@@ -508,6 +508,44 @@
'data': [ 'none', 'zlib',
{ 'name': 'zstd', 'if': 'defined(CONFIG_ZSTD)' } ] }
+##
+# @BitmapMigrationBitmapAlias:
+#
+# @name: The name of the bitmap.
+#
+# @alias: An alias name for migration (for example the bitmap name on
+# the opposite site).
+#
+# Since: 5.2
+##
+{ 'struct': 'BitmapMigrationBitmapAlias',
+ 'data': {
+ 'name': 'str',
+ 'alias': 'str'
+ } }
+
+##
+# @BitmapMigrationNodeAlias:
+#
+# Maps a block node name and the bitmaps it has to aliases for dirty
+# bitmap migration.
+#
+# @node-name: A block node name.
+#
+# @alias: An alias block node name for migration (for example the
+# node name on the opposite site).
+#
+# @bitmaps: Mappings for the bitmaps on this node.
+#
+# Since: 5.2
+##
+{ 'struct': 'BitmapMigrationNodeAlias',
+ 'data': {
+ 'node-name': 'str',
+ 'alias': 'str',
+ 'bitmaps': [ 'BitmapMigrationBitmapAlias' ]
+ } }
+
##
# @MigrationParameter:
#
@@ -642,6 +680,25 @@
# will consume more CPU.
# Defaults to 1. (Since 5.0)
#
+# @block-bitmap-mapping: Maps block nodes and bitmaps on them to
+# aliases for the purpose of dirty bitmap migration. Such
+# aliases may for example be the corresponding names on the
+# opposite site.
+# The mapping must be one-to-one, but not necessarily
+# complete: On the source, unmapped bitmaps and all bitmaps
+# on unmapped nodes will be ignored. On the destination,
+# encountering an unmapped alias in the incoming migration
+# stream will result in a report, and all further bitmap
+# migration data will then be discarded.
+# Note that the destination does not know about bitmaps it
+# does not receive, so there is no limitation or requirement
+# regarding the number of bitmaps received, or how they are
+# named, or on which nodes they are placed.
+# By default (when this parameter has never been set), bitmap
+# names are mapped to themselves. Nodes are mapped to their
+# block device name if there is one, and to their node name
+# otherwise. (Since 5.2)
+#
# Since: 2.4
##
{ 'enum': 'MigrationParameter',
@@ -656,7 +713,8 @@
'multifd-channels',
'xbzrle-cache-size', 'max-postcopy-bandwidth',
'max-cpu-throttle', 'multifd-compression',
- 'multifd-zlib-level' ,'multifd-zstd-level' ] }
+ 'multifd-zlib-level' ,'multifd-zstd-level',
+ 'block-bitmap-mapping' ] }
##
# @MigrateSetParameters:
@@ -782,6 +840,25 @@
# will consume more CPU.
# Defaults to 1. (Since 5.0)
#
+# @block-bitmap-mapping: Maps block nodes and bitmaps on them to
+# aliases for the purpose of dirty bitmap migration. Such
+# aliases may for example be the corresponding names on the
+# opposite site.
+# The mapping must be one-to-one, but not necessarily
+# complete: On the source, unmapped bitmaps and all bitmaps
+# on unmapped nodes will be ignored. On the destination,
+# encountering an unmapped alias in the incoming migration
+# stream will result in a report, and all further bitmap
+# migration data will then be discarded.
+# Note that the destination does not know about bitmaps it
+# does not receive, so there is no limitation or requirement
+# regarding the number of bitmaps received, or how they are
+# named, or on which nodes they are placed.
+# By default (when this parameter has never been set), bitmap
+# names are mapped to themselves. Nodes are mapped to their
+# block device name if there is one, and to their node name
+# otherwise. (Since 5.2)
+#
# Since: 2.4
##
# TODO either fuse back into MigrationParameters, or make
@@ -812,7 +889,8 @@
'*max-cpu-throttle': 'int',
'*multifd-compression': 'MultiFDCompression',
'*multifd-zlib-level': 'int',
- '*multifd-zstd-level': 'int' } }
+ '*multifd-zstd-level': 'int',
+ '*block-bitmap-mapping': [ 'BitmapMigrationNodeAlias' ] } }
##
# @migrate-set-parameters:
@@ -958,6 +1036,25 @@
# will consume more CPU.
# Defaults to 1. (Since 5.0)
#
+# @block-bitmap-mapping: Maps block nodes and bitmaps on them to
+# aliases for the purpose of dirty bitmap migration. Such
+# aliases may for example be the corresponding names on the
+# opposite site.
