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@@ -1,1018 +0,0 @@
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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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- * Contributions after 2012-01-13 are licensed under the terms of the
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- * GNU GPL, version 2 or (at your option) any later version.
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- */
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-
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-#include "qemu/osdep.h"
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-#include "qapi/error.h"
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-#include "qemu/error-report.h"
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-#include "qemu/main-loop.h"
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-#include "qemu/cutils.h"
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-#include "qemu/queue.h"
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-#include "block.h"
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-#include "block/dirty-bitmap.h"
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-#include "migration/misc.h"
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-#include "migration.h"
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-#include "migration-stats.h"
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-#include "migration/register.h"
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-#include "qemu-file.h"
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-#include "migration/vmstate.h"
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-#include "sysemu/block-backend.h"
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-#include "trace.h"
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-#include "options.h"
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-
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-#define BLK_MIG_BLOCK_SIZE (1ULL << 20)
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-#define BDRV_SECTORS_PER_DIRTY_CHUNK (BLK_MIG_BLOCK_SIZE >> 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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-#define BLK_MIG_FLAG_ZERO_BLOCK 0x08
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-
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-#define MAX_IS_ALLOCATED_SEARCH (65536 * BDRV_SECTOR_SIZE)
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-
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-#define MAX_IO_BUFFERS 512
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-#define MAX_PARALLEL_IO 16
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-
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-typedef struct BlkMigDevState {
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- /* Written during setup phase. Can be read without a lock. */
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- BlockBackend *blk;
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- char *blk_name;
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- int shared_base;
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- int64_t total_sectors;
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- QSIMPLEQ_ENTRY(BlkMigDevState) entry;
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- Error *blocker;
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-
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- /* Only used by migration thread. Does not need a lock. */
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- int bulk_completed;
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- int64_t cur_sector;
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- int64_t cur_dirty;
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-
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- /* Data in the aio_bitmap is protected by block migration lock.
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- * Allocation and free happen during setup and cleanup respectively.
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- */
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- unsigned long *aio_bitmap;
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-
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- /* Protected by block migration lock. */
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- int64_t completed_sectors;
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-
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- /* During migration this is protected by bdrv_dirty_bitmap_lock().
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- * Allocation and free happen during setup and cleanup respectively.
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- */
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- BdrvDirtyBitmap *dirty_bitmap;
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-} BlkMigDevState;
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-
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-typedef struct BlkMigBlock {
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- /* Only used by migration thread. */
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- uint8_t *buf;
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- BlkMigDevState *bmds;
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- int64_t sector;
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- int nr_sectors;
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- QEMUIOVector qiov;
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- BlockAIOCB *aiocb;
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-
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- /* Protected by block migration lock. */
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- int ret;
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- QSIMPLEQ_ENTRY(BlkMigBlock) entry;
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-} BlkMigBlock;
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-
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-typedef struct BlkMigState {
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- QSIMPLEQ_HEAD(, BlkMigDevState) bmds_list;
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- int64_t total_sector_sum;
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- bool zero_blocks;
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-
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- /* Protected by lock. */
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- QSIMPLEQ_HEAD(, BlkMigBlock) blk_list;
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- int submitted;
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- int read_done;
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-
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- /* Only used by migration thread. Does not need a lock. */
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- int transferred;
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- int prev_progress;
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- int bulk_completed;
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-
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- /* Lock must be taken _inside_ the BQL. */
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- QemuMutex lock;
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-} BlkMigState;
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-
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-static BlkMigState block_mig_state;
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-
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-static void blk_mig_lock(void)
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-{
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- qemu_mutex_lock(&block_mig_state.lock);
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-}
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-
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-static void blk_mig_unlock(void)
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-{
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- qemu_mutex_unlock(&block_mig_state.lock);
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-}
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-
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-/* Must run outside of the BQL during the bulk phase,
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- * or the VM will stall.
