[PATCH v6 0/5] Migration deprecated parts

[PATCH v6 0/5] Migration deprecated parts

[Juan Quintela]

Based on: Message-ID: <20231017083003.15951-1-quintela@redhat.com>
          Migration 20231017 patches

On this v6:
- Fixed Markus comments
- 1st patch is reviewed
- dropped the RFC ones.

Later, Juan.

On this v5:
- Rebased on top of last migration pull requesnt:

- address markus comments.  Basically we recommend always
  blockdev-mirror + NBD.  In deprecated.rst we also put the posiblity
  of using block-incremental and block, but we state that they are
  also deprecated.
  I know, I know, I deprecated them in the following patch.

- Dropped the removal of block-migration and block-incremental I am
  only interested in showing why I want to remove the -b/-i options.

Please review.

Later, Juan.

On this v4:
- addressed all markus comments.
- rebased on latest.
- improve formatting of migration.json
- print block migration status when needed.
- patches 7-10 are not mean to merge, they just show why we want to
  deprecate block migration and remove its support.
- Patch 7 just drop support for -i/-b and qmp equivalents.
- Patch 8 shows all the helpers and convolutions we need to have to
  support that -i and -d.
- patch 9 drops block-incremental migration support.
- patch 9 drops block migration support.

Please review.

Thanks, Juan.

On this v3:

- Rebase on top of upstream.
- Changed v8.1 to 8.2 (I left the reviewed by anyways)
- missing the block deprecation code, please.

Please, review.

Later, Juan.

On this v2:

- dropped -incoming <uri> deprecation
  Paolo came with a better solution using keyvalues.

- skipped field is already ready for next pull request, so dropped.

- dropped the RFC bits, nermal PATCH.

- Assessed all the review comments.

- Added indentation of migration.json.

- Used the documentation pointer to substitute block migration.

Please review.

[v1]
Hi this series describe the migration parts that have to be deprecated.

- It is an rfc because I doubt that I did the deprecation process right. Hello Markus O:-)

- skipped field: It is older than me, I have never know what it stands
  for.  As far as I know it has always been zero.

- inc/blk migrate command options.  They are only used by block
  migration (that I deprecate on the following patch).  And they are really bad.
  grep must_remove_block_options.

- block migration.  block jobs, whatever they are called this week are
  way more flexible.  Current code works, but we broke it here and
  there, and really nobody has stand up to maintain it.  It is quite
  contained and can be left there.  Is anyone really using it?

- old compression method.  It don't work.  See last try from Lukas to
  make a test that works reliabely.  I failed with the same task years
  ago.  It is really slow, and if compression is good for you, multifd
  + zlib is going to perform/compress way more.

  I don't know what to do with this code, really.

  * Remove it for this release?  It don't work, and haven't work
    reliabely in quite a few time.

  * Deprecate it and remove in another couple of releases, i.e. normal
    deprecation.

  * Ideas?

- -incoming <uri>

  if you need to set parameters (multifd cames to mind, and preempt has
  the same problem), you really needs to use defer.  So what should we do here?

  This part is not urget, because management apps have a working
  option that are already using "defer", and the code simplifacation
  if we remove it is not so big.  So we can leave it until 9.0 or
  whatever we think fit.

What do you think?

Later, Juan.

Juan Quintela (5):
  migration: Print block status when needed
  migration: migrate 'inc' command option is deprecated.
  migration: migrate 'blk' command option is deprecated.
  migration: Deprecate block migration
  migration: Deprecate old compression method

 docs/about/deprecated.rst      | 36 +++++++++++++
 qapi/migration.json            | 93 ++++++++++++++++++++++++++--------
 migration/block.c              |  3 ++
 migration/migration-hmp-cmds.c | 15 ++++--
 migration/migration.c          | 10 ++++
 migration/options.c            | 22 +++++++-
 6 files changed, 153 insertions(+), 26 deletions(-)

-- 
2.41.0

[PATCH v6 1/5] migration: Print block status when needed

[Juan Quintela]

