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![Cédric Le Goater](/assets/img/avatar_default.png)
The purpose is to record a potential error in the migration stream if qemu_savevm_state_setup() fails. Most of the current .save_setup() handlers can be modified to use the Error argument instead of managing their own and calling locally error_report(). Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Harsh Prateek Bora <harshpb@linux.ibm.com> Cc: Halil Pasic <pasic@linux.ibm.com> Cc: Thomas Huth <thuth@redhat.com> Cc: Eric Blake <eblake@redhat.com> Cc: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru> Cc: John Snow <jsnow@redhat.com> Cc: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Peter Xu <peterx@redhat.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru> Signed-off-by: Cédric Le Goater <clg@redhat.com> Link: https://lore.kernel.org/r/20240320064911.545001-8-clg@redhat.com Signed-off-by: Peter Xu <peterx@redhat.com>
1274 lines
38 KiB
C
1274 lines
38 KiB
C
/*
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* Block dirty bitmap postcopy migration
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*
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* Copyright IBM, Corp. 2009
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* Copyright (c) 2016-2017 Virtuozzo International GmbH. All rights reserved.
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*
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* Authors:
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* Liran Schour <lirans@il.ibm.com>
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* Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.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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* This file is derived from migration/block.c, so it's author and IBM copyright
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* are here, although content is quite different.
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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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*
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* Here postcopy migration of dirty bitmaps is realized. Only QMP-addressable
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* bitmaps are migrated.
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*
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* Bitmap migration implies creating bitmap with the same name and granularity
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* in destination QEMU. If the bitmap with the same name (for the same node)
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* already exists on destination an error will be generated.
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*
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* format of migration:
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*
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* # Header (shared for different chunk types)
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* 1, 2 or 4 bytes: flags (see qemu_{put,put}_flags)
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* [ 1 byte: node alias size ] \ flags & DEVICE_NAME
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* [ n bytes: node alias ] /
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* [ 1 byte: bitmap alias size ] \ flags & BITMAP_NAME
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* [ n bytes: bitmap alias ] /
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*
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* # Start of bitmap migration (flags & START)
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* header
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* be64: granularity
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* 1 byte: bitmap flags (corresponds to BdrvDirtyBitmap)
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* bit 0 - bitmap is enabled
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* bit 1 - bitmap is persistent
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* bit 2 - bitmap is autoloading
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* bits 3-7 - reserved, must be zero
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*
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* # Complete of bitmap migration (flags & COMPLETE)
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* header
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*
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* # Data chunk of bitmap migration
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* header
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* be64: start sector
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* be32: number of sectors
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* [ be64: buffer size ] \ ! (flags & ZEROES)
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* [ n bytes: buffer ] /
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*
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* The last chunk in stream should contain flags & EOS. The chunk may skip
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* device and/or bitmap names, assuming them to be the same with the previous
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* chunk.
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*/
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#include "qemu/osdep.h"
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#include "block/block.h"
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#include "block/block_int.h"
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#include "block/dirty-bitmap.h"
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#include "sysemu/block-backend.h"
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#include "sysemu/runstate.h"
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#include "qemu/main-loop.h"
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#include "qemu/error-report.h"
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#include "migration/misc.h"
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#include "migration/migration.h"
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#include "qemu-file.h"
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#include "migration/vmstate.h"
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#include "migration/register.h"
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#include "qemu/hbitmap.h"
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#include "qemu/cutils.h"
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#include "qemu/id.h"
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#include "qapi/error.h"
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#include "qapi/qapi-commands-migration.h"
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#include "qapi/qapi-visit-migration.h"
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#include "qapi/clone-visitor.h"
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#include "trace.h"
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#include "options.h"
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#define CHUNK_SIZE (1 << 10)
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/* Flags occupy one, two or four bytes (Big Endian). The size is determined as
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* follows:
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* in first (most significant) byte bit 8 is clear --> one byte
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* in first byte bit 8 is set --> two or four bytes, depending on second
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* byte:
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* | in second byte bit 8 is clear --> two bytes
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* | in second byte bit 8 is set --> four bytes
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*/
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#define DIRTY_BITMAP_MIG_FLAG_EOS 0x01
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#define DIRTY_BITMAP_MIG_FLAG_ZEROES 0x02
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#define DIRTY_BITMAP_MIG_FLAG_BITMAP_NAME 0x04
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#define DIRTY_BITMAP_MIG_FLAG_DEVICE_NAME 0x08
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#define DIRTY_BITMAP_MIG_FLAG_START 0x10
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#define DIRTY_BITMAP_MIG_FLAG_COMPLETE 0x20
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#define DIRTY_BITMAP_MIG_FLAG_BITS 0x40
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#define DIRTY_BITMAP_MIG_EXTRA_FLAGS 0x80
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#define DIRTY_BITMAP_MIG_START_FLAG_ENABLED 0x01
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#define DIRTY_BITMAP_MIG_START_FLAG_PERSISTENT 0x02
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/* 0x04 was "AUTOLOAD" flags on older versions, now it is ignored */
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#define DIRTY_BITMAP_MIG_START_FLAG_RESERVED_MASK 0xf8
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/* State of one bitmap during save process */
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typedef struct SaveBitmapState {
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/* Written during setup phase. */
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BlockDriverState *bs;
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char *node_alias;
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char *bitmap_alias;
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BdrvDirtyBitmap *bitmap;
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uint64_t total_sectors;
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uint64_t sectors_per_chunk;
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QSIMPLEQ_ENTRY(SaveBitmapState) entry;
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uint8_t flags;
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/* For bulk phase. */
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bool bulk_completed;
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uint64_t cur_sector;
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} SaveBitmapState;
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/* State of the dirty bitmap migration (DBM) during save process */
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typedef struct DBMSaveState {
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QSIMPLEQ_HEAD(, SaveBitmapState) dbms_list;
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bool bulk_completed;
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bool no_bitmaps;
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/* for send_bitmap_bits() */
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BlockDriverState *prev_bs;
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BdrvDirtyBitmap *prev_bitmap;
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} DBMSaveState;
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typedef struct LoadBitmapState {
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BlockDriverState *bs;
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BdrvDirtyBitmap *bitmap;
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bool migrated;
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bool enabled;
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} LoadBitmapState;
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/* State of the dirty bitmap migration (DBM) during load process */
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typedef struct DBMLoadState {
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uint32_t flags;
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char node_alias[256];
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char bitmap_alias[256];
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char bitmap_name[BDRV_BITMAP_MAX_NAME_SIZE + 1];
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BlockDriverState *bs;
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BdrvDirtyBitmap *bitmap;
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bool before_vm_start_handled; /* set in dirty_bitmap_mig_before_vm_start */
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BitmapMigrationBitmapAlias *bmap_inner;
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/*
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* cancelled
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* Incoming migration is cancelled for some reason. That means that we
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* still should read our chunks from migration stream, to not affect other
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* migration objects (like RAM), but just ignore them and do not touch any
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* bitmaps or nodes.