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- */
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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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- uint64_t flags = BLK_MIG_FLAG_DEVICE_BLOCK;
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-
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- if (block_mig_state.zero_blocks &&
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- buffer_is_zero(blk->buf, BLK_MIG_BLOCK_SIZE)) {
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- flags |= BLK_MIG_FLAG_ZERO_BLOCK;
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- }
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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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- | flags);
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-
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- /* device name */
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- len = strlen(blk->bmds->blk_name);
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- qemu_put_byte(f, len);
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- qemu_put_buffer(f, (uint8_t *) blk->bmds->blk_name, len);
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-
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- /* if a block is zero we need to flush here since the network
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- * bandwidth is now a lot higher than the storage device bandwidth.
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- * thus if we queue zero blocks we slow down the migration */
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- if (flags & BLK_MIG_FLAG_ZERO_BLOCK) {
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- qemu_fflush(f);
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- return;
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- }
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-
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- qemu_put_buffer(f, blk->buf, BLK_MIG_BLOCK_SIZE);
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-}
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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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-
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-int blk_mig_bulk_active(void)
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-{
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- return blk_mig_active() && !block_mig_state.bulk_completed;
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-}
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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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- blk_mig_lock();
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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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- blk_mig_unlock();
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- return sum << BDRV_SECTOR_BITS;
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-}
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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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-
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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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-
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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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-
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-
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-/* Called with migration lock held. */
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-
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-static int bmds_aio_inflight(BlkMigDevState *bmds, int64_t sector)
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-{
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- int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK;
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-
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- if (sector < bmds->total_sectors) {
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- return !!(bmds->aio_bitmap[chunk / (sizeof(unsigned long) * 8)] &
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- (1UL << (chunk % (sizeof(unsigned long) * 8))));
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- } else {
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- return 0;
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- }
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-}
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-
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-/* Called with migration lock held. */
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-
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-static void bmds_set_aio_inflight(BlkMigDevState *bmds, int64_t sector_num,
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- int nb_sectors, int set)
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-{
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- int64_t start, end;
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- unsigned long val, idx, bit;
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-
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- start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK;
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- end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK;
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-
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- for (; start <= end; start++) {
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- idx = start / (sizeof(unsigned long) * 8);
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- bit = start % (sizeof(unsigned long) * 8);
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- val = bmds->aio_bitmap[idx];
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- if (set) {
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- val |= 1UL << bit;
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- } else {
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- val &= ~(1UL << bit);
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- }
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- bmds->aio_bitmap[idx] = val;
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- }
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-}
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-
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-static void alloc_aio_bitmap(BlkMigDevState *bmds)
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-{
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- int64_t bitmap_size;
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-
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- bitmap_size = bmds->total_sectors + BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1;
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- bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
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-
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- bmds->aio_bitmap = g_malloc0(bitmap_size);
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-}
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-
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-/* Never hold migration lock when yielding to the main loop! */
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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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-
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- blk_mig_lock();
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- blk->ret = ret;
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-
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- QSIMPLEQ_INSERT_TAIL(&block_mig_state.blk_list, blk, entry);
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- bmds_set_aio_inflight(blk->bmds, blk->sector, blk->nr_sectors, 0);
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-
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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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- blk_mig_unlock();
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-}
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-
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-/* Called with no lock taken. */
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-
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-static int mig_save_device_bulk(QEMUFile *f, 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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- BlockBackend *bb = bmds->blk;
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- BlkMigBlock *blk;
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- int nr_sectors;
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- int64_t count;
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-
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- if (bmds->shared_base) {
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- bql_lock();
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- /* Skip unallocated sectors; intentionally treats failure or
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- * partial sector as an allocated sector */
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- while (cur_sector < total_sectors &&
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- !bdrv_is_allocated(blk_bs(bb), cur_sector * BDRV_SECTOR_SIZE,
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- MAX_IS_ALLOCATED_SEARCH, &count)) {
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- if (count < BDRV_SECTOR_SIZE) {
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- break;
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- }
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- cur_sector += count >> BDRV_SECTOR_BITS;
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- }
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- bql_unlock();
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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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-
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- bmds->completed_sectors = cur_sector;
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-
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- cur_sector &= ~((int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK - 1);
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-
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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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-
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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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-
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- blk = g_new(BlkMigBlock, 1);
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- blk->buf = g_malloc(BLK_MIG_BLOCK_SIZE);
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- blk->bmds = bmds;
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- blk->sector = cur_sector;
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- blk->nr_sectors = nr_sectors;
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-
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- qemu_iovec_init_buf(&blk->qiov, blk->buf, nr_sectors * BDRV_SECTOR_SIZE);
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-
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- blk_mig_lock();
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- block_mig_state.submitted++;
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- blk_mig_unlock();
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-
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- /*
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- * The migration thread does not have an AioContext. Lock the BQL so that
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- * I/O runs in the main loop AioContext (see
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- * qemu_get_current_aio_context()).
