#include "monitor.h"
#include "block-migration.h"
#include "migration.h"
+#include "blockdev.h"
#include <assert.h>
#define BLOCK_SIZE (BDRV_SECTORS_PER_DIRTY_CHUNK << BDRV_SECTOR_BITS)
int64_t total_sectors;
int64_t dirty;
QSIMPLEQ_ENTRY(BlkMigDevState) entry;
+ unsigned long *aio_bitmap;
} BlkMigDevState;
typedef struct BlkMigBlock {
uint8_t *buf;
BlkMigDevState *bmds;
int64_t sector;
+ int nr_sectors;
struct iovec iov;
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)
+static inline long double compute_read_bwidth(void)
{
- block_mig_state.reads++;
- block_mig_state.total_time += time;
+ assert(block_mig_state.total_time != 0);
+ return (block_mig_state.reads / block_mig_state.total_time) * BLOCK_SIZE;
}
-static inline long double compute_read_bwidth(void)
+static int bmds_aio_inflight(BlkMigDevState *bmds, int64_t sector)
{
- assert(block_mig_state.total_time != 0);
- return (block_mig_state.reads * BLOCK_SIZE)/ block_mig_state.total_time;
+ int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK;
+
+ if ((sector << BDRV_SECTOR_BITS) < bdrv_getlength(bmds->bs)) {
+ return !!(bmds->aio_bitmap[chunk / (sizeof(unsigned long) * 8)] &
+ (1UL << (chunk % (sizeof(unsigned long) * 8))));
+ } else {
+ return 0;
+ }
+}
+
+static void bmds_set_aio_inflight(BlkMigDevState *bmds, int64_t sector_num,
+ int nb_sectors, int set)
+{
+ int64_t start, end;
+ unsigned long val, idx, bit;
+
+ start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK;
+ end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK;
+
+ for (; start <= end; start++) {
+ idx = start / (sizeof(unsigned long) * 8);
+ bit = start % (sizeof(unsigned long) * 8);
+ val = bmds->aio_bitmap[idx];
+ if (set) {
+ val |= 1UL << bit;
+ } else {
+ val &= ~(1UL << bit);
+ }
+ bmds->aio_bitmap[idx] = val;
+ }
+}
+
+static void alloc_aio_bitmap(BlkMigDevState *bmds)
+{
+ 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_SECTORS_PER_DIRTY_CHUNK * 8;
+
+ 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);
block_mig_state.submitted--;
block_mig_state.read_done++;
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_base = blk->buf;
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);
error:
monitor_printf(mon, "Error reading sector %" PRId64 "\n", cur_sector);
- qemu_file_set_error(f);
- qemu_free(blk->buf);
- qemu_free(blk);
+ qemu_file_set_error(f, -EIO);
+ g_free(blk->buf);
+ g_free(blk);
return 0;
}
if (!bdrv_is_read_only(bs)) {
sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
- if (sectors == 0) {
+ if (sectors <= 0) {
return;
}
- bmds = qemu_mallocz(sizeof(BlkMigDevState));
+ bmds = g_malloc0(sizeof(BlkMigDevState));
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);
block_mig_state.total_sector_sum += sectors;
}
}
- progress = completed_sector_sum * 100 / block_mig_state.total_sector_sum;
+ if (block_mig_state.total_sector_sum != 0) {
+ progress = completed_sector_sum * 100 /
+ block_mig_state.total_sector_sum;
+ } else {
+ progress = 100;
+ }
if (progress != block_mig_state.prev_progress) {
block_mig_state.prev_progress = progress;
qemu_put_be64(f, (progress << BDRV_SECTOR_BITS)
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();
+ }
if (bdrv_get_dirty(bmds->bs, sector)) {
if (total_sectors - sector < BDRV_SECTORS_PER_DIRTY_CHUNK) {
} 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;
if (is_async) {