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*/
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bool cancelled;
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GSList *bitmaps;
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QemuMutex lock; /* protect bitmaps */
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} DBMLoadState;
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typedef struct DBMState {
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DBMSaveState save;
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DBMLoadState load;
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} DBMState;
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static DBMState dbm_state;
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/* For hash tables that map node/bitmap names to aliases */
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typedef struct AliasMapInnerNode {
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char *string;
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GHashTable *subtree;
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} AliasMapInnerNode;
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static void free_alias_map_inner_node(void *amin_ptr)
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{
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AliasMapInnerNode *amin = amin_ptr;
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g_free(amin->string);
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g_hash_table_unref(amin->subtree);
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g_free(amin);
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}
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/**
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* Construct an alias map based on the given QMP structure.
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*
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* (Note that we cannot store such maps in the MigrationParameters
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* object, because that struct is defined by the QAPI schema, which
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* makes it basically impossible to have dicts with arbitrary keys.
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* Therefore, we instead have to construct these maps when migration
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* starts.)
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*
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* @bbm is the block_bitmap_mapping from the migration parameters.
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*
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* If @name_to_alias is true, the returned hash table will map node
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* and bitmap names to their respective aliases (for outgoing
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* migration).
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*
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* If @name_to_alias is false, the returned hash table will map node
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* and bitmap aliases to their respective names (for incoming
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* migration).
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*
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* The hash table maps node names/aliases to AliasMapInnerNode
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* objects, whose .string is the respective node alias/name, and whose
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* .subtree table maps bitmap names/aliases to the respective bitmap
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* alias/name.
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*/
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static GHashTable *construct_alias_map(const BitmapMigrationNodeAliasList *bbm,
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bool name_to_alias,
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Error **errp)
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{
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GHashTable *alias_map;
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size_t max_node_name_len = sizeof_field(BlockDriverState, node_name) - 1;
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alias_map = g_hash_table_new_full(g_str_hash, g_str_equal,
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g_free, free_alias_map_inner_node);
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for (; bbm; bbm = bbm->next) {
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const BitmapMigrationNodeAlias *bmna = bbm->value;
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const BitmapMigrationBitmapAliasList *bmbal;
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AliasMapInnerNode *amin;
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GHashTable *bitmaps_map;
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const char *node_map_from, *node_map_to;
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GDestroyNotify gdn;
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if (!id_wellformed(bmna->alias)) {
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error_setg(errp, "The node alias '%s' is not well-formed",
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bmna->alias);
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goto fail;
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}
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if (strlen(bmna->alias) > UINT8_MAX) {
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error_setg(errp, "The node alias '%s' is longer than %u bytes",
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bmna->alias, UINT8_MAX);
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goto fail;
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}
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if (strlen(bmna->node_name) > max_node_name_len) {
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error_setg(errp, "The node name '%s' is longer than %zu bytes",
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bmna->node_name, max_node_name_len);
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goto fail;
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}
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if (name_to_alias) {
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if (g_hash_table_contains(alias_map, bmna->node_name)) {
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error_setg(errp, "The node name '%s' is mapped twice",
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bmna->node_name);
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goto fail;
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}
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node_map_from = bmna->node_name;
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node_map_to = bmna->alias;
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} else {
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if (g_hash_table_contains(alias_map, bmna->alias)) {
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error_setg(errp, "The node alias '%s' is used twice",
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bmna->alias);
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goto fail;
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}
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node_map_from = bmna->alias;
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node_map_to = bmna->node_name;
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}
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gdn = (GDestroyNotify) qapi_free_BitmapMigrationBitmapAlias;
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bitmaps_map = g_hash_table_new_full(g_str_hash, g_str_equal, g_free,
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gdn);
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amin = g_new(AliasMapInnerNode, 1);
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*amin = (AliasMapInnerNode){
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.string = g_strdup(node_map_to),
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.subtree = bitmaps_map,
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};
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g_hash_table_insert(alias_map, g_strdup(node_map_from), amin);
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for (bmbal = bmna->bitmaps; bmbal; bmbal = bmbal->next) {
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const BitmapMigrationBitmapAlias *bmba = bmbal->value;
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const char *bmap_map_from;
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if (strlen(bmba->alias) > UINT8_MAX) {
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error_setg(errp,
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"The bitmap alias '%s' is longer than %u bytes",
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bmba->alias, UINT8_MAX);
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goto fail;
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}
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if (strlen(bmba->name) > BDRV_BITMAP_MAX_NAME_SIZE) {
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error_setg(errp, "The bitmap name '%s' is longer than %d bytes",
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bmba->name, BDRV_BITMAP_MAX_NAME_SIZE);
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goto fail;
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}
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if (name_to_alias) {
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bmap_map_from = bmba->name;
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if (g_hash_table_contains(bitmaps_map, bmba->name)) {
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error_setg(errp, "The bitmap '%s'/'%s' is mapped twice",
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bmna->node_name, bmba->name);
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goto fail;
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}
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} else {
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bmap_map_from = bmba->alias;
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if (g_hash_table_contains(bitmaps_map, bmba->alias)) {
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error_setg(errp, "The bitmap alias '%s'/'%s' is used twice",
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bmna->alias, bmba->alias);
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goto fail;
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}
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}
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g_hash_table_insert(bitmaps_map, g_strdup(bmap_map_from),
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QAPI_CLONE(BitmapMigrationBitmapAlias, bmba));
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}
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}
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return alias_map;
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fail:
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g_hash_table_destroy(alias_map);
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return NULL;
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}
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/**
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* Run construct_alias_map() in both directions to check whether @bbm
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* is valid.