+# The mapping must be one-to-one, but not necessarily
+# complete: On the source, unmapped bitmaps and all bitmaps
+# on unmapped nodes will be ignored. On the destination,
+# encountering an unmapped alias in the incoming migration
+# stream will result in a report, and all further bitmap
+# migration data will then be discarded.
+# Note that the destination does not know about bitmaps it
+# does not receive, so there is no limitation or requirement
+# regarding the number of bitmaps received, or how they are
+# named, or on which nodes they are placed.
+# By default (when this parameter has never been set), bitmap
+# names are mapped to themselves. Nodes are mapped to their
+# block device name if there is one, and to their node name
+# otherwise. (Since 5.2)
+#
# Since: 2.4
##
{ 'struct': 'MigrationParameters',
@@ -986,7 +1083,8 @@
'*max-cpu-throttle': 'uint8',
'*multifd-compression': 'MultiFDCompression',
'*multifd-zlib-level': 'uint8',
- '*multifd-zstd-level': 'uint8' } }
+ '*multifd-zstd-level': 'uint8',
+ '*block-bitmap-mapping': [ 'BitmapMigrationNodeAlias' ] } }
##
# @query-migrate-parameters:
@@ -337,6 +337,9 @@ void migrate_send_rp_resume_ack(MigrationIncomingState *mis, uint32_t value);
void dirty_bitmap_mig_before_vm_start(void);
void dirty_bitmap_mig_cancel_outgoing(void);
void dirty_bitmap_mig_cancel_incoming(void);
+bool check_dirty_bitmap_mig_alias_map(const BitmapMigrationNodeAliasList *bbm,
+ Error **errp);
+
void migrate_add_address(SocketAddress *address);
int foreach_not_ignored_block(RAMBlockIterFunc func, void *opaque);
@@ -29,10 +29,10 @@
*
* # Header (shared for different chunk types)
* 1, 2 or 4 bytes: flags (see qemu_{put,put}_flags)
- * [ 1 byte: node name size ] \ flags & DEVICE_NAME
- * [ n bytes: node name ] /
- * [ 1 byte: bitmap name size ] \ flags & BITMAP_NAME
- * [ n bytes: bitmap name ] /
+ * [ 1 byte: node alias size ] \ flags & DEVICE_NAME
+ * [ n bytes: node alias ] /
+ * [ 1 byte: bitmap alias size ] \ flags & BITMAP_NAME
+ * [ n bytes: bitmap alias ] /
*
* # Start of bitmap migration (flags & START)
* header
@@ -72,7 +72,9 @@
#include "migration/register.h"
#include "qemu/hbitmap.h"
#include "qemu/cutils.h"
+#include "qemu/id.h"
#include "qapi/error.h"
+#include "qapi/qapi-commands-migration.h"
#include "trace.h"
#define CHUNK_SIZE (1 << 10)
@@ -104,7 +106,8 @@
typedef struct SaveBitmapState {
/* Written during setup phase. */
BlockDriverState *bs;
- const char *node_name;
+ char *node_alias;
+ char *bitmap_alias;
BdrvDirtyBitmap *bitmap;
uint64_t total_sectors;
uint64_t sectors_per_chunk;
@@ -138,8 +141,9 @@ typedef struct LoadBitmapState {
/* State of the dirty bitmap migration (DBM) during load process */
typedef struct DBMLoadState {
uint32_t flags;
- char node_name[256];
- char bitmap_name[256];
+ char node_alias[256];
+ char bitmap_alias[256];
+ char bitmap_name[BDRV_BITMAP_MAX_NAME_SIZE + 1];
BlockDriverState *bs;
BdrvDirtyBitmap *bitmap;
@@ -165,6 +169,188 @@ typedef struct DBMState {
static DBMState dbm_state;
+/* For hash tables that map node/bitmap names to aliases */
+typedef struct AliasMapInnerNode {
+ char *string;
+ GHashTable *subtree;
+} AliasMapInnerNode;
+
+static void free_alias_map_inner_node(void *amin_ptr)
+{
+ AliasMapInnerNode *amin = amin_ptr;
+
+ g_free(amin->string);
+ g_hash_table_unref(amin->subtree);
+ g_free(amin);
+}
+
+/**
+ * Construct an alias map based on the given QMP structure.
