* [PATCH v5 1/3] migration: Add block-bitmap-mapping parameter
2020-08-20 15:07 [PATCH v5 0/3] migration: Add block-bitmap-mapping parameter Max Reitz
@ 2020-08-20 15:07 ` Max Reitz
2020-08-20 15:56 ` Vladimir Sementsov-Ogievskiy
2020-08-21 0:37 ` Eric Blake
2020-08-20 15:07 ` [PATCH v5 2/3] iotests.py: Let wait_migration() return on failure Max Reitz
2020-08-20 15:07 ` [PATCH v5 3/3] iotests: Test node/bitmap aliases during migration Max Reitz
2 siblings, 2 replies; 8+ messages in thread
From: Max Reitz @ 2020-08-20 15:07 UTC (permalink / raw)
To: qemu-block
Cc: Kevin Wolf, Vladimir Sementsov-Ogievskiy, Juan Quintela,
John Snow, qemu-devel, Dr . David Alan Gilbert, Peter Krempa,
Max Reitz
This migration parameter allows mapping block node names and bitmap
names to aliases for the purpose of block dirty bitmap migration.
This way, management tools can use different node and bitmap names on
the source and destination and pass the mapping of how bitmaps are to be
transferred to qemu (on the source, the destination, or even both with
arbitrary aliases in the migration stream).
While touching this code, fix a bug where bitmap names longer than 255
bytes would fail an assertion in qemu_put_counted_string().
Suggested-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
---
qapi/migration.json | 104 ++++++++-
migration/migration.h | 3 +
migration/block-dirty-bitmap.c | 412 ++++++++++++++++++++++++++++-----
migration/migration.c | 30 +++
monitor/hmp-cmds.c | 30 +++
5 files changed, 522 insertions(+), 57 deletions(-)
diff --git a/qapi/migration.json b/qapi/migration.json
index ea53b23dca..5f6b06172c 100644
--- a/qapi/migration.json
+++ b/qapi/migration.json
@@ -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:
diff --git a/migration/migration.h b/migration/migration.h
index 6c6a931d0d..2ed55c4aef 100644
--- a/migration/migration.h
+++ b/migration/migration.h
@@ -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);
diff --git a/migration/block-dirty-bitmap.c b/migration/block-dirty-bitmap.c
index 784330ebe1..549e14daba 100644
--- a/migration/block-dirty-bitmap.c
+++ b/migration/block-dirty-bitmap.c
@@ -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 (!name || strcmp(name, "") == 0) {
- continue;
- }
+ 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);
- bs = blk_bs(blk);
+ if (!name || strcmp(name, "") == 0) {
+ continue;
+ }
- /* 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;
+ 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;
+ }
}
- }
- 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)
diff --git a/migration/migration.c b/migration/migration.c
index 8fe36339db..dbd4afa1e8 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -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)
diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
index ae4b6a4246..7711726fd2 100644
--- a/monitor/hmp-cmds.c
+++ b/monitor/hmp-cmds.c
@@ -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);
}
--
2.26.2
^ permalink raw reply related [flat|nested] 8+ messages in thread* [PATCH v5 3/3] iotests: Test node/bitmap aliases during migration
2020-08-20 15:07 [PATCH v5 0/3] migration: Add block-bitmap-mapping parameter Max Reitz
2020-08-20 15:07 ` [PATCH v5 1/3] " Max Reitz
2020-08-20 15:07 ` [PATCH v5 2/3] iotests.py: Let wait_migration() return on failure Max Reitz
@ 2020-08-20 15:07 ` Max Reitz
2020-08-20 16:01 ` Vladimir Sementsov-Ogievskiy
2020-08-21 0:39 ` Eric Blake
2 siblings, 2 replies; 8+ messages in thread
From: Max Reitz @ 2020-08-20 15:07 UTC (permalink / raw)
To: qemu-block
Cc: Kevin Wolf, Vladimir Sementsov-Ogievskiy, Juan Quintela,
John Snow, qemu-devel, Dr . David Alan Gilbert, Peter Krempa,
Max Reitz
Signed-off-by: Max Reitz <mreitz@redhat.com>
---
tests/qemu-iotests/300 | 595 +++++++++++++++++++++++++++++++++++++
tests/qemu-iotests/300.out | 5 +
tests/qemu-iotests/group | 1 +
3 files changed, 601 insertions(+)
create mode 100755 tests/qemu-iotests/300
create mode 100644 tests/qemu-iotests/300.out
diff --git a/tests/qemu-iotests/300 b/tests/qemu-iotests/300
new file mode 100755
index 0000000000..face67bf7f
--- /dev/null
+++ b/tests/qemu-iotests/300
@@ -0,0 +1,595 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2020 Red Hat, Inc.