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* (This function is to be used by migration/migration.c to validate
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* the user-specified block-bitmap-mapping migration parameter.)
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*
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* Returns true if and only if the mapping is valid.
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*/
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bool check_dirty_bitmap_mig_alias_map(const BitmapMigrationNodeAliasList *bbm,
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Error **errp)
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{
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GHashTable *alias_map;
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alias_map = construct_alias_map(bbm, true, errp);
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if (!alias_map) {
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return false;
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}
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g_hash_table_destroy(alias_map);
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alias_map = construct_alias_map(bbm, false, errp);
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if (!alias_map) {
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return false;
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}
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g_hash_table_destroy(alias_map);
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return true;
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}
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static uint32_t qemu_get_bitmap_flags(QEMUFile *f)
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{
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uint8_t flags = qemu_get_byte(f);
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if (flags & DIRTY_BITMAP_MIG_EXTRA_FLAGS) {
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flags = flags << 8 | qemu_get_byte(f);
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if (flags & DIRTY_BITMAP_MIG_EXTRA_FLAGS) {
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flags = flags << 16 | qemu_get_be16(f);
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}
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}
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return flags;
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}
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static void qemu_put_bitmap_flags(QEMUFile *f, uint32_t flags)
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{
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/* The code currently does not send flags as more than one byte */
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assert(!(flags & (0xffffff00 | DIRTY_BITMAP_MIG_EXTRA_FLAGS)));
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qemu_put_byte(f, flags);
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}
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static void send_bitmap_header(QEMUFile *f, DBMSaveState *s,
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SaveBitmapState *dbms, uint32_t additional_flags)
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{
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BlockDriverState *bs = dbms->bs;
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BdrvDirtyBitmap *bitmap = dbms->bitmap;
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uint32_t flags = additional_flags;
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trace_send_bitmap_header_enter();
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if (bs != s->prev_bs) {
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s->prev_bs = bs;
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flags |= DIRTY_BITMAP_MIG_FLAG_DEVICE_NAME;
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}
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if (bitmap != s->prev_bitmap) {
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s->prev_bitmap = bitmap;
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flags |= DIRTY_BITMAP_MIG_FLAG_BITMAP_NAME;
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}
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qemu_put_bitmap_flags(f, flags);
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if (flags & DIRTY_BITMAP_MIG_FLAG_DEVICE_NAME) {
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qemu_put_counted_string(f, dbms->node_alias);
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}
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if (flags & DIRTY_BITMAP_MIG_FLAG_BITMAP_NAME) {
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qemu_put_counted_string(f, dbms->bitmap_alias);
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}
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}
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|
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static void send_bitmap_start(QEMUFile *f, DBMSaveState *s,
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SaveBitmapState *dbms)
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{
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send_bitmap_header(f, s, dbms, DIRTY_BITMAP_MIG_FLAG_START);
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qemu_put_be32(f, bdrv_dirty_bitmap_granularity(dbms->bitmap));
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qemu_put_byte(f, dbms->flags);
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}
|
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|
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static void send_bitmap_complete(QEMUFile *f, DBMSaveState *s,
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SaveBitmapState *dbms)
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{
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send_bitmap_header(f, s, dbms, DIRTY_BITMAP_MIG_FLAG_COMPLETE);
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}
|
|
|
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static void send_bitmap_bits(QEMUFile *f, DBMSaveState *s,
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SaveBitmapState *dbms,
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uint64_t start_sector, uint32_t nr_sectors)
|
|
{
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/* align for buffer_is_zero() */
|
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uint64_t align = 4 * sizeof(long);
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uint64_t unaligned_size =
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bdrv_dirty_bitmap_serialization_size(
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dbms->bitmap, start_sector << BDRV_SECTOR_BITS,
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(uint64_t)nr_sectors << BDRV_SECTOR_BITS);
|
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uint64_t buf_size = QEMU_ALIGN_UP(unaligned_size, align);
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uint8_t *buf = g_malloc0(buf_size);
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uint32_t flags = DIRTY_BITMAP_MIG_FLAG_BITS;
|
|
|
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bdrv_dirty_bitmap_serialize_part(
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dbms->bitmap, buf, start_sector << BDRV_SECTOR_BITS,
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(uint64_t)nr_sectors << BDRV_SECTOR_BITS);
|
|
|
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if (buffer_is_zero(buf, buf_size)) {
|
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g_free(buf);
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buf = NULL;
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flags |= DIRTY_BITMAP_MIG_FLAG_ZEROES;
|
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}
|
|
|
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trace_send_bitmap_bits(flags, start_sector, nr_sectors, buf_size);
|
|
|
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send_bitmap_header(f, s, dbms, flags);
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|
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qemu_put_be64(f, start_sector);
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qemu_put_be32(f, nr_sectors);
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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.
