Juan Quintela <quintela@xxxxxxxxxx> writes:
> It is obsolete. It is better to use driver-mirror with NBD instead.
drive-mirror
Several more below.
>
> 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>
> ---
> docs/about/deprecated.rst | 10 ++++++++++
> qapi/migration.json | 30 +++++++++++++++++++++++++-----
> migration/block.c | 3 +++
> migration/options.c | 9 ++++++++-
> 4 files changed, 46 insertions(+), 6 deletions(-)
>
> diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst
> index b2b7e11742..e46f3df376 100644
> --- a/docs/about/deprecated.rst
> +++ b/docs/about/deprecated.rst
> @@ -431,3 +431,13 @@ The new way to modify migration is using migration parameters.
> ``blk`` functionality can be achieved by setting the
> ``block`` migration capability to ``true``.
>
> +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
> +``driver-mirror`` + NBD" in docs/interop/live-block-operations.rst for
> +a detailed explanation.
> +
> diff --git a/qapi/migration.json b/qapi/migration.json
> index e4949e0d8e..bf6e1ac5b5 100644
> --- a/qapi/migration.json
> +++ b/qapi/migration.json
> @@ -269,11 +269,16 @@
> # average memory load of the virtual CPU indirectly. Note that
> # zero means guest doesn't dirty memory. (Since 8.1)
> #
> +# Features:
> +#
> +# @deprecated: @disk migration is deprecated. Use driver-mirror
> +# with NBD instead.
> +#
Suggest:
# @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',
> @@ -526,6 +531,9 @@
> #
> # Features:
> #
> +# @deprecated: @block migration is deprecated. Use driver-mirror
> +# with NBD instead.
> +#
Suggest:
# @deprecated: Member @block is deprecated. Use drrive-mirror with
# NBD instead.
> # @unstable: Members @x-colo and @x-ignore-shared are experimental.
> #
> # Since: 1.2
> @@ -535,7 +543,8 @@
> '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',
> @@ -826,6 +835,9 @@
> #
> # Features:
> #
> +# @deprecated: Member @block-incremental is obsolete. Use
> +# driver-mirror with NBD instead.
> +#
Wait! This is what PATCH 1 tells users to use instead of deprecated
@inc. You need to update that deprecation note to point to a
non-deprecated replacement.
> # @unstable: Members @x-checkpoint-delay and @x-vcpu-dirty-limit-period
> # are experimental.
> #
> @@ -841,7 +853,7 @@
> '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',
> @@ -992,6 +1004,9 @@
> #
> # Features:
> #
> +# @deprecated: Member @block-incremental is obsolete. Use
> +# driver-mirror with NBD instead.
> +#
> # @unstable: Members @x-checkpoint-delay and @x-vcpu-dirty-limit-period
> # are experimental.
> #
> @@ -1020,7 +1035,8 @@
> '*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',
> @@ -1195,6 +1211,9 @@
> #
> # Features:
> #
> +# @deprecated: Member @block-incremental is obsolete. Use
> +# driver-mirror with NBD instead.
> +#
> # @unstable: Members @x-checkpoint-delay and @x-vcpu-dirty-limit-period
> # are experimental.
> #
> @@ -1220,7 +1239,8 @@
> '*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 5f930870a5..46bb431ed3 100644
> --- a/migration/block.c
> +++ b/migration/block.c
> @@ -729,6 +729,9 @@ 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 driver-mirror with"
> + "NBD instead.");
> +
> qemu_mutex_lock_iothread();
> ret = init_blk_migration(f);
> if (ret < 0) {
> diff --git a/migration/options.c b/migration/options.c
> index 6bbfd4853d..48cbbd682a 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"
> @@ -464,10 +465,14 @@ 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 driver-mirror with NBD instead.\n");
> return false;
> }
> #endif
> + if (new_caps[MIGRATION_CAPABILITY_BLOCK]) {
> + warn_report("Block migration is deprecated. "
> + "Use driver-mirror with NBD instead.");
> + }
>
> #ifndef CONFIG_REPLICATION
> if (new_caps[MIGRATION_CAPABILITY_X_COLO]) {
> @@ -1351,6 +1356,8 @@ static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
> }
>
> if (params->has_block_incremental) {
> + warn_report("Block migration is deprecated. "
> + "Use driver-mirror with NBD instead.");
> s->parameters.block_incremental = params->block_incremental;
> }
> if (params->has_multifd_channels) {