blk->iov.iov_base = blk->buf;
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);
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);
error:
monitor_printf(mon, "Error reading sector %" PRId64 "\n", sector);
- qemu_file_set_error(f);
- qemu_free(blk->buf);
- qemu_free(blk);
+ qemu_file_set_error(f, ret);
+ g_free(blk->buf);
+ g_free(blk);
return 0;
}
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 (block_mig_state.bulk_completed == 1) {
remaining_dirty = get_remaining_dirty();
- if (remaining_dirty == 0) {
- return 1;
- }
+ if (remaining_dirty == 0) {
+ return 1;
+ }
- bwidth = compute_read_bwidth();
+ bwidth = compute_read_bwidth();
- if ((remaining_dirty / bwidth) <=
+ 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;
BlkMigDevState *bmds;
BlkMigBlock *blk;
+ set_dirty_tracking(0);
+
while ((bmds = QSIMPLEQ_FIRST(&block_mig_state.bmds_list)) != NULL) {
QSIMPLEQ_REMOVE_HEAD(&block_mig_state.bmds_list, entry);
- qemu_free(bmds);
+ bdrv_set_in_use(bmds->bs, 0);
+ drive_put_ref(drive_get_by_blockdev(bmds->bs));
+ 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);
}
- set_dirty_tracking(0);
-
monitor_printf(mon, "\n");
}
static int block_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque)
{
+ int ret;
+
DPRINTF("Enter save live stage %d submitted %d transferred %d\n",
stage, block_mig_state.submitted, block_mig_state.transferred);
flush_blks(f);
- if (qemu_file_has_error(f)) {
+ ret = qemu_file_get_error(f);
+ if (ret) {
blk_mig_cleanup(mon);
- return 0;
+ return ret;
}
blk_mig_reset_dirty_cursor();
flush_blks(f);
- if (qemu_file_has_error(f)) {
+ ret = qemu_file_get_error(f);
+ if (ret) {
blk_mig_cleanup(mon);
- return 0;
+ return ret;
}
}
/* report completion */
qemu_put_be64(f, (100 << BDRV_SECTOR_BITS) | BLK_MIG_FLAG_PROGRESS);
- if (qemu_file_has_error(f)) {
- return 0;
+ ret = qemu_file_get_error(f);
+ if (ret) {
+ return ret;
}
monitor_printf(mon, "Block migration completed\n");
int len, flags;
char device_name[256];
int64_t addr;
- BlockDriverState *bs;
+ BlockDriverState *bs, *bs_prev = NULL;
uint8_t *buf;
+ int64_t total_sectors = 0;
+ int nr_sectors;
+ int ret;
do {
addr = qemu_get_be64(f);
return -EINVAL;
}
- buf = qemu_malloc(BLOCK_SIZE);
+ if (bs != bs_prev) {
+ bs_prev = bs;
+ total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
+ if (total_sectors <= 0) {
+ error_report("Error getting length of block device %s",
+ device_name);
+ return -EINVAL;
+ }
+ }
+
+ if (total_sectors - addr < BDRV_SECTORS_PER_DIRTY_CHUNK) {
+ nr_sectors = total_sectors - addr;
+ } else {
+ nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK;
+ }
+
+ buf = g_malloc(BLOCK_SIZE);
qemu_get_buffer(f, buf, BLOCK_SIZE);
- bdrv_write(bs, addr, buf, BDRV_SECTORS_PER_DIRTY_CHUNK);
+ ret = bdrv_write(bs, addr, buf, nr_sectors);
- qemu_free(buf);
+ g_free(buf);
+ if (ret < 0) {
+ return ret;
+ }
} else if (flags & BLK_MIG_FLAG_PROGRESS) {
if (!banner_printed) {
printf("Receiving block device images\n");
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));
QSIMPLEQ_INIT(&block_mig_state.bmds_list);
QSIMPLEQ_INIT(&block_mig_state.blk_list);
- register_savevm_live("block", 0, 1, block_set_params, block_save_live,
- NULL, block_load, &block_mig_state);
+ register_savevm_live(NULL, "block", 0, 1, block_set_params,
+ block_save_live, NULL, block_load, &block_mig_state);
}
projects / qemu.git / blobdiff