|
|
* thus if we queue zero blocks we slow down the migration. */
|
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if (flags & DIRTY_BITMAP_MIG_FLAG_ZEROES) {
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qemu_fflush(f);
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} else {
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qemu_put_be64(f, buf_size);
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qemu_put_buffer(f, buf, buf_size);
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|
}
|
|
|
|
g_free(buf);
|
|
}
|
|
|
|
/* Called with the BQL taken. */
|
|
static void dirty_bitmap_do_save_cleanup(DBMSaveState *s)
|
|
{
|
|
SaveBitmapState *dbms;
|
|
|
|
while ((dbms = QSIMPLEQ_FIRST(&s->dbms_list)) != NULL) {
|
|
QSIMPLEQ_REMOVE_HEAD(&s->dbms_list, entry);
|
|
bdrv_dirty_bitmap_set_busy(dbms->bitmap, false);
|
|
bdrv_unref(dbms->bs);
|
|
g_free(dbms->node_alias);
|
|
g_free(dbms->bitmap_alias);
|
|
g_free(dbms);
|
|
}
|
|
}
|
|
|
|
/* Called with the BQL taken. */
|
|
static int add_bitmaps_to_list(DBMSaveState *s, BlockDriverState *bs,
|
|
const char *bs_name, GHashTable *alias_map)
|
|
{
|
|
BdrvDirtyBitmap *bitmap;
|
|
SaveBitmapState *dbms;
|
|
GHashTable *bitmap_aliases;
|
|
const char *node_alias, *bitmap_name, *bitmap_alias;
|
|
Error *local_err = NULL;
|
|
|
|
/* When an alias map is given, @bs_name must be @bs's node name */
|
|
assert(!alias_map || !strcmp(bs_name, bdrv_get_node_name(bs)));
|
|
|
|
FOR_EACH_DIRTY_BITMAP(bs, bitmap) {
|
|
if (bdrv_dirty_bitmap_name(bitmap)) {
|
|
break;
|
|
}
|
|
}
|
|
if (!bitmap) {
|
|
return 0;
|
|
}
|
|
|
|
bitmap_name = bdrv_dirty_bitmap_name(bitmap);
|
|
|
|
if (!bs_name || strcmp(bs_name, "") == 0) {
|
|
error_report("Bitmap '%s' in unnamed node can't be migrated",
|
|
bitmap_name);
|
|
return -1;
|
|
}
|
|
|
|
if (alias_map) {
|
|
const AliasMapInnerNode *amin = g_hash_table_lookup(alias_map, bs_name);
|
|
|
|
if (!amin) {
|
|
/* Skip bitmaps on nodes with no alias */
|
|
return 0;
|
|
}
|
|
|
|
node_alias = amin->string;
|
|
bitmap_aliases = amin->subtree;
|
|
} else {
|
|
node_alias = bs_name;
|
|
bitmap_aliases = NULL;
|
|
}
|
|
|
|
if (node_alias[0] == '#') {
|
|
error_report("Bitmap '%s' in a node with auto-generated "
|
|
"name '%s' can't be migrated",
|
|
bitmap_name, node_alias);
|
|
return -1;
|
|
}
|
|
|
|
FOR_EACH_DIRTY_BITMAP(bs, bitmap) {
|
|
BitmapMigrationBitmapAliasTransform *bitmap_transform = NULL;
|
|
bitmap_name = bdrv_dirty_bitmap_name(bitmap);
|
|
if (!bitmap_name) {
|
|
continue;
|
|
}
|
|
|
|
if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_DEFAULT, &local_err)) {
|
|
error_report_err(local_err);
|
|
return -1;
|
|
}
|
|
|
|
if (bitmap_aliases) {
|
|
BitmapMigrationBitmapAlias *bmap_inner;
|
|
|
|
bmap_inner = g_hash_table_lookup(bitmap_aliases, bitmap_name);
|
|
if (!bmap_inner) {
|
|
/* Skip bitmaps with no alias */
|
|
continue;
|
|
}
|
|
|
|
bitmap_alias = bmap_inner->alias;
|
|
if (bmap_inner->transform) {
|
|
bitmap_transform = bmap_inner->transform;
|
|
}
|
|
} else {
|
|
if (strlen(bitmap_name) > UINT8_MAX) {
|
|
error_report("Cannot migrate bitmap '%s' on node '%s': "
|
|
"Name is longer than %u bytes",
|
|
bitmap_name, bs_name, UINT8_MAX);
|
|
return -1;
|
|
}
|
|
bitmap_alias = bitmap_name;
|
|
}
|
|
|
|
bdrv_ref(bs);
|
|
bdrv_dirty_bitmap_set_busy(bitmap, true);
|
|
|
|
dbms = g_new0(SaveBitmapState, 1);
|
|
dbms->bs = bs;
|
|
dbms->node_alias = g_strdup(node_alias);
|
|
dbms->bitmap_alias = g_strdup(bitmap_alias);
|
|
dbms->bitmap = bitmap;
|
|
dbms->total_sectors = bdrv_nb_sectors(bs);
|
|
dbms->sectors_per_chunk = CHUNK_SIZE * 8LLU *
|
|
(bdrv_dirty_bitmap_granularity(bitmap) >> BDRV_SECTOR_BITS);
|
|
assert(dbms->sectors_per_chunk != 0);
|
|
if (bdrv_dirty_bitmap_enabled(bitmap)) {
|
|
dbms->flags |= DIRTY_BITMAP_MIG_START_FLAG_ENABLED;
|
|
}
|
|
if (bitmap_transform &&
|
|
bitmap_transform->has_persistent) {
|
|
if (bitmap_transform->persistent) {
|
|
dbms->flags |= DIRTY_BITMAP_MIG_START_FLAG_PERSISTENT;
|
|
}
|
|
} else {
|
|
if (bdrv_dirty_bitmap_get_persistence(bitmap)) {
|
|
dbms->flags |= DIRTY_BITMAP_MIG_START_FLAG_PERSISTENT;
|
|
}
|
|
}
|
|
|
|
QSIMPLEQ_INSERT_TAIL(&s->dbms_list, dbms, entry);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Called with the BQL taken. */
|
|
static int init_dirty_bitmap_migration(DBMSaveState *s)
|
|
{
|
|
BlockDriverState *bs;
|
|
SaveBitmapState *dbms;
|
|
GHashTable *handled_by_blk = g_hash_table_new(NULL, NULL);
|
|
BlockBackend *blk;
|
|
GHashTable *alias_map = NULL;
|
|
|
|
/* Runs in the migration thread, but holds the BQL */
|
|
GLOBAL_STATE_CODE();
|
|
GRAPH_RDLOCK_GUARD_MAINLOOP();
|
|
|
|
if (migrate_has_block_bitmap_mapping()) {
|
|
alias_map = construct_alias_map(migrate_block_bitmap_mapping(), true,
|
|
&error_abort);
|
|
}
|
|
|
|
s->bulk_completed = false;
|
|
s->prev_bs = NULL;
|
|
s->prev_bitmap = NULL;
|
|
s->no_bitmaps = false;
|
|
|
|
if (!alias_map) {
|
|
/*
|
|
* Use blockdevice name for direct (or filtered) children of named block
|
|
* backends.
