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/*
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* QEMU live block migration
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*
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* Copyright IBM, Corp. 2009
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*
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* Authors:
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* Liran Schour <lirans@il.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include "qemu-common.h" |
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#include "block_int.h" |
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#include "hw/hw.h" |
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#include "qemu-queue.h" |
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#include "qemu-timer.h" |
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#include "monitor.h" |
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#include "block-migration.h" |
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#include "migration.h" |
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#include <assert.h> |
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#define BLOCK_SIZE (BDRV_SECTORS_PER_DIRTY_CHUNK << BDRV_SECTOR_BITS)
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|
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#define BLK_MIG_FLAG_DEVICE_BLOCK 0x01 |
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#define BLK_MIG_FLAG_EOS 0x02 |
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#define BLK_MIG_FLAG_PROGRESS 0x04 |
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|
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#define MAX_IS_ALLOCATED_SEARCH 65536 |
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//#define DEBUG_BLK_MIGRATION
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#ifdef DEBUG_BLK_MIGRATION
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#define DPRINTF(fmt, ...) \
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do { printf("blk_migration: " fmt, ## __VA_ARGS__); } while (0) |
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#else
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#define DPRINTF(fmt, ...) \
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do { } while (0) |
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#endif
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typedef struct BlkMigDevState { |
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BlockDriverState *bs; |
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int bulk_completed;
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int shared_base;
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int64_t cur_sector; |
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int64_t cur_dirty; |
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int64_t completed_sectors; |
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int64_t total_sectors; |
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int64_t dirty; |
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QSIMPLEQ_ENTRY(BlkMigDevState) entry; |
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} BlkMigDevState; |
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|
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typedef struct BlkMigBlock { |
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uint8_t *buf; |
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BlkMigDevState *bmds; |
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int64_t sector; |
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struct iovec iov;
|
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QEMUIOVector qiov; |
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BlockDriverAIOCB *aiocb; |
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int ret;
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int64_t time; |
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QSIMPLEQ_ENTRY(BlkMigBlock) entry; |
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} BlkMigBlock; |
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typedef struct BlkMigState { |
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int blk_enable;
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int shared_base;
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QSIMPLEQ_HEAD(bmds_list, BlkMigDevState) bmds_list; |
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QSIMPLEQ_HEAD(blk_list, BlkMigBlock) blk_list; |
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int submitted;
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int read_done;
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int transferred;
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int64_t total_sector_sum; |
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int prev_progress;
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int bulk_completed;