+#
+# Tests for dirty bitmaps migration with node aliases
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+import os
+import random
+import re
+import time
+from typing import Dict, List, Optional, Union
+import iotests
+import qemu
+
+BlockBitmapMapping = List[Dict[str, Union[str, List[Dict[str, str]]]]]
+
+assert iotests.sock_dir is not None
+mig_sock = os.path.join(iotests.sock_dir, 'mig_sock')
+
+class TestDirtyBitmapMigration(iotests.QMPTestCase):
+ src_node_name: str = ''
+ dst_node_name: str = ''
+ src_bmap_name: str = ''
+ dst_bmap_name: str = ''
+
+ def setUp(self) -> None:
+ self.vm_a = iotests.VM(path_suffix='-a')
+ self.vm_a.add_blockdev(f'node-name={self.src_node_name},' \
+ 'driver=null-co')
+ self.vm_a.launch()
+
+ self.vm_b = iotests.VM(path_suffix='-b')
+ self.vm_b.add_blockdev(f'node-name={self.dst_node_name},' \
+ 'driver=null-co')
+ self.vm_b.add_incoming(f'unix:{mig_sock}')
+ self.vm_b.launch()
+
+ result = self.vm_a.qmp('block-dirty-bitmap-add',
+ node=self.src_node_name,
+ name=self.src_bmap_name)
+ self.assert_qmp(result, 'return', {})
+
+ # Dirty some random megabytes
+ for _ in range(9):
+ mb_ofs = random.randrange(1024)
+ self.vm_a.hmp_qemu_io(self.src_node_name, f'discard {mb_ofs}M 1M')
+
+ result = self.vm_a.qmp('x-debug-block-dirty-bitmap-sha256',
+ node=self.src_node_name,
+ name=self.src_bmap_name)
+ self.bitmap_hash_reference = result['return']['sha256']
+
+ caps = [{'capability': name, 'state': True} \
+ for name in ('dirty-bitmaps', 'events')]
+
+ for vm in (self.vm_a, self.vm_b):
+ result = vm.qmp('migrate-set-capabilities', capabilities=caps)
+ self.assert_qmp(result, 'return', {})
+
+ def tearDown(self) -> None:
+ self.vm_a.shutdown()
+ self.vm_b.shutdown()
+ try:
+ os.remove(mig_sock)
+ except OSError:
+ pass
+
+ def check_bitmap(self, bitmap_name_valid: bool) -> None:
+ result = self.vm_b.qmp('x-debug-block-dirty-bitmap-sha256',
+ node=self.dst_node_name,
+ name=self.dst_bmap_name)
+ if bitmap_name_valid:
+ self.assert_qmp(result, 'return/sha256',
+ self.bitmap_hash_reference)
+ else:
+ self.assert_qmp(result, 'error/desc',
+ f"Dirty bitmap '{self.dst_bmap_name}' not found")
+
+ def migrate(self, bitmap_name_valid: bool = True,
+ migration_success: bool = True) -> None:
+ result = self.vm_a.qmp('migrate', uri=f'unix:{mig_sock}')
+ self.assert_qmp(result, 'return', {})
+
+ with iotests.Timeout(5, 'Timeout waiting for migration to complete'):
+ self.assertEqual(self.vm_a.wait_migration('postmigrate'),
+ migration_success)
+ self.assertEqual(self.vm_b.wait_migration('running'),
+ migration_success)
+
+ if migration_success:
+ self.check_bitmap(bitmap_name_valid)
+
+ def verify_dest_error(self, msg: Optional[str]) -> None:
+ """
+ Check whether the given error message is present in vm_b's log.
+ (vm_b is shut down to do so.)
+ If @msg is None, check that there has not been any error.