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- */
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- bql_lock();
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- bdrv_reset_dirty_bitmap(bmds->dirty_bitmap, cur_sector * BDRV_SECTOR_SIZE,
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- nr_sectors * BDRV_SECTOR_SIZE);
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- blk->aiocb = blk_aio_preadv(bb, cur_sector * BDRV_SECTOR_SIZE, &blk->qiov,
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- 0, blk_mig_read_cb, blk);
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- bql_unlock();
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-
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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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-}
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-
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-/* Called with the BQL taken. */
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-
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-static int set_dirty_tracking(void)
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-{
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- BlkMigDevState *bmds;
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- int ret;
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-
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- QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
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- bmds->dirty_bitmap = bdrv_create_dirty_bitmap(blk_bs(bmds->blk),
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- BLK_MIG_BLOCK_SIZE,
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- NULL, NULL);
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- if (!bmds->dirty_bitmap) {
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- ret = -errno;
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- goto fail;
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- }
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- }
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- return 0;
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-
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-fail:
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- QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
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- if (bmds->dirty_bitmap) {
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- bdrv_release_dirty_bitmap(bmds->dirty_bitmap);
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- }
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- }
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- return ret;
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-}
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-
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-/* Called with the BQL taken. */
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-
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-static void unset_dirty_tracking(void)
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-{
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- BlkMigDevState *bmds;
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-
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- QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
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- if (bmds->dirty_bitmap) {
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- bdrv_release_dirty_bitmap(bmds->dirty_bitmap);
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- }
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- }
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-}
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-
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-static int init_blk_migration(QEMUFile *f, Error **errp)
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-{
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- BlockDriverState *bs;
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- BlkMigDevState *bmds;
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- int64_t sectors;
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- BdrvNextIterator it;
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- int i, num_bs = 0;
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- struct {
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- BlkMigDevState *bmds;
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- BlockDriverState *bs;