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long double total_time; |
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int reads;
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} BlkMigState; |
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static BlkMigState block_mig_state;
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|
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static void blk_send(QEMUFile *f, BlkMigBlock * blk) |
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{ |
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int len;
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|
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/* sector number and flags */
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qemu_put_be64(f, (blk->sector << BDRV_SECTOR_BITS) |
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| BLK_MIG_FLAG_DEVICE_BLOCK); |
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|
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/* device name */
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len = strlen(blk->bmds->bs->device_name); |
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qemu_put_byte(f, len); |
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qemu_put_buffer(f, (uint8_t *)blk->bmds->bs->device_name, len); |
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qemu_put_buffer(f, blk->buf, BLOCK_SIZE); |
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} |
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int blk_mig_active(void) |
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{ |
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return !QSIMPLEQ_EMPTY(&block_mig_state.bmds_list);
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} |
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uint64_t blk_mig_bytes_transferred(void)
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{ |
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BlkMigDevState *bmds; |
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uint64_t sum = 0;
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|
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QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
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sum += bmds->completed_sectors; |
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} |
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return sum << BDRV_SECTOR_BITS;
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} |
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uint64_t blk_mig_bytes_remaining(void)
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{ |
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return blk_mig_bytes_total() - blk_mig_bytes_transferred();
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} |
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uint64_t blk_mig_bytes_total(void)
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{ |
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BlkMigDevState *bmds; |
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uint64_t sum = 0;
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QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
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sum += bmds->total_sectors; |
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} |
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return sum << BDRV_SECTOR_BITS;
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} |
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static inline void add_avg_read_time(int64_t time) |
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{ |
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block_mig_state.reads++; |
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block_mig_state.total_time += time; |
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} |
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static inline long double compute_read_bwidth(void) |
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{ |
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assert(block_mig_state.total_time != 0);
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return (block_mig_state.reads * BLOCK_SIZE)/ block_mig_state.total_time;
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} |
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static void blk_mig_read_cb(void *opaque, int ret) |
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{ |
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BlkMigBlock *blk = opaque; |
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blk->ret = ret; |
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blk->time = qemu_get_clock_ns(rt_clock) - blk->time; |
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add_avg_read_time(blk->time); |
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QSIMPLEQ_INSERT_TAIL(&block_mig_state.blk_list, blk, entry); |
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block_mig_state.submitted--; |