+ """
+ self.vm_b.shutdown()
+ if msg is None:
+ self.assertNotIn('qemu-system-', self.vm_b.get_log())
+ else:
+ self.assertIn(msg, self.vm_b.get_log())
+
+ @staticmethod
+ def mapping(node_name: str, node_alias: str,
+ bitmap_name: str, bitmap_alias: str) \
+ -> BlockBitmapMapping:
+ return [{
+ 'node-name': node_name,
+ 'alias': node_alias,
+ 'bitmaps': [{
+ 'name': bitmap_name,
+ 'alias': bitmap_alias
+ }]
+ }]
+
+ def set_mapping(self, vm: iotests.VM, mapping: BlockBitmapMapping,
+ error: Optional[str] = None) \
+ -> None:
+ """
+ Invoke migrate-set-parameters on @vm to set the given @mapping.
+ Check for success if @error is None, or verify the error message
+ if it is not.
+ On success, verify that "info migrate_parameters" on HMP returns
+ our mapping. (Just to check its formatting code.)
+ """
+ result = vm.qmp('migrate-set-parameters',
+ block_bitmap_mapping=mapping)
+
+ if error is None:
+ self.assert_qmp(result, 'return', {})
+
+ result = vm.qmp('human-monitor-command',
+ command_line='info migrate_parameters')
+
+ hmp_mapping = re.search(r'^block-bitmap-mapping:\r?(\n .*)*\n',
+ result['return'], flags=re.MULTILINE)
+
+ self.assertEqual(hmp_mapping.group(0).replace('\r', ''),
+ self.to_hmp_mapping(mapping))
+ else:
+ self.assert_qmp(result, 'error/desc', error)
+
+ @staticmethod
+ def to_hmp_mapping(mapping: BlockBitmapMapping) -> str:
+ result = 'block-bitmap-mapping:\n'
+
+ for node in mapping:
+ result += f" '{node['node-name']}' -> '{node['alias']}'\n"
+
+ assert isinstance(node['bitmaps'], list)
+ for bitmap in node['bitmaps']:
+ result += f" '{bitmap['name']}' -> '{bitmap['alias']}'\n"
+
+ return result
+
+
+class TestAliasMigration(TestDirtyBitmapMigration):
+ src_node_name = 'node0'
+ dst_node_name = 'node0'
+ src_bmap_name = 'bmap0'
+ dst_bmap_name = 'bmap0'
+
+ def test_migration_without_alias(self) -> None:
+ self.migrate(self.src_node_name == self.dst_node_name and
+ self.src_bmap_name == self.dst_bmap_name)
+
+ # Check for error message on the destination
+ if self.src_node_name != self.dst_node_name:
+ self.verify_dest_error(f"Cannot find " \
+ f"device={self.src_node_name} nor " \
+ f"node_name={self.src_node_name}")
+ else:
+ self.verify_dest_error(None)
+
+ def test_alias_on_src_migration(self) -> None:
+ mapping = self.mapping(self.src_node_name, self.dst_node_name,
+ self.src_bmap_name, self.dst_bmap_name)
+
+ self.set_mapping(self.vm_a, mapping)
+ self.migrate()
+ self.verify_dest_error(None)
+
+ def test_alias_on_dst_migration(self) -> None:
+ mapping = self.mapping(self.dst_node_name, self.src_node_name,
+ self.dst_bmap_name, self.src_bmap_name)
+
+ self.set_mapping(self.vm_b, mapping)
+ self.migrate()
+ self.verify_dest_error(None)
+
+ def test_alias_on_both_migration(self) -> None:
+ src_map = self.mapping(self.src_node_name, 'node-alias',
+ self.src_bmap_name, 'bmap-alias')
+
+ dst_map = self.mapping(self.dst_node_name, 'node-alias',
+ self.dst_bmap_name, 'bmap-alias')
+
+ self.set_mapping(self.vm_a, src_map)
+ self.set_mapping(self.vm_b, dst_map)
+ self.migrate()
+ self.verify_dest_error(None)
+
+
+class TestNodeAliasMigration(TestAliasMigration):
+ src_node_name = 'node-src'
+ dst_node_name = 'node-dst'
+
+
+class TestBitmapAliasMigration(TestAliasMigration):
+ src_bmap_name = 'bmap-src'
+ dst_bmap_name = 'bmap-dst'
+
+
+class TestFullAliasMigration(TestAliasMigration):
+ src_node_name = 'node-src'
+ dst_node_name = 'node-dst'
+ src_bmap_name = 'bmap-src'
+ dst_bmap_name = 'bmap-dst'
+
+
+class TestLongBitmapNames(TestAliasMigration):
+ # Giving long bitmap names is OK, as long as there is a short alias for
+ # migration
+ src_bmap_name = 'a' * 512
+ dst_bmap_name = 'b' * 512
+
+ # Skip all tests that do not use the intermediate alias
+ def test_migration_without_alias(self) -> None:
+ pass
+
+ def test_alias_on_src_migration(self) -> None:
+ pass
+
+ def test_alias_on_dst_migration(self) -> None:
+ pass
+
+
+class TestBlockBitmapMappingErrors(TestDirtyBitmapMigration):
+ src_node_name = 'node0'
+ dst_node_name = 'node0'
+ src_bmap_name = 'bmap0'
+ dst_bmap_name = 'bmap0'
+
+ """
+ Note that mapping nodes or bitmaps that do not exist is not an error.