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- } *bmds_bs;
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- int ret;
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-
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- GRAPH_RDLOCK_GUARD_MAINLOOP();
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-
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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.zero_blocks = migrate_zero_blocks();
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-
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- for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) {
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- num_bs++;
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- }
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- bmds_bs = g_malloc0(num_bs * sizeof(*bmds_bs));
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-
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- 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) {
|
|
|
- continue;
|
|
|
- }
|
|
|
- if (sectors < 0) {
|
|
|
- error_setg(errp, "Error getting length of block device %s",
|
|
|
- bdrv_get_device_name(bs));
|
|
|
- ret = sectors;
|
|
|
- bdrv_next_cleanup(&it);
|
|
|
- goto out;
|
|
|
- }
|
|
|
-
|
|
|
- bmds = g_new0(BlkMigDevState, 1);
|
|
|
- bmds->blk = blk_new(qemu_get_aio_context(),
|
|
|
- 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;
|
|
|
-
|
|
|
- assert(i < num_bs);
|
|
|
- bmds_bs[i].bmds = bmds;
|
|
|
- bmds_bs[i].bs = bs;
|
|
|
-
|
|
|
- block_mig_state.total_sector_sum += sectors;
|
|
|
-
|
|
|
- if (bmds->shared_base) {
|
|
|
- trace_migration_block_init_shared(bdrv_get_device_name(bs));
|
|
|
- } else {
|
|
|
- trace_migration_block_init_full(bdrv_get_device_name(bs));
|
|
|
- }
|
|
|
-
|
|
|
- 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++) {
|
|
|
- bmds = bmds_bs[i].bmds;
|
|
|
- bs = bmds_bs[i].bs;
|
|
|
-
|
|
|
- if (bmds) {
|
|
|
- ret = blk_insert_bs(bmds->blk, bs, errp);
|
|
|
- if (ret < 0) {
|
|
|
- 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. */
|
|
|
-
|
|
|
-static int blk_mig_save_bulked_block(QEMUFile *f)
|
|
|
-{
|
|
|
- int64_t completed_sector_sum = 0;
|
|
|
- BlkMigDevState *bmds;
|
|
|
- int progress;
|
|
|
- int ret = 0;
|
|
|
-
|
|
|
- QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
|
|
|
- if (bmds->bulk_completed == 0) {
|
|
|
- if (mig_save_device_bulk(f, bmds) == 1) {
|
|
|
- /* completed bulk section for this device */
|
|
|
- bmds->bulk_completed = 1;
|
|
|
- }
|
|
|
- completed_sector_sum += bmds->completed_sectors;
|
|
|
- ret = 1;
|
|
|
- break;
|
|
|
- } else {
|
|
|
- completed_sector_sum += bmds->completed_sectors;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- 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)
|
|
|
- | BLK_MIG_FLAG_PROGRESS);
|
|
|
- trace_migration_block_progression(progress);
|
|
|
- }
|
|
|
-
|
|
|
- return ret;
|
|
|
-}
|
|
|
-
|
|
|
-static void blk_mig_reset_dirty_cursor(void)
|
|
|
-{
|
|
|
- BlkMigDevState *bmds;
|
|
|
-
|
|
|
- QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
|
|
|
- bmds->cur_dirty = 0;
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-/* Called with the BQL taken. */
|
|
|
-
|
|
|
-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;) {
|
|
|
- blk_mig_lock();
|
|
|
- if (bmds_aio_inflight(bmds, sector)) {
|
|
|
- blk_mig_unlock();
|
|
|
- blk_drain(bmds->blk);
|
|
|
- } else {
|
|
|
- blk_mig_unlock();
|
|
|
- }
|
|
|
- bdrv_dirty_bitmap_lock(bmds->dirty_bitmap);
|
|
|
- if (bdrv_dirty_bitmap_get_locked(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(BLK_MIG_BLOCK_SIZE);
|
|
|
- blk->bmds = bmds;
|
|
|
- blk->sector = sector;
|
|
|
- blk->nr_sectors = nr_sectors;
|
|
|
-
|
|
|
- if (is_async) {
|
|
|
- qemu_iovec_init_buf(&blk->qiov, blk->buf,
|
|
|
- nr_sectors * BDRV_SECTOR_SIZE);
|
|
|
-
|
|
|
- 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 = blk_pread(bmds->blk, sector * BDRV_SECTOR_SIZE,
|
|
|
- nr_sectors * BDRV_SECTOR_SIZE, blk->buf, 0);
|
|
|
- if (ret < 0) {
|
|
|
- goto error;
|
|
|
- }
|
|
|
- blk_send(f, blk);
|
|
|
-
|
|
|
- g_free(blk->buf);
|
|
|
- g_free(blk);
|
|
|
- }
|
|
|
-
|
|
|
- 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;
|
|
|
- }
|
|
|
-
|
|
|
- return (bmds->cur_dirty >= bmds->total_sectors);
|
|
|
-
|
|
|
-error:
|
|
|
- trace_migration_block_save_device_dirty(sector);
|
|
|
- g_free(blk->buf);
|
|
|
- g_free(blk);
|
|
|
- return ret;
|
|
|
-}
|
|
|
-
|
|
|
-/* Called with the BQL taken.