|
|
*/
|
|
for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
|
|
const char *name = blk_name(blk);
|
|
|
|
if (!name || strcmp(name, "") == 0) {
|
|
continue;
|
|
}
|
|
|
|
bs = blk_bs(blk);
|
|
|
|
/* Skip filters without bitmaps */
|
|
while (bs && bs->drv && bs->drv->is_filter &&
|
|
!bdrv_has_named_bitmaps(bs))
|
|
{
|
|
bs = bdrv_filter_bs(bs);
|
|
}
|
|
|
|
if (bs && bs->drv && !bs->drv->is_filter) {
|
|
if (add_bitmaps_to_list(s, bs, name, NULL)) {
|
|
goto fail;
|
|
}
|
|
g_hash_table_add(handled_by_blk, bs);
|
|
}
|
|
}
|
|
}
|
|
|
|
for (bs = bdrv_next_all_states(NULL); bs; bs = bdrv_next_all_states(bs)) {
|
|
if (g_hash_table_contains(handled_by_blk, bs)) {
|
|
continue;
|
|
}
|
|
|
|
if (add_bitmaps_to_list(s, bs, bdrv_get_node_name(bs), alias_map)) {
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
/* unset migration flags here, to not roll back it */
|
|
QSIMPLEQ_FOREACH(dbms, &s->dbms_list, entry) {
|
|
bdrv_dirty_bitmap_skip_store(dbms->bitmap, true);
|
|
}
|
|
|
|
if (QSIMPLEQ_EMPTY(&s->dbms_list)) {
|
|
s->no_bitmaps = true;
|
|
}
|
|
|
|
g_hash_table_destroy(handled_by_blk);
|
|
if (alias_map) {
|
|
g_hash_table_destroy(alias_map);
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
g_hash_table_destroy(handled_by_blk);
|
|
if (alias_map) {
|
|
g_hash_table_destroy(alias_map);
|
|
}
|
|
dirty_bitmap_do_save_cleanup(s);
|
|
|
|
return -1;
|
|
}
|
|
|
|
/* Called with no lock taken. */
|
|
static void bulk_phase_send_chunk(QEMUFile *f, DBMSaveState *s,
|
|
SaveBitmapState *dbms)
|
|
{
|
|
uint32_t nr_sectors = MIN(dbms->total_sectors - dbms->cur_sector,
|
|
dbms->sectors_per_chunk);
|
|
|
|
send_bitmap_bits(f, s, dbms, dbms->cur_sector, nr_sectors);
|
|
|
|
dbms->cur_sector += nr_sectors;
|
|
if (dbms->cur_sector >= dbms->total_sectors) {
|
|
dbms->bulk_completed = true;
|
|
}
|
|
}
|
|
|
|
/* Called with no lock taken. */
|
|
static void bulk_phase(QEMUFile *f, DBMSaveState *s, bool limit)
|
|
{
|
|
SaveBitmapState *dbms;
|
|
|
|
QSIMPLEQ_FOREACH(dbms, &s->dbms_list, entry) {
|
|
while (!dbms->bulk_completed) {
|
|
bulk_phase_send_chunk(f, s, dbms);
|
|
if (limit && migration_rate_exceeded(f)) {
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
s->bulk_completed = true;
|
|
}
|
|
|
|
/* for SaveVMHandlers */
|
|
static void dirty_bitmap_save_cleanup(void *opaque)
|
|
{
|
|
DBMSaveState *s = &((DBMState *)opaque)->save;
|
|
|
|
dirty_bitmap_do_save_cleanup(s);
|
|
}
|
|
|
|
static int dirty_bitmap_save_iterate(QEMUFile *f, void *opaque)
|
|
{
|
|
DBMSaveState *s = &((DBMState *)opaque)->save;
|
|
|
|
trace_dirty_bitmap_save_iterate(migration_in_postcopy());
|
|
|
|
if (migration_in_postcopy() && !s->bulk_completed) {
|
|
bulk_phase(f, s, true);
|
|
}
|
|
|
|
qemu_put_bitmap_flags(f, DIRTY_BITMAP_MIG_FLAG_EOS);
|
|
|
|
return s->bulk_completed;
|
|
}
|
|
|
|
/* Called with the BQL taken. */
|
|
|
|
static int dirty_bitmap_save_complete(QEMUFile *f, void *opaque)
|
|
{
|
|
DBMSaveState *s = &((DBMState *)opaque)->save;
|
|
SaveBitmapState *dbms;
|
|
trace_dirty_bitmap_save_complete_enter();
|
|
|
|
if (!s->bulk_completed) {
|
|
bulk_phase(f, s, false);
|
|
}
|
|
|
|
QSIMPLEQ_FOREACH(dbms, &s->dbms_list, entry) {
|
|
send_bitmap_complete(f, s, dbms);
|
|
}
|
|
|
|
qemu_put_bitmap_flags(f, DIRTY_BITMAP_MIG_FLAG_EOS);
|
|
|
|
trace_dirty_bitmap_save_complete_finish();
|
|
|
|
dirty_bitmap_save_cleanup(opaque);
|
|
return 0;
|
|
}
|
|
|
|
static void dirty_bitmap_state_pending(void *opaque,
|
|
uint64_t *must_precopy,
|
|
uint64_t *can_postcopy)
|
|
{
|
|
DBMSaveState *s = &((DBMState *)opaque)->save;
|
|
SaveBitmapState *dbms;
|
|
uint64_t pending = 0;
|
|
|
|
bql_lock();
|
|
|
|
QSIMPLEQ_FOREACH(dbms, &s->dbms_list, entry) {
|
|
uint64_t gran = bdrv_dirty_bitmap_granularity(dbms->bitmap);
|
|
uint64_t sectors = dbms->bulk_completed ? 0 :
|
|
dbms->total_sectors - dbms->cur_sector;
|
|
|
|
pending += DIV_ROUND_UP(sectors * BDRV_SECTOR_SIZE, gran);
|
|
}
|
|
|
|
bql_unlock();
|
|
|
|
trace_dirty_bitmap_state_pending(pending);
|
|
|
|
*can_postcopy += pending;
|
|
}
|
|
|
|
/* First occurrence of this bitmap. It should be created if doesn't exist */
|
|
static int dirty_bitmap_load_start(QEMUFile *f, DBMLoadState *s)
|
|
{
|
|
Error *local_err = NULL;
|
|
uint32_t granularity = qemu_get_be32(f);
|
|
uint8_t flags = qemu_get_byte(f);
|
|
LoadBitmapState *b;
|
|
bool persistent;
|
|
|
|
if (s->cancelled) {
|
|
return 0;
|
|
}
|
|
|
|
if (s->bitmap) {
|
|
error_report("Bitmap with the same name ('%s') already exists on "
|
|
"destination", bdrv_dirty_bitmap_name(s->bitmap));
|
|
return -EINVAL;
|
|
} else {
|
|
s->bitmap = bdrv_create_dirty_bitmap(s->bs, granularity,
|
|
s->bitmap_name, &local_err);
|
|
if (!s->bitmap) {
|
|
error_report_err(local_err);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