+ *
+ * (Note that we cannot store such maps in the MigrationParameters
+ * object, because that struct is defined by the QAPI schema, which
+ * makes it basically impossible to have dicts with arbitrary keys.
+ * Therefore, we instead have to construct these maps when migration
+ * starts.)
+ *
+ * @bbm is the block_bitmap_mapping from the migration parameters.
+ *
+ * If @name_to_alias is true, the returned hash table will map node
+ * and bitmap names to their respective aliases (for outgoing
+ * migration).
+ *
+ * If @name_to_alias is false, the returned hash table will map node
+ * and bitmap aliases to their respective names (for incoming
+ * migration).
+ *
+ * The hash table maps node names/aliases to AliasMapInnerNode
+ * objects, whose .string is the respective node alias/name, and whose
+ * .subtree table maps bitmap names/aliases to the respective bitmap
+ * alias/name.
+ */
+static GHashTable *construct_alias_map(const BitmapMigrationNodeAliasList *bbm,
+ bool name_to_alias,
+ Error **errp)
+{
+ GHashTable *alias_map;
+ size_t max_node_name_len = sizeof_field(BlockDriverState, node_name) - 1;
+
+ alias_map = g_hash_table_new_full(g_str_hash, g_str_equal,
+ g_free, free_alias_map_inner_node);
+
+ for (; bbm; bbm = bbm->next) {
+ const BitmapMigrationNodeAlias *bmna = bbm->value;
+ const BitmapMigrationBitmapAliasList *bmbal;
+ AliasMapInnerNode *amin;
+ GHashTable *bitmaps_map;
+ const char *node_map_from, *node_map_to;
+
+ if (!id_wellformed(bmna->alias)) {
+ error_setg(errp, "The node alias '%s' is not well-formed",
+ bmna->alias);
+ goto fail;
+ }
+
+ if (strlen(bmna->alias) > UINT8_MAX) {
+ error_setg(errp, "The node alias '%s' is longer than %u bytes",
+ bmna->alias, UINT8_MAX);
+ goto fail;
+ }
+
+ if (strlen(bmna->node_name) > max_node_name_len) {
+ error_setg(errp, "The node name '%s' is longer than %zu bytes",
+ bmna->node_name, max_node_name_len);
+ goto fail;
+ }
+
+ if (name_to_alias) {
+ if (g_hash_table_contains(alias_map, bmna->node_name)) {
+ error_setg(errp, "The node name '%s' is mapped twice",
+ bmna->node_name);
+ goto fail;
+ }
+
+ node_map_from = bmna->node_name;
+ node_map_to = bmna->alias;
+ } else {
+ if (g_hash_table_contains(alias_map, bmna->alias)) {
+ error_setg(errp, "The node alias '%s' is used twice",
+ bmna->alias);
+ goto fail;
+ }
+
+ node_map_from = bmna->alias;
+ node_map_to = bmna->node_name;
+ }
+
+ bitmaps_map = g_hash_table_new_full(g_str_hash, g_str_equal,
+ g_free, g_free);
+
+ amin = g_new(AliasMapInnerNode, 1);
+ *amin = (AliasMapInnerNode){
+ .string = g_strdup(node_map_to),
+ .subtree = bitmaps_map,
+ };
+
+ g_hash_table_insert(alias_map, g_strdup(node_map_from), amin);
+
+ for (bmbal = bmna->bitmaps; bmbal; bmbal = bmbal->next) {
+ const BitmapMigrationBitmapAlias *bmba = bmbal->value;
+ const char *bmap_map_from, *bmap_map_to;
+
+ if (strlen(bmba->alias) > UINT8_MAX) {
+ error_setg(errp,
+ "The bitmap alias '%s' is longer than %u bytes",
+ bmba->alias, UINT8_MAX);
+ goto fail;
+ }
+
+ if (strlen(bmba->name) > BDRV_BITMAP_MAX_NAME_SIZE) {
+ error_setg(errp, "The bitmap name '%s' is longer than %d bytes",
+ bmba->name, BDRV_BITMAP_MAX_NAME_SIZE);
+ goto fail;
+ }
+
+ if (name_to_alias) {
+ bmap_map_from = bmba->name;
+ bmap_map_to = bmba->alias;
+
+ if (g_hash_table_contains(bitmaps_map, bmba->name)) {
+ error_setg(errp, "The bitmap '%s'/'%s' is mapped twice",
+ bmna->node_name, bmba->name);
+ goto fail;
+ }
+ } else {
+ bmap_map_from = bmba->alias;
+ bmap_map_to = bmba->name;
+
+ if (g_hash_table_contains(bitmaps_map, bmba->alias)) {
+ error_setg(errp, "The bitmap alias '%s'/'%s' is used twice",
+ bmna->alias, bmba->alias);
+ goto fail;
+ }
+ }
+
+ g_hash_table_insert(bitmaps_map,
+ g_strdup(bmap_map_from), g_strdup(bmap_map_to));
+ }
+ }
+
+ return alias_map;
+
+fail:
+ g_hash_table_destroy(alias_map);
+ return NULL;
+}
+
+/**
+ * Run construct_alias_map() in both directions to check whether @bbm
+ * is valid.