+ """
+
+ def test_non_injective_node_mapping(self) -> None:
+ mapping: BlockBitmapMapping = [
+ {
+ 'node-name': 'node0',
+ 'alias': 'common-alias',
+ 'bitmaps': [{
+ 'name': 'bmap0',
+ 'alias': 'bmap-alias0'
+ }]
+ },
+ {
+ 'node-name': 'node1',
+ 'alias': 'common-alias',
+ 'bitmaps': [{
+ 'name': 'bmap1',
+ 'alias': 'bmap-alias1'
+ }]
+ }
+ ]
+
+ self.set_mapping(self.vm_a, mapping,
+ "Invalid mapping given for block-bitmap-mapping: " \
+ "The node alias 'common-alias' is used twice")
+
+ def test_non_injective_bitmap_mapping(self) -> None:
+ mapping: BlockBitmapMapping = [{
+ 'node-name': 'node0',
+ 'alias': 'node-alias0',
+ 'bitmaps': [
+ {
+ 'name': 'bmap0',
+ 'alias': 'common-alias'
+ },
+ {
+ 'name': 'bmap1',
+ 'alias': 'common-alias'
+ }
+ ]
+ }]
+
+ self.set_mapping(self.vm_a, mapping,
+ "Invalid mapping given for block-bitmap-mapping: " \
+ "The bitmap alias 'node-alias0'/'common-alias' is " \
+ "used twice")
+
+ def test_ambiguous_node_mapping(self) -> None:
+ mapping: BlockBitmapMapping = [
+ {
+ 'node-name': 'node0',
+ 'alias': 'node-alias0',
+ 'bitmaps': [{
+ 'name': 'bmap0',
+ 'alias': 'bmap-alias0'
+ }]
+ },
+ {
+ 'node-name': 'node0',
+ 'alias': 'node-alias1',
+ 'bitmaps': [{
+ 'name': 'bmap0',
+ 'alias': 'bmap-alias0'
+ }]
+ }
+ ]
+
+ self.set_mapping(self.vm_a, mapping,
+ "Invalid mapping given for block-bitmap-mapping: " \
+ "The node name 'node0' is mapped twice")
+
+ def test_ambiguous_bitmap_mapping(self) -> None:
+ mapping: BlockBitmapMapping = [{
+ 'node-name': 'node0',
+ 'alias': 'node-alias0',
+ 'bitmaps': [
+ {
+ 'name': 'bmap0',
+ 'alias': 'bmap-alias0'
+ },
+ {
+ 'name': 'bmap0',
+ 'alias': 'bmap-alias1'
+ }
+ ]
+ }]
+
+ self.set_mapping(self.vm_a, mapping,
+ "Invalid mapping given for block-bitmap-mapping: " \
+ "The bitmap 'node0'/'bmap0' is mapped twice")
+
+ def test_migratee_node_is_not_mapped_on_src(self) -> None:
+ self.set_mapping(self.vm_a, [])
+ # Should just ignore all bitmaps on unmapped nodes
+ self.migrate(False)
+ self.verify_dest_error(None)
+
+ def test_migratee_node_is_not_mapped_on_dst(self) -> None:
+ self.set_mapping(self.vm_b, [])
+ self.migrate(False)
+ self.verify_dest_error(f"Unknown node alias '{self.src_node_name}'")
+
+ def test_migratee_bitmap_is_not_mapped_on_src(self) -> None:
+ mapping: BlockBitmapMapping = [{
+ 'node-name': self.src_node_name,
+ 'alias': self.dst_node_name,
+ 'bitmaps': []
+ }]
+
+ self.set_mapping(self.vm_a, mapping)
+ # Should just ignore all unmapped bitmaps
+ self.migrate(False)
+ self.verify_dest_error(None)
+
+ def test_migratee_bitmap_is_not_mapped_on_dst(self) -> None:
+ mapping: BlockBitmapMapping = [{
+ 'node-name': self.dst_node_name,
+ 'alias': self.src_node_name,
+ 'bitmaps': []
+ }]
+
+ self.set_mapping(self.vm_b, mapping)
+ self.migrate(False)
+ self.verify_dest_error(f"Unknown bitmap alias " \
+ f"'{self.src_bmap_name}' " \
+ f"on node '{self.dst_node_name}' " \
+ f"(alias '{self.src_node_name}')")
+