if (flags & DIRTY_BITMAP_MIG_START_FLAG_RESERVED_MASK) {
|
|
error_report("Unknown flags in migrated dirty bitmap header: %x",
|
|
flags);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (s->bmap_inner &&
|
|
s->bmap_inner->transform &&
|
|
s->bmap_inner->transform->has_persistent) {
|
|
persistent = s->bmap_inner->transform->persistent;
|
|
} else {
|
|
persistent = flags & DIRTY_BITMAP_MIG_START_FLAG_PERSISTENT;
|
|
}
|
|
|
|
if (persistent) {
|
|
bdrv_dirty_bitmap_set_persistence(s->bitmap, true);
|
|
}
|
|
|
|
bdrv_disable_dirty_bitmap(s->bitmap);
|
|
if (flags & DIRTY_BITMAP_MIG_START_FLAG_ENABLED) {
|
|
bdrv_dirty_bitmap_create_successor(s->bitmap, &local_err);
|
|
if (local_err) {
|
|
error_report_err(local_err);
|
|
return -EINVAL;
|
|
}
|
|
} else {
|
|
bdrv_dirty_bitmap_set_busy(s->bitmap, true);
|
|
}
|
|
|
|
b = g_new(LoadBitmapState, 1);
|
|
b->bs = s->bs;
|
|
b->bitmap = s->bitmap;
|
|
b->migrated = false;
|
|
b->enabled = flags & DIRTY_BITMAP_MIG_START_FLAG_ENABLED;
|
|
|
|
s->bitmaps = g_slist_prepend(s->bitmaps, b);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* before_vm_start_handle_item
|
|
*
|
|
* g_slist_foreach helper
|
|
*
|
|
* item is LoadBitmapState*
|
|
* opaque is DBMLoadState*
|
|
*/
|
|
static void before_vm_start_handle_item(void *item, void *opaque)
|
|
{
|
|
DBMLoadState *s = opaque;
|
|
LoadBitmapState *b = item;
|
|
|
|
if (b->enabled) {
|
|
if (b->migrated) {
|
|
bdrv_enable_dirty_bitmap(b->bitmap);
|
|
} else {
|
|
bdrv_dirty_bitmap_enable_successor(b->bitmap);
|
|
}
|
|
}
|
|
|
|
if (b->migrated) {
|
|
s->bitmaps = g_slist_remove(s->bitmaps, b);
|
|
g_free(b);
|
|
}
|
|
}
|
|
|
|
void dirty_bitmap_mig_before_vm_start(void)
|
|
{
|
|
DBMLoadState *s = &dbm_state.load;
|
|
qemu_mutex_lock(&s->lock);
|
|
|
|
assert(!s->before_vm_start_handled);
|
|
g_slist_foreach(s->bitmaps, before_vm_start_handle_item, s);
|
|
s->before_vm_start_handled = true;
|
|
|
|
qemu_mutex_unlock(&s->lock);
|
|
}
|
|
|
|
static void cancel_incoming_locked(DBMLoadState *s)
|
|
{
|
|
GSList *item;
|
|
|
|
if (s->cancelled) {
|
|
return;
|
|
}
|
|
|
|
s->cancelled = true;
|
|
s->bs = NULL;
|
|
s->bitmap = NULL;
|
|
|
|
/* Drop all unfinished bitmaps */
|
|
for (item = s->bitmaps; item; item = g_slist_next(item)) {
|
|
LoadBitmapState *b = item->data;
|
|
|
|
/*
|
|
* Bitmap must be unfinished, as finished bitmaps should already be
|
|
* removed from the list.
|
|
*/
|
|
assert(!s->before_vm_start_handled || !b->migrated);
|
|
if (bdrv_dirty_bitmap_has_successor(b->bitmap)) {
|
|
bdrv_reclaim_dirty_bitmap(b->bitmap, &error_abort);
|
|
} else {
|
|
bdrv_dirty_bitmap_set_busy(b->bitmap, false);
|
|
}
|
|
bdrv_release_dirty_bitmap(b->bitmap);
|
|
}
|
|
|
|
g_slist_free_full(s->bitmaps, g_free);
|
|
s->bitmaps = NULL;
|
|
}
|
|
|
|
void dirty_bitmap_mig_cancel_outgoing(void)
|
|
{
|
|
dirty_bitmap_do_save_cleanup(&dbm_state.save);
|
|
}
|
|
|
|
void dirty_bitmap_mig_cancel_incoming(void)
|
|
{
|
|
DBMLoadState *s = &dbm_state.load;
|
|
|
|
qemu_mutex_lock(&s->lock);
|
|
|
|
cancel_incoming_locked(s);
|
|
|
|
qemu_mutex_unlock(&s->lock);
|
|
}
|
|
|
|
static void dirty_bitmap_load_complete(QEMUFile *f, DBMLoadState *s)
|
|
{
|
|
GSList *item;
|
|
trace_dirty_bitmap_load_complete();
|
|
|
|
if (s->cancelled) {
|
|
return;
|
|
}
|
|
|
|
bdrv_dirty_bitmap_deserialize_finish(s->bitmap);
|
|
|
|
if (bdrv_dirty_bitmap_has_successor(s->bitmap)) {
|
|
bdrv_reclaim_dirty_bitmap(s->bitmap, &error_abort);
|
|
} else {
|
|
bdrv_dirty_bitmap_set_busy(s->bitmap, false);
|
|
}
|
|
|
|
for (item = s->bitmaps; item; item = g_slist_next(item)) {
|
|
LoadBitmapState *b = item->data;
|
|
|
|
if (b->bitmap == s->bitmap) {
|
|
b->migrated = true;
|
|
if (s->before_vm_start_handled) {
|
|
s->bitmaps = g_slist_remove(s->bitmaps, b);
|
|
g_free(b);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int dirty_bitmap_load_bits(QEMUFile *f, DBMLoadState *s)
|
|
{
|
|
uint64_t first_byte = qemu_get_be64(f) << BDRV_SECTOR_BITS;
|
|
uint64_t nr_bytes = (uint64_t)qemu_get_be32(f) << BDRV_SECTOR_BITS;
|
|
trace_dirty_bitmap_load_bits_enter(first_byte >> BDRV_SECTOR_BITS,
|
|
nr_bytes >> BDRV_SECTOR_BITS);
|
|
|
|
if (s->flags & DIRTY_BITMAP_MIG_FLAG_ZEROES) {
|
|
trace_dirty_bitmap_load_bits_zeroes();
|
|
if (!s->cancelled) {
|
|
bdrv_dirty_bitmap_deserialize_zeroes(s->bitmap, first_byte,
|
|
nr_bytes, false);
|
|
}
|
|
} else {
|
|
size_t ret;
|
|
g_autofree uint8_t *buf = NULL;
|
|
uint64_t buf_size = qemu_get_be64(f);
|
|
uint64_t needed_size;
|
|
|
|
/*
|
|
* The actual check for buf_size is done a bit later. We can't do it in
|
|
* cancelled mode as we don't have the bitmap to check the constraints
|
|
* (so, we allocate a buffer and read prior to the check). On the other
|
|
* hand, we shouldn't blindly g_malloc the number from the stream.