+ * (This function is to be used by migration/migration.c to validate
+ * the user-specified block-bitmap-mapping migration parameter.)
+ *
+ * Returns true if and only if the mapping is valid.
+ */
+bool check_dirty_bitmap_mig_alias_map(const BitmapMigrationNodeAliasList *bbm,
+ Error **errp)
+{
+ GHashTable *alias_map;
+
+ alias_map = construct_alias_map(bbm, true, errp);
+ if (!alias_map) {
+ return false;
+ }
+ g_hash_table_destroy(alias_map);
+
+ alias_map = construct_alias_map(bbm, false, errp);
+ if (!alias_map) {
+ return false;
+ }
+ g_hash_table_destroy(alias_map);
+
+ return true;
+}
+
static uint32_t qemu_get_bitmap_flags(QEMUFile *f)
{
uint8_t flags = qemu_get_byte(f);
@@ -207,11 +393,11 @@ static void send_bitmap_header(QEMUFile *f, DBMSaveState *s,
qemu_put_bitmap_flags(f, flags);
if (flags & DIRTY_BITMAP_MIG_FLAG_DEVICE_NAME) {
- qemu_put_counted_string(f, dbms->node_name);
+ qemu_put_counted_string(f, dbms->node_alias);
}
if (flags & DIRTY_BITMAP_MIG_FLAG_BITMAP_NAME) {
- qemu_put_counted_string(f, bdrv_dirty_bitmap_name(bitmap));
+ qemu_put_counted_string(f, dbms->bitmap_alias);
}
}
@@ -282,18 +468,25 @@ static void dirty_bitmap_do_save_cleanup(DBMSaveState *s)
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 iothread lock taken. */
static int add_bitmaps_to_list(DBMSaveState *s, BlockDriverState *bs,
- const char *bs_name)
+ 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;
@@ -303,21 +496,39 @@ static int add_bitmaps_to_list(DBMSaveState *s, BlockDriverState *bs,
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",
- bdrv_dirty_bitmap_name(bitmap));
+ bitmap_name);
return -1;
}
- if (bs_name[0] == '#') {
+ 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",
- bdrv_dirty_bitmap_name(bitmap), bs_name);
+ bitmap_name, node_alias);
return -1;
}
FOR_EACH_DIRTY_BITMAP(bs, bitmap) {
- if (!bdrv_dirty_bitmap_name(bitmap)) {
+ bitmap_name = bdrv_dirty_bitmap_name(bitmap);
+ if (!bitmap_name) {
continue;
}
@@ -326,12 +537,29 @@ static int add_bitmaps_to_list(DBMSaveState *s, BlockDriverState *bs,
return -1;
}
+ if (bitmap_aliases) {
+ bitmap_alias = g_hash_table_lookup(bitmap_aliases, bitmap_name);
+ if (!bitmap_alias) {
+ /* Skip bitmaps with no alias */
+ continue;
+ }
+ } 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_name = bs_name;
+ 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 * 8 *
@@ -356,43 +584,52 @@ static int init_dirty_bitmap_migration(DBMSaveState *s)
SaveBitmapState *dbms;
GHashTable *handled_by_blk = g_hash_table_new(NULL, NULL);
BlockBackend *blk;
+ const MigrationParameters *mig_params = &migrate_get_current()->parameters;
+ GHashTable *alias_map = NULL;
+
+ if (mig_params->has_block_bitmap_mapping) {
+ alias_map = construct_alias_map(mig_params->block_bitmap_mapping, true,
+ &error_abort);
+ }
s->bulk_completed = false;
s->prev_bs = NULL;
s->prev_bitmap = NULL;
s->no_bitmaps = false;
- /*
- * 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 (!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;
- }
+ if (!name || strcmp(name, "") == 0) {
+ continue;
+ }
- bs = blk_bs(blk);
+ bs = blk_bs(blk);
- /* Skip filters without bitmaps */
- while (bs && bs->drv && bs->drv->is_filter &&
- !bdrv_has_named_bitmaps(bs))
- {
- if (bs->backing) {
- bs = bs->backing->bs;
- } else if (bs->file) {
- bs = bs->file->bs;
- } else {
- bs = NULL;
+ /* Skip filters without bitmaps */