|
|
|
- *
|
|
|
- * return value:
|
|
|
- * 0: too much data for max_downtime
|
|
|
- * 1: few enough data for max_downtime
|
|
|
-*/
|
|
|
-static int blk_mig_save_dirty_block(QEMUFile *f, int is_async)
|
|
|
-{
|
|
|
- BlkMigDevState *bmds;
|
|
|
- int ret = 1;
|
|
|
-
|
|
|
- QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
|
|
|
- ret = mig_save_device_dirty(f, bmds, is_async);
|
|
|
- if (ret <= 0) {
|
|
|
- break;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- return ret;
|
|
|
-}
|
|
|
-
|
|
|
-/* Called with no locks taken. */
|
|
|
-
|
|
|
-static int flush_blks(QEMUFile *f)
|
|
|
-{
|
|
|
- BlkMigBlock *blk;
|
|
|
- int ret = 0;
|
|
|
-
|
|
|
- trace_migration_block_flush_blks("Enter", block_mig_state.submitted,
|
|
|
- block_mig_state.read_done,
|
|
|
- block_mig_state.transferred);
|
|
|
-
|
|
|
- blk_mig_lock();
|
|
|
- while ((blk = QSIMPLEQ_FIRST(&block_mig_state.blk_list)) != NULL) {
|
|
|
- if (migration_rate_exceeded(f)) {
|
|
|
- break;
|
|
|
- }
|
|
|
- if (blk->ret < 0) {
|
|
|
- ret = blk->ret;
|
|
|
- break;
|
|
|
- }
|
|
|
-
|
|
|
- QSIMPLEQ_REMOVE_HEAD(&block_mig_state.blk_list, entry);
|
|
|
- blk_mig_unlock();
|
|
|
- blk_send(f, blk);
|
|
|
- blk_mig_lock();
|
|
|
-
|
|
|
- g_free(blk->buf);
|
|
|
- g_free(blk);
|
|
|
-
|
|
|
- block_mig_state.read_done--;
|
|
|
- block_mig_state.transferred++;
|
|
|
- assert(block_mig_state.read_done >= 0);
|
|
|
- }
|
|
|
- blk_mig_unlock();
|
|
|
-
|
|
|
- trace_migration_block_flush_blks("Exit", block_mig_state.submitted,
|
|
|
- block_mig_state.read_done,
|
|
|
- block_mig_state.transferred);
|
|
|
- return ret;
|
|
|
-}
|
|
|
-
|
|
|
-/* Called with the BQL taken. */
|
|
|
-
|
|
|
-static int64_t get_remaining_dirty(void)
|
|
|
-{
|
|
|
- BlkMigDevState *bmds;
|
|
|
- int64_t dirty = 0;
|
|
|
-
|
|
|
- QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
|
|
|
- bdrv_dirty_bitmap_lock(bmds->dirty_bitmap);
|
|
|
- dirty += bdrv_get_dirty_count(bmds->dirty_bitmap);
|
|
|
- bdrv_dirty_bitmap_unlock(bmds->dirty_bitmap);
|
|
|
- }
|
|
|
-
|
|
|
- return dirty;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-
|
|
|
-/* Called with the BQL taken. */
|
|
|
-static void block_migration_cleanup_bmds(void)
|
|
|
-{
|
|
|
- BlkMigDevState *bmds;
|
|
|
- BlockDriverState *bs;
|
|
|
-
|
|
|
- unset_dirty_tracking();
|
|
|
-
|
|
|
- while ((bmds = QSIMPLEQ_FIRST(&block_mig_state.bmds_list)) != NULL) {
|
|
|