|
|
* Actually one chunk should not be larger than CHUNK_SIZE. Let's allow
|
|
* a bit larger (which means that bitmap migration will fail anyway and
|
|
* the whole migration will most probably fail soon due to broken
|
|
* stream).
|
|
*/
|
|
if (buf_size > 10 * CHUNK_SIZE) {
|
|
error_report("Bitmap migration stream buffer allocation request "
|
|
"is too large");
|
|
return -EIO;
|
|
}
|
|
|
|
buf = g_malloc(buf_size);
|
|
ret = qemu_get_buffer(f, buf, buf_size);
|
|
if (ret != buf_size) {
|
|
error_report("Failed to read bitmap bits");
|
|
return -EIO;
|
|
}
|
|
|
|
if (s->cancelled) {
|
|
return 0;
|
|
}
|
|
|
|
needed_size = bdrv_dirty_bitmap_serialization_size(s->bitmap,
|
|
first_byte,
|
|
nr_bytes);
|
|
|
|
if (needed_size > buf_size ||
|
|
buf_size > QEMU_ALIGN_UP(needed_size, 4 * sizeof(long))
|
|
/* Here used same alignment as in send_bitmap_bits */
|
|
) {
|
|
error_report("Migrated bitmap granularity doesn't "
|
|
"match the destination bitmap '%s' granularity",
|
|
bdrv_dirty_bitmap_name(s->bitmap));
|
|
cancel_incoming_locked(s);
|
|
return 0;
|
|
}
|
|
|
|
bdrv_dirty_bitmap_deserialize_part(s->bitmap, buf, first_byte, nr_bytes,
|
|
false);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dirty_bitmap_load_header(QEMUFile *f, DBMLoadState *s,
|
|
GHashTable *alias_map)
|
|
{
|
|
GHashTable *bitmap_alias_map = NULL;
|
|
Error *local_err = NULL;
|
|
bool nothing;
|
|
s->flags = qemu_get_bitmap_flags(f);
|
|
trace_dirty_bitmap_load_header(s->flags);
|
|
|
|
nothing = s->flags == (s->flags & DIRTY_BITMAP_MIG_FLAG_EOS);
|
|
|
|
if (s->flags & DIRTY_BITMAP_MIG_FLAG_DEVICE_NAME) {
|
|
if (!qemu_get_counted_string(f, s->node_alias)) {
|
|
error_report("Unable to read node alias string");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!s->cancelled) {
|
|
if (alias_map) {
|
|
const AliasMapInnerNode *amin;
|
|
|
|
amin = g_hash_table_lookup(alias_map, s->node_alias);
|
|
if (!amin) {
|
|
error_setg(&local_err, "Error: Unknown node alias '%s'",
|
|
s->node_alias);
|
|
s->bs = NULL;
|
|
} else {
|
|
bitmap_alias_map = amin->subtree;
|
|
s->bs = bdrv_lookup_bs(NULL, amin->string, &local_err);
|
|
}
|
|
} else {
|
|
s->bs = bdrv_lookup_bs(s->node_alias, s->node_alias,
|
|
&local_err);
|
|
}
|
|
if (!s->bs) {
|
|
error_report_err(local_err);
|
|
cancel_incoming_locked(s);
|
|
}
|
|
}
|
|
} else if (s->bs) {
|
|
if (alias_map) {
|
|
const AliasMapInnerNode *amin;
|
|
|
|
/* Must be present in the map, or s->bs would not be set */
|
|
amin = g_hash_table_lookup(alias_map, s->node_alias);
|
|
assert(amin != NULL);
|
|
|
|
bitmap_alias_map = amin->subtree;
|
|
}
|
|
} else if (!nothing && !s->cancelled) {
|
|
error_report("Error: block device name is not set");
|
|
cancel_incoming_locked(s);
|
|
}
|
|
|
|
assert(nothing || s->cancelled || !!alias_map == !!bitmap_alias_map);
|
|
|
|
if (s->flags & DIRTY_BITMAP_MIG_FLAG_BITMAP_NAME) {
|
|
const char *bitmap_name;
|
|
|
|
if (!qemu_get_counted_string(f, s->bitmap_alias)) {
|
|
error_report("Unable to read bitmap alias string");
|
|
return -EINVAL;
|
|
}
|
|
|
|
bitmap_name = s->bitmap_alias;
|
|
if (!s->cancelled && bitmap_alias_map) {
|
|
BitmapMigrationBitmapAlias *bmap_inner;
|
|
|
|
bmap_inner = g_hash_table_lookup(bitmap_alias_map, s->bitmap_alias);
|
|
if (!bmap_inner) {
|
|
error_report("Error: Unknown bitmap alias '%s' on node "
|
|
"'%s' (alias '%s')", s->bitmap_alias,
|
|
s->bs->node_name, s->node_alias);
|
|
cancel_incoming_locked(s);
|
|
} else {
|
|
bitmap_name = bmap_inner->name;
|
|
}
|
|
|
|
s->bmap_inner = bmap_inner;
|
|
}
|
|
|
|
if (!s->cancelled) {
|
|
g_strlcpy(s->bitmap_name, bitmap_name, sizeof(s->bitmap_name));
|
|
s->bitmap = bdrv_find_dirty_bitmap(s->bs, s->bitmap_name);
|
|
|
|
/*
|
|
* bitmap may be NULL here, it wouldn't be an error if it is the
|
|
* first occurrence of the bitmap
|
|
*/
|
|
if (!s->bitmap && !(s->flags & DIRTY_BITMAP_MIG_FLAG_START)) {
|
|
error_report("Error: unknown dirty bitmap "
|
|
"'%s' for block device '%s'",
|
|
s->bitmap_name, s->bs->node_name);
|
|
cancel_incoming_locked(s);
|
|
}
|
|
}
|
|
} else if (!s->bitmap && !nothing && !s->cancelled) {
|
|
error_report("Error: block device name is not set");
|
|
cancel_incoming_locked(s);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* dirty_bitmap_load
|
|
*
|
|
* Load sequence of dirty bitmap chunks. Return error only on fatal io stream
|
|
* violations. On other errors just cancel bitmaps incoming migration and return
|
|
* 0.