The new line was only printed when command options were used.  When we
used migration parameters and capabilities, it wasn't.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
---
 migration/migration-hmp-cmds.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/migration/migration-hmp-cmds.c b/migration/migration-hmp-cmds.c
index d206700a43..a82597f18e 100644
--- a/migration/migration-hmp-cmds.c
+++ b/migration/migration-hmp-cmds.c
@@ -30,6 +30,7 @@
 #include "sysemu/runstate.h"
 #include "ui/qemu-spice.h"
 #include "sysemu/sysemu.h"
+#include "options.h"
 #include "migration.h"
 
 static void migration_global_dump(Monitor *mon)
@@ -696,7 +697,6 @@ void hmp_x_colo_lost_heartbeat(Monitor *mon, const QDict *qdict)
 typedef struct HMPMigrationStatus {
     QEMUTimer *timer;
     Monitor *mon;
-    bool is_block_migration;
 } HMPMigrationStatus;
 
 static void hmp_migrate_status_cb(void *opaque)
@@ -722,7 +722,7 @@ static void hmp_migrate_status_cb(void *opaque)
 
         timer_mod(status->timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + 1000);
     } else {
-        if (status->is_block_migration) {
+        if (migrate_block()) {
             monitor_printf(status->mon, "\n");
         }
         if (info->error_desc) {
@@ -762,7 +762,6 @@ void hmp_migrate(Monitor *mon, const QDict *qdict)
 
         status = g_malloc0(sizeof(*status));
         status->mon = mon;
-        status->is_block_migration = blk || inc;
         status->timer = timer_new_ms(QEMU_CLOCK_REALTIME, hmp_migrate_status_cb,
                                           status);
         timer_mod(status->timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME));
-- 
2.41.0

[PATCH v6 2/5] migration: migrate 'inc' command option is deprecated.

[Juan Quintela]

Use blockdev-mirror with NBD instead.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 docs/about/deprecated.rst      | 9 +++++++++
 qapi/migration.json            | 8 +++++++-
 migration/migration-hmp-cmds.c | 5 +++++
 migration/migration.c          | 5 +++++
 4 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst
index 2febd2d12f..b51136f50a 100644
--- a/docs/about/deprecated.rst
+++ b/docs/about/deprecated.rst
@@ -461,3 +461,12 @@ Migration
 ``skipped`` field in Migration stats has been deprecated.  It hasn't
 been used for more than 10 years.
 
+``inc`` migrate command option (since 8.2)
+''''''''''''''''''''''''''''''''''''''''''
+
+Use blockdev-mirror with NBD instead.
+
+As an intermediate step the ``inc`` functionality can be achieved by
+setting the ``block-incremental`` migration parameter to ``true``.
+But this parameter is also deprecated.
+
diff --git a/qapi/migration.json b/qapi/migration.json
index db3df12d6c..fa7f4f2575 100644
--- a/qapi/migration.json
+++ b/qapi/migration.json
@@ -1524,6 +1524,11 @@
 #
 # @resume: resume one paused migration, default "off". (since 3.0)
 #
+# Features:
+#
+# @deprecated: Member @inc is deprecated.  Use blockdev-mirror with
+#     NBD instead.
+#
 # Returns: nothing on success
 #
 # Since: 0.14
@@ -1545,7 +1550,8 @@
 # <- { "return": {} }
 ##
 { 'command': 'migrate',
-  'data': {'uri': 'str', '*blk': 'bool', '*inc': 'bool',
+  'data': {'uri': 'str', '*blk': 'bool',
+           '*inc': { 'type': 'bool', 'features': [ 'deprecated' ] },
            '*detach': 'bool', '*resume': 'bool' } }
 
 ##
diff --git a/migration/migration-hmp-cmds.c b/migration/migration-hmp-cmds.c
index a82597f18e..83176f5bae 100644
--- a/migration/migration-hmp-cmds.c
+++ b/migration/migration-hmp-cmds.c
@@ -745,6 +745,11 @@ void hmp_migrate(Monitor *mon, const QDict *qdict)
     const char *uri = qdict_get_str(qdict, "uri");
     Error *err = NULL;
 