- QSIMPLEQ_REMOVE_HEAD(&block_mig_state.bmds_list, entry);
|
|
|
-
|
|
|
- bs = blk_bs(bmds->blk);
|
|
|
- if (bs) {
|
|
|
- bdrv_op_unblock_all(bs, bmds->blocker);
|
|
|
- }
|
|
|
- error_free(bmds->blocker);
|
|
|
- blk_unref(bmds->blk);
|
|
|
- g_free(bmds->blk_name);
|
|
|
- g_free(bmds->aio_bitmap);
|
|
|
- g_free(bmds);
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-/* Called with the BQL 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) {
|
|
|
- QSIMPLEQ_REMOVE_HEAD(&block_mig_state.blk_list, entry);
|
|
|
- g_free(blk->buf);
|
|
|
- g_free(blk);
|
|
|
- }
|
|
|
- blk_mig_unlock();
|
|
|
-}
|
|
|
-
|
|
|
-static int block_save_setup(QEMUFile *f, void *opaque, Error **errp)
|
|
|
-{
|
|
|
- int ret;
|
|
|
-
|
|
|
- trace_migration_block_save("setup", block_mig_state.submitted,
|
|
|
- block_mig_state.transferred);
|
|
|
-
|
|
|
- warn_report("block migration is deprecated;"
|
|
|
- " use blockdev-mirror with NBD instead");
|
|
|
-
|
|
|
- ret = init_blk_migration(f, errp);
|
|
|
- if (ret < 0) {
|
|
|
- return ret;
|
|
|
- }
|
|
|
-
|
|
|
- /* start track dirty blocks */
|
|
|
- ret = set_dirty_tracking();
|
|
|
- if (ret) {
|
|
|
- error_setg_errno(errp, -ret, "Failed to start block dirty tracking");
|
|
|
- return ret;
|
|
|
- }
|
|
|
-
|
|
|
- ret = flush_blks(f);
|
|
|
- if (ret) {
|
|
|
- error_setg_errno(errp, -ret, "Flushing block failed");
|
|
|
- return ret;
|
|
|
- }
|
|
|
- blk_mig_reset_dirty_cursor();
|
|
|
- qemu_put_be64(f, BLK_MIG_FLAG_EOS);
|
|
|
-
|
|
|
- return ret;
|
|
|
-}
|
|
|
-
|
|
|
-static int block_save_iterate(QEMUFile *f, void *opaque)
|
|
|
-{
|
|
|
- int ret;
|
|
|
- uint64_t last_bytes = qemu_file_transferred(f);
|
|
|
-
|
|
|
- trace_migration_block_save("iterate", block_mig_state.submitted,
|
|
|
- block_mig_state.transferred);
|
|
|
-
|
|
|
- ret = flush_blks(f);
|
|
|
- if (ret) {
|
|
|
- return ret;
|
|
|
- }
|
|
|
-
|
|
|
- blk_mig_reset_dirty_cursor();
|
|
|
-
|
|
|
- /* control the rate of transfer */
|
|
|
- blk_mig_lock();
|
|
|
- while (block_mig_state.read_done * BLK_MIG_BLOCK_SIZE <
|
|
|
- migration_rate_get() &&
|
|
|
- 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 */
|
|
|
- if (blk_mig_save_bulked_block(f) == 0) {
|
|
|
- /* finished saving bulk on all devices */
|
|
|
- block_mig_state.bulk_completed = 1;
|
|
|
- }
|
|
|
- ret = 0;
|
|
|
- } else {
|
|
|
- /* Always called with the BQL taken for
|
|
|
- * simplicity, block_save_complete also calls it.