|
|
*
|
|
* Note, than when incoming bitmap migration is canceled, we still must read all
|
|
* our chunks (and just ignore them), to not affect other migration objects.
|
|
*/
|
|
static int dirty_bitmap_load(QEMUFile *f, void *opaque, int version_id)
|
|
{
|
|
GHashTable *alias_map = NULL;
|
|
DBMLoadState *s = &((DBMState *)opaque)->load;
|
|
int ret = 0;
|
|
|
|
trace_dirty_bitmap_load_enter();
|
|
|
|
if (version_id != 1) {
|
|
QEMU_LOCK_GUARD(&s->lock);
|
|
cancel_incoming_locked(s);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (migrate_has_block_bitmap_mapping()) {
|
|
alias_map = construct_alias_map(migrate_block_bitmap_mapping(), false,
|
|
&error_abort);
|
|
}
|
|
|
|
do {
|
|
QEMU_LOCK_GUARD(&s->lock);
|
|
|
|
ret = dirty_bitmap_load_header(f, s, alias_map);
|
|
if (ret < 0) {
|
|
cancel_incoming_locked(s);
|
|
goto fail;
|
|
}
|
|
|
|
if (s->flags & DIRTY_BITMAP_MIG_FLAG_START) {
|
|
ret = dirty_bitmap_load_start(f, s);
|
|
} else if (s->flags & DIRTY_BITMAP_MIG_FLAG_COMPLETE) {
|
|
dirty_bitmap_load_complete(f, s);
|
|
} else if (s->flags & DIRTY_BITMAP_MIG_FLAG_BITS) {
|
|
ret = dirty_bitmap_load_bits(f, s);
|
|
}
|
|
|
|
if (!ret) {
|
|
ret = qemu_file_get_error(f);
|
|
}
|
|
|
|
if (ret) {
|
|
cancel_incoming_locked(s);
|
|
goto fail;
|
|
}
|
|
} while (!(s->flags & DIRTY_BITMAP_MIG_FLAG_EOS));
|
|
|
|
trace_dirty_bitmap_load_success();
|
|
ret = 0;
|
|
fail:
|
|
if (alias_map) {
|
|
g_hash_table_destroy(alias_map);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int dirty_bitmap_save_setup(QEMUFile *f, void *opaque, Error **errp)
|
|
{
|
|
DBMSaveState *s = &((DBMState *)opaque)->save;
|
|
SaveBitmapState *dbms = NULL;
|
|
|
|
if (init_dirty_bitmap_migration(s) < 0) {
|
|
error_setg(errp,
|
|
"Failed to initialize dirty tracking bitmap for blocks");
|
|
return -1;
|
|
}
|
|
|
|
QSIMPLEQ_FOREACH(dbms, &s->dbms_list, entry) {
|
|
send_bitmap_start(f, s, dbms);
|
|
}
|
|
qemu_put_bitmap_flags(f, DIRTY_BITMAP_MIG_FLAG_EOS);
|
|
return 0;
|
|
}
|
|
|
|
static bool dirty_bitmap_is_active(void *opaque)
|
|
{
|
|
DBMSaveState *s = &((DBMState *)opaque)->save;
|
|
|
|
return migrate_dirty_bitmaps() && !s->no_bitmaps;
|
|
}
|
|
|
|
static bool dirty_bitmap_is_active_iterate(void *opaque)
|
|
{
|
|
return dirty_bitmap_is_active(opaque) && !runstate_is_running();
|
|
}
|
|
|
|
static bool dirty_bitmap_has_postcopy(void *opaque)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static SaveVMHandlers savevm_dirty_bitmap_handlers = {
|
|
.save_setup = dirty_bitmap_save_setup,
|
|
.save_live_complete_postcopy = dirty_bitmap_save_complete,
|
|
.save_live_complete_precopy = dirty_bitmap_save_complete,
|
|
.has_postcopy = dirty_bitmap_has_postcopy,
|
|
.state_pending_exact = dirty_bitmap_state_pending,
|
|
.state_pending_estimate = dirty_bitmap_state_pending,
|
|
.save_live_iterate = dirty_bitmap_save_iterate,
|
|
.is_active_iterate = dirty_bitmap_is_active_iterate,
|
|
.load_state = dirty_bitmap_load,
|
|
.save_cleanup = dirty_bitmap_save_cleanup,
|
|
.is_active = dirty_bitmap_is_active,
|
|
};
|
|
|
|
void dirty_bitmap_mig_init(void)
|
|
{
|
|
QSIMPLEQ_INIT(&dbm_state.save.dbms_list);
|
|
qemu_mutex_init(&dbm_state.load.lock);
|
|
|
|
register_savevm_live("dirty-bitmap", 0, 1,
|
|
&savevm_dirty_bitmap_handlers,
|
|
&dbm_state);
|
|
}
|