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block_mig_state.read_done++; |
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assert(block_mig_state.submitted >= 0);
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} |
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static int mig_save_device_bulk(Monitor *mon, QEMUFile *f, |
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BlkMigDevState *bmds) |
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{ |
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int64_t total_sectors = bmds->total_sectors; |
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int64_t cur_sector = bmds->cur_sector; |
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BlockDriverState *bs = bmds->bs; |
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BlkMigBlock *blk; |
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int nr_sectors;
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if (bmds->shared_base) {
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while (cur_sector < total_sectors &&
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!bdrv_is_allocated(bs, cur_sector, MAX_IS_ALLOCATED_SEARCH, |
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&nr_sectors)) { |
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cur_sector += nr_sectors; |
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} |
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} |
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if (cur_sector >= total_sectors) {
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bmds->cur_sector = bmds->completed_sectors = total_sectors; |
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return 1; |
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} |
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bmds->completed_sectors = cur_sector; |
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cur_sector &= ~((int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK - 1);
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/* we are going to transfer a full block even if it is not allocated */
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nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK; |
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if (total_sectors - cur_sector < BDRV_SECTORS_PER_DIRTY_CHUNK) {
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nr_sectors = total_sectors - cur_sector; |
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} |
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blk = qemu_malloc(sizeof(BlkMigBlock));
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blk->buf = qemu_malloc(BLOCK_SIZE); |
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blk->bmds = bmds; |
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blk->sector = cur_sector; |
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blk->iov.iov_base = blk->buf; |
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blk->iov.iov_len = nr_sectors * BDRV_SECTOR_SIZE; |
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qemu_iovec_init_external(&blk->qiov, &blk->iov, 1);
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blk->time = qemu_get_clock_ns(rt_clock); |
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blk->aiocb = bdrv_aio_readv(bs, cur_sector, &blk->qiov, |
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nr_sectors, blk_mig_read_cb, blk); |
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if (!blk->aiocb) {
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goto error;
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} |
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block_mig_state.submitted++; |
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bdrv_reset_dirty(bs, cur_sector, nr_sectors); |
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bmds->cur_sector = cur_sector + nr_sectors; |
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return (bmds->cur_sector >= total_sectors);
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error:
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monitor_printf(mon, "Error reading sector %" PRId64 "\n", cur_sector); |
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qemu_file_set_error(f); |
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qemu_free(blk->buf); |
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qemu_free(blk); |
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return 0; |
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} |
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static void set_dirty_tracking(int enable) |
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{ |
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BlkMigDevState *bmds; |
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QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
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bdrv_set_dirty_tracking(bmds->bs, enable); |