+    if (inc) {
+        warn_report("option '-i' is deprecated;"
+                    " use blockdev-mirror with NBD instead");
+    }
+
     qmp_migrate(uri, !!blk, blk, !!inc, inc,
                 false, false, true, resume, &err);
     if (hmp_handle_error(mon, err)) {
diff --git a/migration/migration.c b/migration/migration.c
index 6ba5e145ac..e54baf9102 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1603,6 +1603,11 @@ static bool migrate_prepare(MigrationState *s, bool blk, bool blk_inc,
 {
     Error *local_err = NULL;
 
+    if (blk_inc) {
+        warn_report("parameter 'inc' is deprecated;"
+                    " use blockdev-mirror with NBD instead");
+    }
+
     if (resume) {
         if (s->state != MIGRATION_STATUS_POSTCOPY_PAUSED) {
             error_setg(errp, "Cannot resume if there is no "
-- 
2.41.0

[PATCH v6 3/5] migration: migrate 'blk' command option is deprecated.

[Juan Quintela]

Use blocked-mirror with NBD instead.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
---
 docs/about/deprecated.rst      | 9 +++++++++
 qapi/migration.json            | 7 ++++---
 migration/migration-hmp-cmds.c | 5 +++++
 migration/migration.c          | 5 +++++
 4 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst
index b51136f50a..1312c563bb 100644
--- a/docs/about/deprecated.rst
+++ b/docs/about/deprecated.rst
@@ -470,3 +470,12 @@ As an intermediate step the ``inc`` functionality can be achieved by
 setting the ``block-incremental`` migration parameter to ``true``.
 But this parameter is also deprecated.
 
+``blk`` migrate command option (since 8.2)
+''''''''''''''''''''''''''''''''''''''''''
+
+Use blockdev-mirror with NBD instead.
+
+As an intermediate step the ``blk`` functionality can be achieved by
+setting the ``block`` migration capability to ``true``.  But this
+capability is also deprecated.
+
diff --git a/qapi/migration.json b/qapi/migration.json
index fa7f4f2575..3765c2b662 100644
--- a/qapi/migration.json
+++ b/qapi/migration.json
@@ -1526,8 +1526,8 @@
 #
 # Features:
 #
-# @deprecated: Member @inc is deprecated.  Use blockdev-mirror with
-#     NBD instead.
+# @deprecated: Members @inc and @blk are deprecated.  Use
+#     blockdev-mirror with NBD instead.
 #
 # Returns: nothing on success
 #
@@ -1550,7 +1550,8 @@
 # <- { "return": {} }
 ##
 { 'command': 'migrate',
-  'data': {'uri': 'str', '*blk': 'bool',
+  'data': {'uri': 'str',
+           '*blk': { 'type': 'bool', 'features': [ 'deprecated' ] },
            '*inc': { 'type': 'bool', 'features': [ 'deprecated' ] },
            '*detach': 'bool', '*resume': 'bool' } }
 
diff --git a/migration/migration-hmp-cmds.c b/migration/migration-hmp-cmds.c
index 83176f5bae..dfe98da355 100644
--- a/migration/migration-hmp-cmds.c
+++ b/migration/migration-hmp-cmds.c
@@ -750,6 +750,11 @@ void hmp_migrate(Monitor *mon, const QDict *qdict)
                     " use blockdev-mirror with NBD instead");
     }
 
+    if (blk) {
+        warn_report("option '-b' is deprecated;"
+                    " use blockdev-mirror with NBD instead");
+    }
+
     qmp_migrate(uri, !!blk, blk, !!inc, inc,
                 false, false, true, resume, &err);
     if (hmp_handle_error(mon, err)) {
diff --git a/migration/migration.c b/migration/migration.c
index e54baf9102..16d4602e52 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1608,6 +1608,11 @@ static bool migrate_prepare(MigrationState *s, bool blk, bool blk_inc,
                     " use blockdev-mirror with NBD instead");
     }
 
+    if (blk) {
+        warn_report("parameter 'blk is deprecated;"
+                    " use blockdev-mirror with NBD instead");
+    }
+
     if (resume) {
         if (s->state != MIGRATION_STATUS_POSTCOPY_PAUSED) {
             error_setg(errp, "Cannot resume if there is no "
-- 
2.41.0

[PATCH v6 4/5] migration: Deprecate block migration

[Juan Quintela]

It is obsolete.  It is better to use driver-mirror with NBD instead.