|
|
|
- */
|
|
|
- bql_lock();
|
|
|
- ret = blk_mig_save_dirty_block(f, 1);
|
|
|
- bql_unlock();
|
|
|
- }
|
|
|
- if (ret < 0) {
|
|
|
- return ret;
|
|
|
- }
|
|
|
- blk_mig_lock();
|
|
|
- if (ret != 0) {
|
|
|
- /* no more dirty blocks */
|
|
|
- break;
|
|
|
- }
|
|
|
- }
|
|
|
- blk_mig_unlock();
|
|
|
-
|
|
|
- ret = flush_blks(f);
|
|
|
- if (ret) {
|
|
|
- return ret;
|
|
|
- }
|
|
|
-
|
|
|
- qemu_put_be64(f, BLK_MIG_FLAG_EOS);
|
|
|
- uint64_t delta_bytes = qemu_file_transferred(f) - last_bytes;
|
|
|
- return (delta_bytes > 0);
|
|
|
-}
|
|
|
-
|
|
|
-/* Called with the BQL taken. */
|
|
|
-
|
|
|
-static int block_save_complete(QEMUFile *f, void *opaque)
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-{
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- int ret;
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-
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- trace_migration_block_save("complete", block_mig_state.submitted,
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- block_mig_state.transferred);
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-
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- ret = flush_blks(f);
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- if (ret) {
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- return ret;
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- }
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-
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- blk_mig_reset_dirty_cursor();
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-
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- /* we know for sure that save bulk is completed and
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- all async read completed */
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- blk_mig_lock();
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- assert(block_mig_state.submitted == 0);
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- blk_mig_unlock();
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-
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- do {
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- ret = blk_mig_save_dirty_block(f, 0);
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- if (ret < 0) {
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- return ret;
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- }
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- } while (ret == 0);
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-
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- /* report completion */
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- qemu_put_be64(f, (100 << BDRV_SECTOR_BITS) | BLK_MIG_FLAG_PROGRESS);
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-
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- trace_migration_block_save_complete();
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-
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- qemu_put_be64(f, BLK_MIG_FLAG_EOS);
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-
|
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- /* Make sure that our BlockBackends are gone, so that the block driver
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- * nodes can be inactivated. */
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- block_migration_cleanup_bmds();
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-
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- return 0;
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-}
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-
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-static void block_state_pending(void *opaque, uint64_t *must_precopy,
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- uint64_t *can_postcopy)
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-{
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- /* Estimate pending number of bytes to send */
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- uint64_t pending;
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-
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- bql_lock();
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- pending = get_remaining_dirty();
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- bql_unlock();
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-
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- blk_mig_lock();
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- pending += block_mig_state.submitted * BLK_MIG_BLOCK_SIZE +
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- block_mig_state.read_done * BLK_MIG_BLOCK_SIZE;
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- blk_mig_unlock();
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-
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- /* Report at least one block pending during bulk phase */
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- if (!pending && !block_mig_state.bulk_completed) {
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- pending = BLK_MIG_BLOCK_SIZE;
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- }
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-
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- trace_migration_block_state_pending(pending);
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- /* We don't do postcopy */
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- *must_precopy += pending;
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-}
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-
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-static int block_load(QEMUFile *f, void *opaque, int version_id)
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-{