+ def test_unused_mapping_on_dst(self) -> None:
+ # Let the source not send any bitmaps
+ self.set_mapping(self.vm_a, [])
+
+ # Establish some mapping on the destination
+ self.set_mapping(self.vm_b, [])
+
+ # The fact that there is a mapping on B without any bitmaps
+ # being received should be fine, not fatal
+ self.migrate(False)
+ self.verify_dest_error(None)
+
+ def test_non_wellformed_node_alias(self) -> None:
+ alias = '123-foo'
+
+ mapping: BlockBitmapMapping = [{
+ 'node-name': self.src_node_name,
+ 'alias': alias,
+ 'bitmaps': []
+ }]
+
+ self.set_mapping(self.vm_a, mapping,
+ f"Invalid mapping given for block-bitmap-mapping: " \
+ f"The node alias '{alias}' is not well-formed")
+
+ def test_node_alias_too_long(self) -> None:
+ alias = 'a' * 256
+
+ mapping: BlockBitmapMapping = [{
+ 'node-name': self.src_node_name,
+ 'alias': alias,
+ 'bitmaps': []
+ }]
+
+ self.set_mapping(self.vm_a, mapping,
+ f"Invalid mapping given for block-bitmap-mapping: " \
+ f"The node alias '{alias}' is longer than 255 bytes")
+
+ def test_bitmap_alias_too_long(self) -> None:
+ alias = 'a' * 256
+
+ mapping = self.mapping(self.src_node_name, self.dst_node_name,
+ self.src_bmap_name, alias)
+
+ self.set_mapping(self.vm_a, mapping,
+ f"Invalid mapping given for block-bitmap-mapping: " \
+ f"The bitmap alias '{alias}' is longer than 255 " \
+ f"bytes")
+
+ def test_bitmap_name_too_long(self) -> None:
+ name = 'a' * 256
+
+ result = self.vm_a.qmp('block-dirty-bitmap-add',
+ node=self.src_node_name,
+ name=name)
+ self.assert_qmp(result, 'return', {})
+
+ self.migrate(False, False)
+
+ # Check for the error in the source's log
+ self.vm_a.shutdown()
+ self.assertIn(f"Cannot migrate bitmap '{name}' on node " \
+ f"'{self.src_node_name}': Name is longer than 255 bytes",
+ self.vm_a.get_log())
+
+ # Expect abnormal shutdown of the destination VM because of
+ # the failed migration
+ try:
+ self.vm_b.shutdown()
+ except qemu.machine.AbnormalShutdown:
+ pass
+
+ def test_aliased_bitmap_name_too_long(self) -> None:
+ # Longer than the maximum for bitmap names
+ self.dst_bmap_name = 'a' * 1024
+
+ mapping = self.mapping(self.dst_node_name, self.src_node_name,
+ self.dst_bmap_name, self.src_bmap_name)
+
+ # We would have to create this bitmap during migration, and
+ # that would fail, because the name is too long. Better to
+ # catch it early.
+ self.set_mapping(self.vm_b, mapping,
+ f"Invalid mapping given for block-bitmap-mapping: " \
+ f"The bitmap name '{self.dst_bmap_name}' is longer " \
+ f"than 1023 bytes")
+
+ def test_node_name_too_long(self) -> None:
+ # Longer than the maximum for node names
+ self.dst_node_name = 'a' * 32
+
+ mapping = self.mapping(self.dst_node_name, self.src_node_name,
+ self.dst_bmap_name, self.src_bmap_name)
+
+ # During migration, this would appear simply as a node that
+ # cannot be found. Still better to catch impossible node
+ # names early (similar to test_non_wellformed_node_alias).