CC: Kevin Wolf <kwolf@redhat.com>
CC: Eric Blake <eblake@redhat.com>
CC: Stefan Hajnoczi <stefanha@redhat.com>
CC: Hanna Czenczek <hreitz@redhat.com>

Signed-off-by: Juan Quintela <quintela@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
---
 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

[PATCH v6 5/5] migration: Deprecate old compression method

[Juan Quintela]

Signed-off-by: Juan Quintela <quintela@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Acked-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
---
 docs/about/deprecated.rst |  8 +++++
 qapi/migration.json       | 63 ++++++++++++++++++++++++++-------------
 migration/options.c       | 13 ++++++++
 3 files changed, 64 insertions(+), 20 deletions(-)

diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst
index a48591c049..0df9b738e0 100644
--- a/docs/about/deprecated.rst
+++ b/docs/about/deprecated.rst
@@ -489,3 +489,11 @@ Please see "QMP invocation for live storage migration with
 ``blockdev-mirror`` + NBD" in docs/interop/live-block-operations.rst
 for a detailed explanation.
 
+old compression method (since 8.2)
+''''''''''''''''''''''''''''''''''
+
+Compression method fails too much.  Too many races.  We are going to
+remove it if nobody fixes it.  For starters, migration-test
+compression tests are disabled becase they fail randomly.  If you need
+compression, use multifd compression methods.
+
diff --git a/qapi/migration.json b/qapi/migration.json
index e3b00a215b..e6610af428 100644
--- a/qapi/migration.json
+++ b/qapi/migration.json
@@ -272,6 +272,10 @@
 # Features:
 #
 # @deprecated: Member @disk is deprecated because block migration is.
+#     Member @compression is deprecated because it is unreliable and
+#     untested.  It is recommended to use multifd migration, which
+#     offers an alternative compression implementation that is
+#     reliable and tested.
 #
 # Since: 0.14
 ##
@@ -289,7 +293,7 @@
            '*blocked-reasons': ['str'],
            '*postcopy-blocktime': 'uint32',
            '*postcopy-vcpu-blocktime': ['uint32'],
-           '*compression': 'CompressionStats',
+           '*compression': { 'type': 'CompressionStats', 'features': [ 'deprecated' ] },
            '*socket-address': ['SocketAddress'],
            '*dirty-limit-throttle-time-per-round': 'uint64',
            '*dirty-limit-ring-full-time': 'uint64'} }
@@ -530,7 +534,10 @@
 # Features:
 #
 # @deprecated: Member @block is deprecated.  Use blockdev-mirror with
-#     NBD instead.
+#     NBD instead.  Member @compression is deprecated because it is
+#     unreliable and untested.  It is recommended to use multifd
+#     migration, which offers an alternative compression
+#     implementation that is reliable and tested.
 #
 # @unstable: Members @x-colo and @x-ignore-shared are experimental.
 #
@@ -538,7 +545,8 @@
 ##
 { 'enum': 'MigrationCapability',
   'data': ['xbzrle', 'rdma-pin-all', 'auto-converge', 'zero-blocks',
-           'compress', 'events', 'postcopy-ram',
+           { 'name': 'compress', 'features': [ 'deprecated' ] },
+           'events', 'postcopy-ram',
            { 'name': 'x-colo', 'features': [ 'unstable' ] },
            'release-ram',
            { 'name': 'block', 'features': [ 'deprecated' ] },
@@ -844,7 +852,9 @@
 # Features:
 #
 # @deprecated: Member @block-incremental is deprecated.  Use
-#     blockdev-mirror with NBD instead.
+#     blockdev-mirror with NBD instead.  Members @compress-level,
+#     @compress-threads, @decompress-threads and @compress-wait-thread
+#     are deprecated because @compression is deprecated.
 #
 # @unstable: Members @x-checkpoint-delay and @x-vcpu-dirty-limit-period
 #     are experimental.
@@ -854,8 +864,11 @@
 { 'enum': 'MigrationParameter',
   'data': ['announce-initial', 'announce-max',
            'announce-rounds', 'announce-step',
-           'compress-level', 'compress-threads', 'decompress-threads',
-           'compress-wait-thread', 'throttle-trigger-threshold',
+           { 'name': 'compress-level', 'features': [ 'deprecated' ] },
+           { 'name': 'compress-threads', 'features': [ 'deprecated' ] },