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- static int banner_printed;
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- int len, flags;
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- char device_name[256];
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- int64_t addr;
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- BlockBackend *blk, *blk_prev = NULL;
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- Error *local_err = NULL;
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- uint8_t *buf;
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- int64_t total_sectors = 0;
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- int nr_sectors;
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- int ret;
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- BlockDriverInfo bdi;
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- int cluster_size = BLK_MIG_BLOCK_SIZE;
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-
|
|
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- do {
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- addr = qemu_get_be64(f);
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-
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- flags = addr & (BDRV_SECTOR_SIZE - 1);
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- addr >>= BDRV_SECTOR_BITS;
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-
|
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- if (flags & BLK_MIG_FLAG_DEVICE_BLOCK) {
|
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- /* get device name */
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- len = qemu_get_byte(f);
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- qemu_get_buffer(f, (uint8_t *)device_name, len);
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- device_name[len] = '\0';
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-
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- blk = blk_by_name(device_name);
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|
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- if (!blk) {
|
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- fprintf(stderr, "Error unknown block device %s\n",
|
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- device_name);
|
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- return -EINVAL;
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- }
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-
|
|
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- if (blk != blk_prev) {
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- blk_prev = blk;
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- total_sectors = blk_nb_sectors(blk);
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- if (total_sectors <= 0) {
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- error_report("Error getting length of block device %s",
|
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- device_name);
|
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- return -EINVAL;
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|
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- }
|
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-
|
|
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- blk_activate(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 <= BLK_MIG_BLOCK_SIZE &&
|
|
|
- BLK_MIG_BLOCK_SIZE % bdi.cluster_size == 0) {
|
|
|
- cluster_size = bdi.cluster_size;
|
|
|
- } else {
|
|
|
- cluster_size = BLK_MIG_BLOCK_SIZE;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- if (total_sectors - addr < BDRV_SECTORS_PER_DIRTY_CHUNK) {
|
|
|
- nr_sectors = total_sectors - addr;
|
|
|
- } else {
|
|
|
- nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK;
|
|
|
- }
|
|
|
-
|
|
|
- if (flags & BLK_MIG_FLAG_ZERO_BLOCK) {
|
|
|
- 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(BLK_MIG_BLOCK_SIZE);
|
|
|
- qemu_get_buffer(f, buf, BLK_MIG_BLOCK_SIZE);
|
|
|
- for (i = 0; i < BLK_MIG_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 < BLK_MIG_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, cluster_size, cur_buf,
|
|
|
- 0);
|
|
|
- }
|
|
|
- if (ret < 0) {
|
|
|
- break;
|
|
|
- }
|
|
|
- }
|
|
|
- g_free(buf);
|
|
|
- }
|
|
|
-
|
|
|
- if (ret < 0) {
|
|
|
- return ret;
|
|
|
- }
|
|
|
- } else if (flags & BLK_MIG_FLAG_PROGRESS) {
|
|
|
- if (!banner_printed) {
|
|
|
- printf("Receiving block device images\n");
|
|
|
- banner_printed = 1;
|
|
|
- }
|
|
|
- printf("Completed %d %%%c", (int)addr,
|
|
|
- (addr == 100) ? '\n' : '\r');
|
|
|
- fflush(stdout);
|
|
|
- } else if (!(flags & BLK_MIG_FLAG_EOS)) {
|
|
|
- fprintf(stderr, "Unknown block migration flags: 0x%x\n", flags);
|
|
|
- return -EINVAL;
|
|
|
- }
|
|
|
- ret = qemu_file_get_error(f);
|
|
|
- if (ret != 0) {
|
|
|
- return ret;
|
|
|
- }
|
|
|
- } while (!(flags & BLK_MIG_FLAG_EOS));
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-static bool block_is_active(void *opaque)
|
|
|
-{
|
|
|
- return migrate_block();
|
|
|
-}
|
|
|
-
|
|
|
-static SaveVMHandlers savevm_block_handlers = {
|
|
|
- .save_setup = block_save_setup,
|
|
|
- .save_live_iterate = block_save_iterate,
|
|
|
- .save_live_complete_precopy = block_save_complete,
|
|
|
- .state_pending_exact = block_state_pending,
|
|
|
- .state_pending_estimate = block_state_pending,
|
|
|
- .load_state = block_load,
|
|
|
- .save_cleanup = block_migration_cleanup,
|
|
|
- .is_active = block_is_active,
|
|
|
-};
|
|
|
-
|
|
|
-void blk_mig_init(void)
|
|
|
-{
|
|
|
- QSIMPLEQ_INIT(&block_mig_state.bmds_list);
|
|
|
- QSIMPLEQ_INIT(&block_mig_state.blk_list);
|
|
|
- qemu_mutex_init(&block_mig_state.lock);
|
|
|
-
|
|
|
- register_savevm_live("block", 0, 1, &savevm_block_handlers,
|
|
|
- &block_mig_state);
|
|
|
-}
|
Fabiano Rosas