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} |
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} |
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static void init_blk_migration(Monitor *mon, QEMUFile *f) |
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{ |
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BlkMigDevState *bmds; |
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BlockDriverState *bs; |
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int64_t sectors; |
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block_mig_state.submitted = 0;
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block_mig_state.read_done = 0;
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block_mig_state.transferred = 0;
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block_mig_state.total_sector_sum = 0;
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block_mig_state.prev_progress = -1;
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block_mig_state.bulk_completed = 0;
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block_mig_state.total_time = 0;
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block_mig_state.reads = 0;
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for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
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if (bs->type == BDRV_TYPE_HD) {
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sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
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if (sectors == 0) { |
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continue;
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} |
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bmds = qemu_mallocz(sizeof(BlkMigDevState));
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bmds->bs = bs; |
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bmds->bulk_completed = 0;
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bmds->total_sectors = sectors; |
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bmds->completed_sectors = 0;
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bmds->shared_base = block_mig_state.shared_base; |
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block_mig_state.total_sector_sum += sectors; |
263 |
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if (bmds->shared_base) {
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monitor_printf(mon, "Start migration for %s with shared base "
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"image\n",
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bs->device_name); |
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} else {
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monitor_printf(mon, "Start full migration for %s\n",
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bs->device_name); |
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} |
272 |
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QSIMPLEQ_INSERT_TAIL(&block_mig_state.bmds_list, bmds, entry); |
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} |
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} |
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} |
277 |
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static int blk_mig_save_bulked_block(Monitor *mon, QEMUFile *f) |
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{ |
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int64_t completed_sector_sum = 0;
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BlkMigDevState *bmds; |
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int progress;
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int ret = 0; |
284 |
|
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QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
286 |
if (bmds->bulk_completed == 0) { |
287 |
if (mig_save_device_bulk(mon, f, bmds) == 1) { |
288 |
/* completed bulk section for this device */
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bmds->bulk_completed = 1;
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} |
291 |
completed_sector_sum += bmds->completed_sectors; |
292 |
ret = 1;
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break;
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294 |
} else {
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completed_sector_sum += bmds->completed_sectors; |
296 |
} |
297 |
} |
298 |
|
299 |
progress = completed_sector_sum * 100 / block_mig_state.total_sector_sum;
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if (progress != block_mig_state.prev_progress) {
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301 |
block_mig_state.prev_progress = progress; |
302 |
qemu_put_be64(f, (progress << BDRV_SECTOR_BITS) |
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| BLK_MIG_FLAG_PROGRESS); |
304 |
monitor_printf(mon, "Completed %d %%\r", progress);
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monitor_flush(mon); |
306 |
} |
307 |
|