+           { 'name': 'decompress-threads', 'features': [ 'deprecated' ] },
+           { 'name': 'compress-wait-thread', 'features': [ 'deprecated' ] },
+           'throttle-trigger-threshold',
            'cpu-throttle-initial', 'cpu-throttle-increment',
            'cpu-throttle-tailslow',
            'tls-creds', 'tls-hostname', 'tls-authz', 'max-bandwidth',
@@ -1023,7 +1036,9 @@
 # Features:
 #
 # @deprecated: Member @block-incremental is deprecated.  Use
-#     blockdev-mirror with NBD instead.
+#     blockdev-mirror with NBD instead.  Members @compress-level,
+#     @compress-threads, @decompress-threads and @compress-wait-thread
+#     are deprecated because @compression is deprecated.
 #
 # @unstable: Members @x-checkpoint-delay and @x-vcpu-dirty-limit-period
 #     are experimental.
@@ -1038,10 +1053,14 @@
             '*announce-max': 'size',
             '*announce-rounds': 'size',
             '*announce-step': 'size',
-            '*compress-level': 'uint8',
-            '*compress-threads': 'uint8',
-            '*compress-wait-thread': 'bool',
-            '*decompress-threads': 'uint8',
+            '*compress-level': { 'type': 'uint8',
+                                 'features': [ 'deprecated' ] },
+            '*compress-threads':  { 'type': 'uint8',
+                                    'features': [ 'deprecated' ] },
+            '*compress-wait-thread':  { 'type': 'bool',
+                                        'features': [ 'deprecated' ] },
+            '*decompress-threads':  { 'type': 'uint8',
+                                      'features': [ 'deprecated' ] },
             '*throttle-trigger-threshold': 'uint8',
             '*cpu-throttle-initial': 'uint8',
             '*cpu-throttle-increment': 'uint8',
@@ -1078,7 +1097,7 @@
 # Example:
 #
 # -> { "execute": "migrate-set-parameters" ,
-#      "arguments": { "compress-level": 1 } }
+#      "arguments": { "multifd-channels": 5 } }
 # <- { "return": {} }
 ##
 { 'command': 'migrate-set-parameters', 'boxed': true,
@@ -1241,7 +1260,9 @@
 # Features:
 #
 # @deprecated: Member @block-incremental is deprecated.  Use
-#     blockdev-mirror with NBD instead.
+#     blockdev-mirror with NBD instead.  Members @compress-level,
+#     @compress-threads, @decompress-threads and @compress-wait-thread
+#     are deprecated because @compression is deprecated.
 #
 # @unstable: Members @x-checkpoint-delay and @x-vcpu-dirty-limit-period
 #     are experimental.
@@ -1253,10 +1274,14 @@
             '*announce-max': 'size',
             '*announce-rounds': 'size',
             '*announce-step': 'size',
-            '*compress-level': 'uint8',
-            '*compress-threads': 'uint8',
-            '*compress-wait-thread': 'bool',
-            '*decompress-threads': 'uint8',
+            '*compress-level': { 'type': 'uint8',
+                                 'features': [ 'deprecated' ] },
+            '*compress-threads': { 'type': 'uint8',
+                                   'features': [ 'deprecated' ] },
+            '*compress-wait-thread': { 'type': 'bool',
+                                       'features': [ 'deprecated' ] },
+            '*decompress-threads': { 'type': 'uint8',
+                                     'features': [ 'deprecated' ] },
             '*throttle-trigger-threshold': 'uint8',
             '*cpu-throttle-initial': 'uint8',
             '*cpu-throttle-increment': 'uint8',
@@ -1296,10 +1321,8 @@
 #
 # -> { "execute": "query-migrate-parameters" }
 # <- { "return": {
-#          "decompress-threads": 2,
+#          "multifd-channels": 2,
 #          "cpu-throttle-increment": 10,
-#          "compress-threads": 8,
-#          "compress-level": 1,
 #          "cpu-throttle-initial": 20,
 #          "max-bandwidth": 33554432,
 #          "downtime-limit": 300
diff --git a/migration/options.c b/migration/options.c
index a753eae438..b3514af9c3 100644
--- a/migration/options.c
+++ b/migration/options.c
@@ -483,6 +483,11 @@ bool migrate_caps_check(bool *old_caps, bool *new_caps, Error **errp)
                     " use blockdev-mirror with NBD instead");
     }
 
