d\n",
+ block_mig_state.submitted, block_mig_state.transferred);
- if (block_mig_state.blk_enable != 1) {
- /* no need to migrate storage */
- qemu_put_be64(f, BLK_MIG_FLAG_EOS);
- return 1;
- }
+ init_blk_migration(f);
- if (stage == 1) {
- init_blk_migration(mon, f);
+ /* start track dirty blocks */
+ set_dirty_tracking(1);
- /* start track dirty blocks */
- set_dirty_tracking(1);
+ flush_blks(f);
+
+ ret = qemu_file_get_error(f);
+ if (ret) {
+ blk_mig_cleanup();
+ return ret;
}
+ blk_mig_reset_dirty_cursor();
+
+ qemu_put_be64(f, BLK_MIG_FLAG_EOS);
+
+ return 0;
+}
+
+static int block_save_iterate(QEMUFile *f, void *opaque)
+{
+ int ret;
+
+ DPRINTF("Enter save live iterate submitted %d transferred %d\n",
+ block_mig_state.submitted, block_mig_state.transferred);
+
flush_blks(f);
- if (qemu_file_has_error(f)) {
- blk_mig_cleanup(mon);
- return 0;
+ ret = qemu_file_get_error(f);
+ if (ret) {
+ blk_mig_cleanup();
+ return ret;
}
blk_mig_reset_dirty_cursor();
- if (stage == 2) {
- /* control the rate of transfer */
- while ((block_mig_state.submitted +
- block_mig_state.read_done) * BLOCK_SIZE <
- qemu_file_get_rate_limit(f)) {
- if (block_mig_state.bulk_completed == 0) {
- /* first finish the bulk phase */
- if (blk_mig_save_bulked_block(mon, f) == 0) {
- /* finished saving bulk on all devices */
- block_mig_state.bulk_completed = 1;
- }
- } else {
- if (blk_mig_save_dirty_block(mon, f, 1) == 0) {
- /* no more dirty blocks */
- break;
- }
+ /* control the rate of transfer */
+ while ((block_mig_state.submitted +
+ block_mig_state.read_done) * BLOCK_SIZE <
+ qemu_file_get_rate_limit(f)) {
+ if (block_mig_state.bulk_completed == 0) {
+ /* first finish the bulk phase */
+ if (blk_mig_save_bulked_block(f) == 0) {
+ /* finished saving bulk on all devices */
+ block_mig_state.bulk_completed = 1;
+ }
+ } else {
+ if (blk_mig_save_dirty_block(f, 1) == 0) {
+ /* no more dirty blocks */
+ break;
}
}
+ }
- flush_blks(f);
+ flush_blks(f);
- if (qemu_file_has_error(f)) {
- blk_mig_cleanup(mon);
- return 0;
- }
+ ret = qemu_file_get_error(f);
+ if (ret) {
+ blk_mig_cleanup();
+ return ret;
}
- if (stage == 3) {
- /* we know for sure that save bulk is completed and
- all async read completed */
- assert(block_mig_state.submitted == 0);
+ qemu_put_be64(f, BLK_MIG_FLAG_EOS);
+
+ return is_stage2_completed();
+}
- while (blk_mig_save_dirty_block(mon, f, 0) != 0);
- blk_mig_cleanup(mon);
+static int block_save_complete(QEMUFile *f, void *opaque)
+{
+ int ret;
- /* report completion */
- qemu_put_be64(f, (100 << BDRV_SECTOR_BITS) | BLK_MIG_FLAG_PROGRESS);
+ DPRINTF("Enter save live complete submitted %d transferred %d\n",
+ block_mig_state.submitted, block_mig_state.transferred);
- if (qemu_file_has_error(f)) {
- return 0;
- }
+ flush_blks(f);
+
+ ret = qemu_file_get_error(f);
+ if (ret) {
+ blk_mig_cleanup();
+ return ret;
+ }
+
+ blk_mig_reset_dirty_cursor();
+
+ /* we know for sure that save bulk is completed and
+ all async read completed */
+ assert(block_mig_state.submitted == 0);
+
+ while (blk_mig_save_dirty_block(f, 0) != 0) {
+ /* Do nothing */
+ }
+ blk_mig_cleanup();
- monitor_printf(mon, "Block migration completed\n");
+ /* report completion */
+ qemu_put_be64(f, (100 << BDRV_SECTOR_BITS) | BLK_MIG_FLAG_PROGRESS);
+
+ ret = qemu_file_get_error(f);
+ if (ret) {
+ return ret;
}
+ DPRINTF("Block migration completed\n");
+
qemu_put_be64(f, BLK_MIG_FLAG_EOS);
- return ((stage == 2) && is_stage2_completed());
+ return 0;
}
static int block_load(QEMUFile *f, void *opaque, int version_id)
uint8_t *buf;
int64_t total_sectors = 0;
int nr_sectors;
+ int ret;
do {
addr = qemu_get_be64(f);
addr >>= BDRV_SECTOR_BITS;
if (flags & BLK_MIG_FLAG_DEVICE_BLOCK) {
- int ret;
/* get device name */
len = qemu_get_byte(f);
qemu_get_buffer(f, (uint8_t *)device_name, len);
bs_prev = bs;
total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
if (total_sectors <= 0) {
- error_report("Error getting length of block device %s\n",
+ error_report("Error getting length of block device %s",
device_name);
return -EINVAL;
}
nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK;
}
- buf = qemu_malloc(BLOCK_SIZE);
+ buf = g_malloc(BLOCK_SIZE);
qemu_get_buffer(f, buf, BLOCK_SIZE);
ret = bdrv_write(bs, addr, buf, nr_sectors);
- qemu_free(buf);
+ g_free(buf);
if (ret < 0) {
return ret;
}
fprintf(stderr, "Unknown flags\n");
return -EINVAL;
}
- if (qemu_file_has_error(f)) {
- return -EIO;
+ ret = qemu_file_get_error(f);
+ if (ret != 0) {
+ return ret;
}
} while (!(flags & BLK_MIG_FLAG_EOS));
return 0;
}
-static void block_set_params(int blk_enable, int shared_base, void *opaque)
+static void block_set_params(const MigrationParams *params, void *opaque)
{
- block_mig_state.blk_enable = blk_enable;
- block_mig_state.shared_base = shared_base;
+ 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 |= shared_base;
+ block_mig_state.blk_enable |= params->shared;
}
+static bool block_is_active(void *opaque)
+{
+ return block_mig_state.blk_enable == 1;
+}
+
+SaveVMHandlers savevm_block_handlers = {
+ .set_params = block_set_params,
+ .save_live_setup = block_save_setup,
+ .save_live_iterate = block_save_iterate,
+ .save_live_complete = block_save_complete,
+ .load_state = block_load,
+ .cancel = block_migration_cancel,
+ .is_active = block_is_active,
+};
+
void blk_mig_init(void)
{
QSIMPLEQ_INIT(&block_mig_state.bmds_list);
QSIMPLEQ_INIT(&block_mig_state.blk_list);
- register_savevm_live(NULL, "block", 0, 1, block_set_params,
- block_save_live, NULL, block_load, &block_mig_state);
+ register_savevm_live(NULL, "block", 0, 1, &savevm_block_handlers,
+ &block_mig_state);
}
projects / sdk / emulator / qemu.git / blobdiff