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return ret;
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} |
310 |
|
311 |
static void blk_mig_reset_dirty_cursor(void) |
312 |
{ |
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BlkMigDevState *bmds; |
314 |
|
315 |
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
316 |
bmds->cur_dirty = 0;
|
317 |
} |
318 |
} |
319 |
|
320 |
static int mig_save_device_dirty(Monitor *mon, QEMUFile *f, |
321 |
BlkMigDevState *bmds, int is_async)
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322 |
{ |
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BlkMigBlock *blk; |
324 |
int64_t total_sectors = bmds->total_sectors; |
325 |
int64_t sector; |
326 |
int nr_sectors;
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327 |
|
328 |
for (sector = bmds->cur_dirty; sector < bmds->total_sectors;) {
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329 |
if (bdrv_get_dirty(bmds->bs, sector)) {
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330 |
|
331 |
if (total_sectors - sector < BDRV_SECTORS_PER_DIRTY_CHUNK) {
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332 |
nr_sectors = total_sectors - sector; |
333 |
} else {
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334 |
nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK; |
335 |
} |
336 |
blk = qemu_malloc(sizeof(BlkMigBlock));
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337 |
blk->buf = qemu_malloc(BLOCK_SIZE); |
338 |
blk->bmds = bmds; |
339 |
blk->sector = sector; |
340 |
|
341 |
if (is_async) {
|
342 |
blk->iov.iov_base = blk->buf; |
343 |
blk->iov.iov_len = nr_sectors * BDRV_SECTOR_SIZE; |
344 |
qemu_iovec_init_external(&blk->qiov, &blk->iov, 1);
|
345 |
|
346 |
blk->time = qemu_get_clock_ns(rt_clock); |
347 |
|
348 |
blk->aiocb = bdrv_aio_readv(bmds->bs, sector, &blk->qiov, |
349 |
nr_sectors, blk_mig_read_cb, blk); |
350 |
if (!blk->aiocb) {
|
351 |
goto error;
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352 |
} |
353 |
block_mig_state.submitted++; |
354 |
} else {
|
355 |
if (bdrv_read(bmds->bs, sector, blk->buf,
|
356 |
nr_sectors) < 0) {
|
357 |
goto error;
|
358 |
} |
359 |
blk_send(f, blk); |
360 |
|
361 |
qemu_free(blk->buf); |
362 |
qemu_free(blk); |
363 |
} |
364 |
|
365 |
bdrv_reset_dirty(bmds->bs, sector, nr_sectors); |
366 |
break;
|
367 |
} |
368 |
sector += BDRV_SECTORS_PER_DIRTY_CHUNK; |
369 |
bmds->cur_dirty = sector; |
370 |
} |
371 |
|
372 |
return (bmds->cur_dirty >= bmds->total_sectors);
|
373 |
|
374 |
error:
|
375 |
monitor_printf(mon, "Error reading sector %" PRId64 "\n", sector); |
376 |
qemu_file_set_error(f); |
377 |
qemu_free(blk->buf); |
378 |
qemu_free(blk); |
379 |
return 0; |
380 |
} |
381 |
|
382 |
static int blk_mig_save_dirty_block(Monitor *mon, QEMUFile *f, int is_async) |
383 |
{ |
384 |
BlkMigDevState *bmds; |
385 |
int ret = 0; |
386 |
|
387 |
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
388 |
if (mig_save_device_dirty(mon, f, bmds, is_async) == 0) { |
389 |
ret = 1;
|
390 |
break;
|
391 |
} |
392 |
} |
393 |
|
394 |
return ret;
|
395 |
} |
396 |
|
397 |
static void flush_blks(QEMUFile* f) |
398 |
{ |
399 |
BlkMigBlock *blk; |
400 |
|
401 |
DPRINTF("%s Enter submitted %d read_done %d transferred %d\n",
|
402 |
__FUNCTION__, block_mig_state.submitted, block_mig_state.read_done, |
403 |
block_mig_state.transferred); |
404 |
|
405 |
while ((blk = QSIMPLEQ_FIRST(&block_mig_state.blk_list)) != NULL) { |
406 |
if (qemu_file_rate_limit(f)) {
|
407 |
break;
|
408 |
} |
409 |
if (blk->ret < 0) { |
410 |
qemu_file_set_error(f); |
411 |
break;
|
412 |
} |
413 |
blk_send(f, blk); |
414 |
|
415 |
QSIMPLEQ_REMOVE_HEAD(&block_mig_state.blk_list, entry); |
416 |
qemu_free(blk->buf); |
417 |
qemu_free(blk); |
418 |
|
419 |
block_mig_state.read_done--; |
420 |
block_mig_state.transferred++; |
421 |
assert(block_mig_state.read_done >= 0);
|
422 |
} |
423 |
|
424 |
DPRINTF("%s Exit submitted %d read_done %d transferred %d\n", __FUNCTION__,
|
425 |
block_mig_state.submitted, block_mig_state.read_done, |
426 |
block_mig_state.transferred); |
427 |
} |
428 |
|
429 |
static int64_t get_remaining_dirty(void) |
430 |
{ |
431 |
BlkMigDevState *bmds; |
432 |
int64_t dirty = 0;
|
433 |
|
434 |
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
435 |
dirty += bdrv_get_dirty_count(bmds->bs); |
436 |
} |
437 |
|
438 |
return dirty * BLOCK_SIZE;
|
439 |
} |
440 |
|
441 |
static int is_stage2_completed(void) |
442 |
{ |
443 |
int64_t remaining_dirty; |
444 |
long double bwidth; |
445 |
|
446 |
if (block_mig_state.bulk_completed == 1) { |
447 |
|
448 |
remaining_dirty = get_remaining_dirty(); |
449 |
if (remaining_dirty == 0) { |
450 |
return 1; |
451 |
} |
452 |
|
453 |
bwidth = compute_read_bwidth(); |
454 |
|
455 |
if ((remaining_dirty / bwidth) <=
|
456 |
migrate_max_downtime()) { |
457 |
/* finish stage2 because we think that we can finish remaing work
|
458 |
below max_downtime */
|
459 |
|
460 |
return 1; |
461 |
} |
462 |
} |
463 |
|
464 |
return 0; |
465 |
} |
466 |
|
467 |