+ while (bs && bs->drv && bs->drv->is_filter &&
+ !bdrv_has_named_bitmaps(bs))
+ {
+ if (bs->backing) {
+ bs = bs->backing->bs;
+ } else if (bs->file) {
+ bs = bs->file->bs;
+ } else {
+ bs = NULL;
+ }
}
- }
- if (bs && bs->drv && !bs->drv->is_filter) {
- if (add_bitmaps_to_list(s, bs, name)) {
- goto fail;
+ 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);
}
- g_hash_table_add(handled_by_blk, bs);
}
}
@@ -401,7 +638,7 @@ static int init_dirty_bitmap_migration(DBMSaveState *s)
continue;
}
- if (add_bitmaps_to_list(s, bs, bdrv_get_node_name(bs))) {
+ if (add_bitmaps_to_list(s, bs, bdrv_get_node_name(bs), alias_map)) {
goto fail;
}
}
@@ -416,11 +653,17 @@ static int init_dirty_bitmap_migration(DBMSaveState *s)
}
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;
@@ -770,8 +1013,10 @@ static int dirty_bitmap_load_bits(QEMUFile *f, DBMLoadState *s)
return 0;
}
-static int dirty_bitmap_load_header(QEMUFile *f, DBMLoadState *s)
+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);
@@ -780,28 +1025,75 @@ static int dirty_bitmap_load_header(QEMUFile *f, DBMLoadState *s)
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_name)) {
- error_report("Unable to read node name string");
+ if (!qemu_get_counted_string(f, s->node_alias)) {
+ error_report("Unable to read node alias string");
return -EINVAL;
}
+
if (!s->cancelled) {
- s->bs = bdrv_lookup_bs(s->node_name, s->node_name, &local_err);
+ 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 && !nothing && !s->cancelled) {
+ } 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) {
- if (!qemu_get_counted_string(f, s->bitmap_name)) {
- error_report("Unable to read bitmap name string");
+ const char *bitmap_name;
+
+ if (!qemu_get_counted_string(f, s->bitmap_alias)) {
+ error_report("Unable to read bitmap alias string");
return -EINVAL;
}
+
if (!s->cancelled) {
+ if (bitmap_alias_map) {
+ bitmap_name = g_hash_table_lookup(bitmap_alias_map,
+ s->bitmap_alias);
+ if (!bitmap_name) {
+ 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 = s->bitmap_alias;
+ }
+ }
+
+ 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);
/*
@@ -811,7 +1103,7 @@ static int dirty_bitmap_load_header(QEMUFile *f, DBMLoadState *s)
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->node_name);
+ s->bitmap_name, s->bs->node_name);
cancel_incoming_locked(s);
}
}
@@ -835,6 +1127,8 @@ static int dirty_bitmap_load_header(QEMUFile *f, DBMLoadState *s)
*/
static int dirty_bitmap_load(QEMUFile *f, void *opaque, int version_id)
{
+ GHashTable *alias_map = NULL;
+ const MigrationParameters *mig_params = &migrate_get_current()->parameters;
DBMLoadState *s = &((DBMState *)opaque)->load;
int ret = 0;
@@ -846,13 +1140,18 @@ static int dirty_bitmap_load(QEMUFile *f, void *opaque, int version_id)
return -EINVAL;
}
+ if (mig_params->has_block_bitmap_mapping) {
+ alias_map = construct_alias_map(mig_params->block_bitmap_mapping,
+ false, &error_abort);
+ }
+
do {
QEMU_LOCK_GUARD(&s->lock);
- ret = dirty_bitmap_load_header(f, s);
+ ret = dirty_bitmap_load_header(f, s, alias_map);
if (ret < 0) {
cancel_incoming_locked(s);
- return ret;
+ goto fail;
}
if (s->flags & DIRTY_BITMAP_MIG_FLAG_START) {
@@ -869,12 +1168,17 @@ static int dirty_bitmap_load(QEMUFile *f, void *opaque, int version_id)
if (ret) {
cancel_incoming_locked(s);
- return ret;
+ goto fail;
}
} while (!(s->flags & DIRTY_BITMAP_MIG_FLAG_EOS));
trace_dirty_bitmap_load_success();
