It is obsolete. It is better to use driver-mirror with NBD instead.
CC: Kevin Wolf <kwolf@xxxxxxxxxx>
CC: Eric Blake <eblake@xxxxxxxxxx>
CC: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
CC: Hanna Czenczek <hreitz@xxxxxxxxxx>
Signed-off-by: Juan Quintela <quintela@xxxxxxxxxx>
Acked-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
Reviewed-by: Markus Armbruster <armbru@xxxxxxxxxx>
---
docs/about/deprecated.rst | 10 ++++++++++
qapi/migration.json | 29 ++++++++++++++++++++++++-----
migration/block.c | 3 +++
migration/options.c | 9 ++++++++-
4 files changed, 45 insertions(+), 6 deletions(-)
diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst
index 1312c563bb..a48591c049 100644
--- a/docs/about/deprecated.rst
+++ b/docs/about/deprecated.rst
@@ -479,3 +479,13 @@ As an intermediate step the ``blk`` functionality can be achieved by
setting the ``block`` migration capability to ``true``. But this
capability is also deprecated.
+block migration (since 8.2)
+'''''''''''''''''''''''''''
+
+Block migration is too inflexible. It needs to migrate all block
+devices or none.
+
+Please see "QMP invocation for live storage migration with
+``blockdev-mirror`` + NBD" in docs/interop/live-block-operations.rst
+for a detailed explanation.
+
diff --git a/qapi/migration.json b/qapi/migration.json
index 3765c2b662..e3b00a215b 100644
--- a/qapi/migration.json
+++ b/qapi/migration.json
@@ -269,11 +269,15 @@
# average memory load of the virtual CPU indirectly. Note that
# zero means guest doesn't dirty memory. (Since 8.1)
#
+# Features:
+#
+# @deprecated: Member @disk is deprecated because block migration is.
+#
# Since: 0.14
##
{ 'struct': 'MigrationInfo',
'data': {'*status': 'MigrationStatus', '*ram': 'MigrationStats',
- '*disk': 'MigrationStats',
+ '*disk': { 'type': 'MigrationStats', 'features': [ 'deprecated' ] },
'*vfio': 'VfioStats',
'*xbzrle-cache': 'XBZRLECacheStats',
'*total-time': 'int',
@@ -525,6 +529,9 @@
#
# Features:
#
+# @deprecated: Member @block is deprecated. Use blockdev-mirror with
+# NBD instead.
+#
# @unstable: Members @x-colo and @x-ignore-shared are experimental.
#
# Since: 1.2
@@ -534,7 +541,8 @@
'compress', 'events', 'postcopy-ram',
{ 'name': 'x-colo', 'features': [ 'unstable' ] },
'release-ram',
- 'block', 'return-path', 'pause-before-switchover', 'multifd',
+ { 'name': 'block', 'features': [ 'deprecated' ] },
+ 'return-path', 'pause-before-switchover', 'multifd',
'dirty-bitmaps', 'postcopy-blocktime', 'late-block-activate',
{ 'name': 'x-ignore-shared', 'features': [ 'unstable' ] },
'validate-uuid', 'background-snapshot',
@@ -835,6 +843,9 @@
#
# Features:
#
+# @deprecated: Member @block-incremental is deprecated. Use
+# blockdev-mirror with NBD instead.
+#
# @unstable: Members @x-checkpoint-delay and @x-vcpu-dirty-limit-period
# are experimental.
#
@@ -850,7 +861,7 @@
'tls-creds', 'tls-hostname', 'tls-authz', 'max-bandwidth',
'avail-switchover-bandwidth', 'downtime-limit',
{ 'name': 'x-checkpoint-delay', 'features': [ 'unstable' ] },
- 'block-incremental',
+ { 'name': 'block-incremental', 'features': [ 'deprecated' ] },
'multifd-channels',
'xbzrle-cache-size', 'max-postcopy-bandwidth',
'max-cpu-throttle', 'multifd-compression',
@@ -1011,6 +1022,9 @@
#
# Features:
#
+# @deprecated: Member @block-incremental is deprecated. Use
+# blockdev-mirror with NBD instead.
+#
# @unstable: Members @x-checkpoint-delay and @x-vcpu-dirty-limit-period
# are experimental.
#
@@ -1040,7 +1054,8 @@
'*downtime-limit': 'uint64',
'*x-checkpoint-delay': { 'type': 'uint32',
'features': [ 'unstable' ] },
- '*block-incremental': 'bool',
+ '*block-incremental': { 'type': 'bool',
+ 'features': [ 'deprecated' ] },
'*multifd-channels': 'uint8',
'*xbzrle-cache-size': 'size',
'*max-postcopy-bandwidth': 'size',
@@ -1225,6 +1240,9 @@
#
# Features:
#
+# @deprecated: Member @block-incremental is deprecated. Use
+# blockdev-mirror with NBD instead.
+#
# @unstable: Members @x-checkpoint-delay and @x-vcpu-dirty-limit-period
# are experimental.
#
@@ -1251,7 +1269,8 @@
'*downtime-limit': 'uint64',
'*x-checkpoint-delay': { 'type': 'uint32',
'features': [ 'unstable' ] },
- '*block-incremental': 'bool',
+ '*block-incremental': { 'type': 'bool',
+ 'features': [ 'deprecated' ] },
'*multifd-channels': 'uint8',
'*xbzrle-cache-size': 'size',
'*max-postcopy-bandwidth': 'size',
diff --git a/migration/block.c b/migration/block.c
index b60698d6e2..acffe88f84 100644
--- a/migration/block.c
+++ b/migration/block.c
@@ -731,6 +731,9 @@ static int block_save_setup(QEMUFile *f, void *opaque)
trace_migration_block_save("setup", block_mig_state.submitted,
block_mig_state.transferred);
+ warn_report("block migration is deprecated;"
+ " use blockdev-mirror with NBD instead");
+
ret = init_blk_migration(f);
if (ret < 0) {
return ret;
diff --git a/migration/options.c b/migration/options.c
index 42fb818956..a753eae438 100644
--- a/migration/options.c
+++ b/migration/options.c
@@ -12,6 +12,7 @@
*/
#include "qemu/osdep.h"
+#include "qemu/error-report.h"
#include "exec/target_page.h"
#include "qapi/clone-visitor.h"
#include "qapi/error.h"
@@ -473,10 +474,14 @@ bool migrate_caps_check(bool *old_caps, bool *new_caps, Error **errp)
if (new_caps[MIGRATION_CAPABILITY_BLOCK]) {
error_setg(errp, "QEMU compiled without old-style (blk/-b, inc/-i) "
"block migration");
- error_append_hint(errp, "Use drive_mirror+NBD instead.\n");
+ error_append_hint(errp, "Use blockdev-mirror with NBD instead.\n");
return false;
}
#endif
+ if (new_caps[MIGRATION_CAPABILITY_BLOCK]) {
+ warn_report("block migration is deprecated;"
+ " use blockdev-mirror with NBD instead");
+ }
#ifndef CONFIG_REPLICATION
if (new_caps[MIGRATION_CAPABILITY_X_COLO]) {
@@ -1386,6 +1391,8 @@ static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
}
if (params->has_block_incremental) {
+ warn_report("block migration is deprecated;"
+ " use blockdev-mirror with NBD instead");
s->parameters.block_incremental = params->block_incremental;
}
if (params->has_multifd_channels) {
--
2.41.0