static void blk_mig_cleanup(Monitor *mon) |
468 |
{ |
469 |
BlkMigDevState *bmds; |
470 |
BlkMigBlock *blk; |
471 |
|
472 |
while ((bmds = QSIMPLEQ_FIRST(&block_mig_state.bmds_list)) != NULL) { |
473 |
QSIMPLEQ_REMOVE_HEAD(&block_mig_state.bmds_list, entry); |
474 |
qemu_free(bmds); |
475 |
} |
476 |
|
477 |
while ((blk = QSIMPLEQ_FIRST(&block_mig_state.blk_list)) != NULL) { |
478 |
QSIMPLEQ_REMOVE_HEAD(&block_mig_state.blk_list, entry); |
479 |
qemu_free(blk->buf); |
480 |
qemu_free(blk); |
481 |
} |
482 |
|
483 |
set_dirty_tracking(0);
|
484 |
|
485 |
monitor_printf(mon, "\n");
|
486 |
} |
487 |
|
488 |
static int block_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque) |
489 |
{ |
490 |
DPRINTF("Enter save live stage %d submitted %d transferred %d\n",
|
491 |
stage, block_mig_state.submitted, block_mig_state.transferred); |
492 |
|
493 |
if (stage < 0) { |
494 |
blk_mig_cleanup(mon); |
495 |
return 0; |
496 |
} |
497 |
|
498 |
if (block_mig_state.blk_enable != 1) { |
499 |
/* no need to migrate storage */
|
500 |
qemu_put_be64(f, BLK_MIG_FLAG_EOS); |
501 |
return 1; |
502 |
} |
503 |
|
504 |
if (stage == 1) { |
505 |
init_blk_migration(mon, f); |
506 |
|
507 |
/* start track dirty blocks */
|
508 |
set_dirty_tracking(1);
|
509 |
} |
510 |
|
511 |
flush_blks(f); |
512 |
|
513 |
if (qemu_file_has_error(f)) {
|
514 |
blk_mig_cleanup(mon); |
515 |
return 0; |
516 |
} |
517 |
|
518 |
blk_mig_reset_dirty_cursor(); |
519 |
|
520 |
if (stage == 2) { |
521 |
/* control the rate of transfer */
|
522 |
while ((block_mig_state.submitted +
|
523 |
block_mig_state.read_done) * BLOCK_SIZE < |
524 |
qemu_file_get_rate_limit(f)) { |
525 |
if (block_mig_state.bulk_completed == 0) { |
526 |
/* first finish the bulk phase */
|
527 |
if (blk_mig_save_bulked_block(mon, f) == 0) { |
528 |
/* finished saving bulk on all devices */
|
529 |
block_mig_state.bulk_completed = 1;
|
530 |
} |
531 |
} else {
|
532 |
if (blk_mig_save_dirty_block(mon, f, 1) == 0) { |
533 |
/* no more dirty blocks */
|
534 |
break;
|
535 |
} |
536 |
} |
537 |
} |
538 |
|
539 |
flush_blks(f); |
540 |
|
541 |
if (qemu_file_has_error(f)) {
|
542 |
blk_mig_cleanup(mon); |
543 |
return 0; |
544 |
} |
545 |
} |
546 |
|
547 |
if (stage == 3) { |
548 |
/* we know for sure that save bulk is completed and
|
549 |
all async read completed */
|
550 |
assert(block_mig_state.submitted == 0);
|
551 |
|
552 |
while (blk_mig_save_dirty_block(mon, f, 0) != 0); |
553 |
blk_mig_cleanup(mon); |
554 |
|
555 |
/* report completion */
|
556 |
qemu_put_be64(f, (100 << BDRV_SECTOR_BITS) | BLK_MIG_FLAG_PROGRESS);
|
557 |
|
558 |
if (qemu_file_has_error(f)) {
|
559 |
return 0; |
560 |
} |
561 |
|
562 |
monitor_printf(mon, "Block migration completed\n");
|
563 |
} |
564 |
|
565 |
qemu_put_be64(f, BLK_MIG_FLAG_EOS); |
566 |
|
567 |
return ((stage == 2) && is_stage2_completed()); |
568 |
} |
569 |
|
570 |
static int block_load(QEMUFile *f, void *opaque, int version_id) |
571 |
{ |
572 |
static int banner_printed; |
573 |
int len, flags;
|
574 |
char device_name[256]; |
575 |
int64_t addr; |
576 |
BlockDriverState *bs; |
577 |
uint8_t *buf; |
578 |
|
579 |
do {
|
580 |
addr = qemu_get_be64(f); |
581 |
|
582 |
flags = addr & ~BDRV_SECTOR_MASK; |
583 |
addr >>= BDRV_SECTOR_BITS; |
584 |
|
585 |
if (flags & BLK_MIG_FLAG_DEVICE_BLOCK) {
|
586 |
/* get device name */
|
587 |
len = qemu_get_byte(f); |
588 |
qemu_get_buffer(f, (uint8_t *)device_name, len); |
589 |
device_name[len] = '\0';
|
590 |
|
591 |
bs = bdrv_find(device_name); |
592 |
if (!bs) {
|
593 |
fprintf(stderr, "Error unknown block device %s\n",
|
594 |
device_name); |
595 |
return -EINVAL;
|
596 |
} |
597 |
|
598 |
buf = qemu_malloc(BLOCK_SIZE); |
599 |
|
600 |
qemu_get_buffer(f, buf, BLOCK_SIZE); |
601 |
bdrv_write(bs, addr, buf, BDRV_SECTORS_PER_DIRTY_CHUNK); |
602 |
|
603 |
qemu_free(buf); |
604 |
} else if (flags & BLK_MIG_FLAG_PROGRESS) { |
605 |
if (!banner_printed) {
|
606 |
printf("Receiving block device images\n");
|
607 |
banner_printed = 1;
|
608 |
} |
609 |
printf("Completed %d %%%c", (int)addr, |
610 |
(addr == 100) ? '\n' : '\r'); |
611 |
fflush(stdout); |
612 |
} else if (!(flags & BLK_MIG_FLAG_EOS)) { |
613 |
fprintf(stderr, "Unknown flags\n");
|
614 |
return -EINVAL;
|
615 |
} |
616 |
if (qemu_file_has_error(f)) {
|
617 |
return -EIO;
|
618 |
} |
619 |
} while (!(flags & BLK_MIG_FLAG_EOS));
|
620 |
|
621 |
return 0; |
622 |
} |
623 |
|
624 |
static void block_set_params(int blk_enable, int shared_base, void *opaque) |
625 |
{ |
626 |
block_mig_state.blk_enable = blk_enable; |
627 |
block_mig_state.shared_base = shared_base; |
628 |
|
629 |
/* shared base means that blk_enable = 1 */
|
630 |
block_mig_state.blk_enable |= shared_base; |
631 |
} |
632 |
|
633 |
void blk_mig_init(void) |
634 |
{ |
635 |
QSIMPLEQ_INIT(&block_mig_state.bmds_list); |
636 |
QSIMPLEQ_INIT(&block_mig_state.blk_list); |
637 |
|
638 |
register_savevm_live("block", 0, 1, block_set_params, block_save_live, |
639 |
NULL, block_load, &block_mig_state);
|
640 |
} |