- return 0;
+ ret = 0;
+fail:
+ if (alias_map) {
+ g_hash_table_destroy(alias_map);
+ }
+ return ret;
}
static int dirty_bitmap_save_setup(QEMUFile *f, void *opaque)
@@ -36,6 +36,7 @@
#include "block/block.h"
#include "qapi/error.h"
#include "qapi/clone-visitor.h"
+#include "qapi/qapi-visit-migration.h"
#include "qapi/qapi-visit-sockets.h"
#include "qapi/qapi-commands-migration.h"
#include "qapi/qapi-events-migration.h"
@@ -843,6 +844,13 @@ MigrationParameters *qmp_query_migrate_parameters(Error **errp)
params->has_announce_step = true;
params->announce_step = s->parameters.announce_step;
+ if (s->parameters.has_block_bitmap_mapping) {
+ params->has_block_bitmap_mapping = true;
+ params->block_bitmap_mapping =
+ QAPI_CLONE(BitmapMigrationNodeAliasList,
+ s->parameters.block_bitmap_mapping);
+ }
+
return params;
}
@@ -1308,6 +1316,13 @@ static bool migrate_params_check(MigrationParameters *params, Error **errp)
"is invalid, it must be in the range of 1 to 10000 ms");
return false;
}
+
+ if (params->has_block_bitmap_mapping &&
+ !check_dirty_bitmap_mig_alias_map(params->block_bitmap_mapping, errp)) {
+ error_prepend(errp, "Invalid mapping given for block-bitmap-mapping: ");
+ return false;
+ }
+
return true;
}
@@ -1402,6 +1417,11 @@ static void migrate_params_test_apply(MigrateSetParameters *params,
if (params->has_announce_step) {
dest->announce_step = params->announce_step;
}
+
+ if (params->has_block_bitmap_mapping) {
+ dest->has_block_bitmap_mapping = true;
+ dest->block_bitmap_mapping = params->block_bitmap_mapping;
+ }
}
static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
@@ -1514,6 +1534,16 @@ static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
if (params->has_announce_step) {
s->parameters.announce_step = params->announce_step;
}
+
+ if (params->has_block_bitmap_mapping) {
+ qapi_free_BitmapMigrationNodeAliasList(
+ s->parameters.block_bitmap_mapping);
+
+ s->parameters.has_block_bitmap_mapping = true;
+ s->parameters.block_bitmap_mapping =
+ QAPI_CLONE(BitmapMigrationNodeAliasList,
+ params->block_bitmap_mapping);
+ }
}
void qmp_migrate_set_parameters(MigrateSetParameters *params, Error **errp)
@@ -469,6 +469,32 @@ void hmp_info_migrate_parameters(Monitor *mon, const QDict *qdict)
monitor_printf(mon, "%s: '%s'\n",
MigrationParameter_str(MIGRATION_PARAMETER_TLS_AUTHZ),
params->tls_authz);
+
+ if (params->has_block_bitmap_mapping) {
+ const BitmapMigrationNodeAliasList *bmnal;
+
+ monitor_printf(mon, "%s:\n",
+ MigrationParameter_str(
+ MIGRATION_PARAMETER_BLOCK_BITMAP_MAPPING));
+
+ for (bmnal = params->block_bitmap_mapping;
+ bmnal;
+ bmnal = bmnal->next)
+ {
+ const BitmapMigrationNodeAlias *bmna = bmnal->value;
+ const BitmapMigrationBitmapAliasList *bmbal;
+
+ monitor_printf(mon, " '%s' -> '%s'\n",
+ bmna->node_name, bmna->alias);
+
+ for (bmbal = bmna->bitmaps; bmbal; bmbal = bmbal->next) {
+ const BitmapMigrationBitmapAlias *bmba = bmbal->value;
+
+ monitor_printf(mon, " '%s' -> '%s'\n",
+ bmba->name, bmba->alias);
+ }
+ }
+ }
}
qapi_free_MigrationParameters(params);
@@ -1384,6 +1410,10 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict)
p->has_announce_step = true;
visit_type_size(v, param, &p->announce_step, &err);
break;
+ case MIGRATION_PARAMETER_BLOCK_BITMAP_MAPPING:
+ error_setg(&err, "The block-bitmap-mapping parameter can only be set "
+ "through QMP");
+ break;
default:
assert(0);
}