+ self.set_mapping(self.vm_b, mapping,
+ f"Invalid mapping given for block-bitmap-mapping: " \
+ f"The node name '{self.dst_node_name}' is longer " \
+ f"than 31 bytes")
+
+
+class TestCrossAliasMigration(TestDirtyBitmapMigration):
+ """
+ Swap aliases, both to see that qemu does not get confused, and
+ that we can migrate multiple things at once.
+
+ So we migrate this:
+ node-a.bmap-a -> node-b.bmap-b
+ node-a.bmap-b -> node-b.bmap-a
+ node-b.bmap-a -> node-a.bmap-b
+ node-b.bmap-b -> node-a.bmap-a
+ """
+
+ src_node_name = 'node-a'
+ dst_node_name = 'node-b'
+ src_bmap_name = 'bmap-a'
+ dst_bmap_name = 'bmap-b'
+
+ def setUp(self) -> None:
+ TestDirtyBitmapMigration.setUp(self)
+
+ # Now create another block device and let both have two bitmaps each
+ result = self.vm_a.qmp('blockdev-add',
+ node_name='node-b', driver='null-co')
+ self.assert_qmp(result, 'return', {})
+
+ result = self.vm_b.qmp('blockdev-add',
+ node_name='node-a', driver='null-co')
+ self.assert_qmp(result, 'return', {})
+
+ bmaps_to_add = (('node-a', 'bmap-b'),
+ ('node-b', 'bmap-a'),
+ ('node-b', 'bmap-b'))
+
+ for (node, bmap) in bmaps_to_add:
+ result = self.vm_a.qmp('block-dirty-bitmap-add',
+ node=node, name=bmap)
+ self.assert_qmp(result, 'return', {})
+
+ @staticmethod
+ def cross_mapping() -> BlockBitmapMapping:
+ return [
+ {
+ 'node-name': 'node-a',
+ 'alias': 'node-b',
+ 'bitmaps': [
+ {
+ 'name': 'bmap-a',
+ 'alias': 'bmap-b'
+ },
+ {
+ 'name': 'bmap-b',
+ 'alias': 'bmap-a'
+ }
+ ]
+ },
+ {
+ 'node-name': 'node-b',
+ 'alias': 'node-a',
+ 'bitmaps': [
+ {
+ 'name': 'bmap-b',
+ 'alias': 'bmap-a'
+ },
+ {
+ 'name': 'bmap-a',
+ 'alias': 'bmap-b'
+ }
+ ]
+ }
+ ]
+
+ def verify_dest_has_all_bitmaps(self) -> None:
+ bitmaps = self.vm_b.query_bitmaps()
+
+ # Extract and sort bitmap names
+ for node in bitmaps:
+ bitmaps[node] = sorted((bmap['name'] for bmap in bitmaps[node]))
+
+ self.assertEqual(bitmaps,
+ {'node-a': ['bmap-a', 'bmap-b'],
+ 'node-b': ['bmap-a', 'bmap-b']})
+
+ def test_alias_on_src(self) -> None:
+ self.set_mapping(self.vm_a, self.cross_mapping())
+
+ # Checks that node-a.bmap-a was migrated to node-b.bmap-b, and
+ # that is enough
+ self.migrate()
+ self.verify_dest_has_all_bitmaps()
+ self.verify_dest_error(None)
+
+ def test_alias_on_dst(self) -> None:
+ self.set_mapping(self.vm_b, self.cross_mapping())
+
+ # Checks that node-a.bmap-a was migrated to node-b.bmap-b, and
+ # that is enough
+ self.migrate()
+ self.verify_dest_has_all_bitmaps()
+ self.verify_dest_error(None)
+
+
+if __name__ == '__main__':
+ iotests.main(supported_protocols=['file'])
diff --git a/tests/qemu-iotests/300.out b/tests/qemu-iotests/300.out
new file mode 100644
index 0000000000..cafb8161f7
--- /dev/null
+++ b/tests/qemu-iotests/300.out
@@ -0,0 +1,5 @@
+.....................................
+----------------------------------------------------------------------
+Ran 37 tests
+
+OK
diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group
index 1dc034d3af..17fdc2cdaa 100644
--- a/tests/qemu-iotests/group
+++ b/tests/qemu-iotests/group
@@ -308,6 +308,7 @@
296 rw
297 meta
299 auto quick
+300 migration
301 backing quick
302 quick
304 rw quick
--
2.26.2
^ permalink raw reply related [flat|nested] 8+ messages in thread