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migration: Remove zero-blocks capability

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It was declared deprecated since 9.2.

Reviewed-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20260115225503.3083355-2-peterx@redhat.com
Signed-off-by: Fabiano Rosas <farosas@suse.de>
This commit is contained in:
Peter Xu
2026-01-15 17:55:02 -05:00
committed by Fabiano Rosas
parent 3346b16aa2
commit aa575660d0
4 changed files with 7 additions and 23 deletions
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6
docs/about/deprecated.rst
View File

@@ -532,9 +532,3 @@ usage of providing a file descriptor to a plain file has been
deprecated in favor of explicitly using the ``file:`` URI with the
file descriptor being passed as an ``fdset``. Refer to the ``add-fd``
command documentation for details on the ``fdset`` usage.
``zero-blocks`` capability (since 9.2)
''''''''''''''''''''''''''''''''''''''
The ``zero-blocks`` capability was part of the block migration which
doesn't exist anymore since it was removed in QEMU v9.1.

7
docs/about/removed-features.rst
View File

@@ -723,6 +723,13 @@ Block migration has been removed. For a replacement, see "QMP
invocation for live storage migration with ``blockdev-mirror`` + NBD"
in docs/interop/live-block-operations.rst.
``migrate-set-capabilities`` ``zero-blocks`` option (removed in 11.0)
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
The ``zero-blocks`` capability was accidentally left behind when
block migration capability got removed in 9.1. Removed with no
replacement.
``migrate-set-parameter`` ``compress-level`` option (removed in 9.1)
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

5
migration/options.c
View File

@@ -188,7 +188,6 @@ const Property migration_properties[] = {
DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE),
DEFINE_PROP_MIG_CAP("x-rdma-pin-all", MIGRATION_CAPABILITY_RDMA_PIN_ALL),
DEFINE_PROP_MIG_CAP("x-auto-converge", MIGRATION_CAPABILITY_AUTO_CONVERGE),
DEFINE_PROP_MIG_CAP("x-zero-blocks", MIGRATION_CAPABILITY_ZERO_BLOCKS),
DEFINE_PROP_MIG_CAP("x-events", MIGRATION_CAPABILITY_EVENTS),
DEFINE_PROP_MIG_CAP("x-postcopy-ram", MIGRATION_CAPABILITY_POSTCOPY_RAM),
DEFINE_PROP_MIG_CAP("x-postcopy-preempt",
@@ -576,10 +575,6 @@ bool migrate_caps_check(bool *old_caps, bool *new_caps, Error **errp)
ERRP_GUARD();
MigrationIncomingState *mis = migration_incoming_get_current();
if (new_caps[MIGRATION_CAPABILITY_ZERO_BLOCKS]) {
warn_report("zero-blocks capability is deprecated");
}
#ifndef CONFIG_REPLICATION
if (new_caps[MIGRATION_CAPABILITY_X_COLO]) {
error_setg(errp, "QEMU compiled without replication module"

12
qapi/migration.json
View File

@@ -440,13 +440,6 @@
# footprint is mlock()'d on demand or all at once. Refer to
# docs/rdma.txt for usage. Disabled by default. (since 2.0)
#
# @zero-blocks: During storage migration encode blocks of zeroes
# efficiently. This essentially saves 1MB of zeroes per block on
# the wire. Enabling requires source and target VM to support
# this feature. To enable it is sufficient to enable the
# capability on the source VM. The feature is disabled by
# default. (since 1.6)
#
# @events: generate events for each migration state change (since 2.4)
#
# @auto-converge: If enabled, QEMU will automatically throttle down
@@ -531,14 +524,10 @@
#
# @unstable: Members @x-colo and @x-ignore-shared are experimental.
#
# @deprecated: Member @zero-blocks is deprecated as being part of
# block migration which was already removed.
#
# Since: 1.2
##
{ 'enum': 'MigrationCapability',
'data': ['xbzrle', 'rdma-pin-all', 'auto-converge',
{ 'name': 'zero-blocks', 'features': [ 'deprecated' ] },
'events', 'postcopy-ram',
{ 'name': 'x-colo', 'features': [ 'unstable' ] },
'release-ram',
@@ -595,7 +584,6 @@
# {"state": false, "capability": "xbzrle"},
# {"state": false, "capability": "rdma-pin-all"},
# {"state": false, "capability": "auto-converge"},
# {"state": false, "capability": "zero-blocks"},
# {"state": true, "capability": "events"},
# {"state": false, "capability": "postcopy-ram"},
# {"state": false, "capability": "x-colo"}