It is obsolete. It is better to use driver_mirror+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>
---
Can any of you give one example of how to use driver_mirror+NBD for
deprecated.rst?
Thanks, Juan.
---
docs/about/deprecated.rst | 6 ++++++
qapi/migration.json | 29 +++++++++++++++++++++++++----
migration/block.c | 2 ++
migration/options.c | 7 +++++++
4 files changed, 40 insertions(+), 4 deletions(-)
diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst
index 518672722d..173c5ba5cb 100644
--- a/docs/about/deprecated.rst
+++ b/docs/about/deprecated.rst
@@ -454,3 +454,9 @@ Everything except ``-incoming defer`` are deprecated. This allows to
setup parameters before launching the proper migration with
``migrate-incoming uri``.
+block migration (since 8.1)
+'''''''''''''''''''''''''''
+
+Block migration is too inflexible. It needs to migrate all block
+devices or none. Use driver_mirror+NBD instead.
+
diff --git a/qapi/migration.json b/qapi/migration.json
index b71e00737e..a8497de48d 100644
--- a/qapi/migration.json
+++ b/qapi/migration.json
@@ -258,11 +258,16 @@
# blocked. Present and non-empty when migration is blocked.
# (since 6.0)
#
+# Features:
+#
+# @deprecated: @disk migration is deprecated. Use driver_mirror+NBD
+# instead.
+#
# 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',
@@ -497,6 +502,9 @@
#
# Features:
#
+# @deprecated: @block migration is deprecated. Use driver_mirror+NBD
+# instead.
+#
# @unstable: Members @x-colo and @x-ignore-shared are experimental.
#
# Since: 1.2
@@ -506,7 +514,8 @@
'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',
@@ -789,6 +798,9 @@
#
# Features:
#
+# @deprecated: Member @block-incremental is obsolete. Use
+# driver_mirror+NBD instead.
+#
# @unstable: Member @x-checkpoint-delay is experimental.
#
# Since: 2.4
@@ -803,7 +815,7 @@
'tls-creds', 'tls-hostname', 'tls-authz', 'max-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',
@@ -945,6 +957,9 @@
#
# Features:
#
+# @deprecated: Member @block-incremental is obsolete. Use
+# driver_mirror+NBD instead.
+#
# @unstable: Member @x-checkpoint-delay is experimental.
#
# TODO: either fuse back into MigrationParameters, or make
@@ -972,7 +987,8 @@
'*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',
@@ -1137,6 +1153,9 @@
#
# Features:
#
+# @deprecated: Member @block-incremental is obsolete. Use
+# driver_mirror+NBD instead.
+#
# @unstable: Member @x-checkpoint-delay is experimental.
#
# Since: 2.4
@@ -1161,6 +1180,8 @@
'*downtime-limit': 'uint64',
'*x-checkpoint-delay': { 'type': 'uint32',
'features': [ 'unstable' ] },
+ '*block-incremental': { 'type': 'bool',
+ 'features': [ 'deprecated' ] },
'*block-incremental': 'bool',
'*multifd-channels': 'uint8',
'*xbzrle-cache-size': 'size',
diff --git a/migration/block.c b/migration/block.c
index b9580a6c7e..2521a22269 100644
--- a/migration/block.c
+++ b/migration/block.c
@@ -722,6 +722,8 @@ 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 mirror jobs instead.");
+
qemu_mutex_lock_iothread();
ret = init_blk_migration(f);
if (ret < 0) {
diff --git a/migration/options.c b/migration/options.c
index b62ab30cd5..374dc0767e 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"
@@ -437,6 +438,10 @@ bool migrate_caps_check(bool *old_caps, bool *new_caps, Error **errp)
return false;
}
#endif
+ if (new_caps[MIGRATION_CAPABILITY_BLOCK]) {
+ warn_report("Block migration is deprecated. "
+ "Use driver_mirror+NBD instead.");
+ }
#ifndef CONFIG_REPLICATION
if (new_caps[MIGRATION_CAPABILITY_X_COLO]) {
@@ -1257,6 +1262,8 @@ static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
}
if (params->has_block_incremental) {
+ warn_report("Block migration is deprecated. "
+ "Use driver_mirror+NBD instead.");
s->parameters.block_incremental = params->block_incremental;
}
if (params->has_multifd_channels) {
--
2.40.1