+    if (new_caps[MIGRATION_CAPABILITY_COMPRESS]) {
+        warn_report("old compression method is deprecated;"
+                    " use multifd compression methods instead");
+    }
+
 #ifndef CONFIG_REPLICATION
     if (new_caps[MIGRATION_CAPABILITY_X_COLO]) {
         error_setg(errp, "QEMU compiled without replication module"
@@ -1321,18 +1326,26 @@ static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
     /* TODO use QAPI_CLONE() instead of duplicating it inline */
 
     if (params->has_compress_level) {
+        warn_report("old compression is deprecated;"
+                    " use multifd compression methods instead");
         s->parameters.compress_level = params->compress_level;
     }
 
     if (params->has_compress_threads) {
+        warn_report("old compression is deprecated;"
+                    " use multifd compression methods instead");
         s->parameters.compress_threads = params->compress_threads;
     }
 
     if (params->has_compress_wait_thread) {
+        warn_report("old compression is deprecated;"
+                    " use multifd compression methods instead");
         s->parameters.compress_wait_thread = params->compress_wait_thread;
     }
 
     if (params->has_decompress_threads) {
+        warn_report("old compression is deprecated;"
+                    " use multifd compression methods instead");
         s->parameters.decompress_threads = params->decompress_threads;
     }
 
-- 
2.41.0

Re: [PATCH v6 3/5] migration: migrate 'blk' command option is deprecated.

[Juan Quintela]

Juan Quintela <quintela@redhat.com> wrote:
> Use blocked-mirror with NBD instead.
>
> Signed-off-by: Juan Quintela <quintela@redhat.com>
> Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
> Reviewed-by: Thomas Huth <thuth@redhat.com>
> Reviewed-by: Markus Armbruster <armbru@redhat.com>

Hi Kevin and Stefan

Can we change the iotest output to fix this?

https://gitlab.com/juan.quintela/qemu/-/jobs/5314070229

tput mismatch (see /builds/juan.quintela/qemu/build/tests/qemu-iotests/scratch/raw-file-183/183.out.bad)
--- /builds/juan.quintela/qemu/tests/qemu-iotests/183.out
+++ /builds/juan.quintela/qemu/build/tests/qemu-iotests/scratch/raw-file-183/183.out.bad
@@ -28,6 +28,8 @@
 { 'execute': 'migrate',
        'arguments': { 'uri': 'unix:SOCK_DIR/migrate', 'blk': true } }
+warning: parameter 'blk is deprecated; use blockdev-mirror with NBD instead
+warning: block migration is deprecated; use blockdev-mirror with NBD instead
 {"return": {}}
 { 'execute': 'query-status' }
 {"return": {"status": "postmigrate", "singlestep": false, "running":
 false}}


I really want to give the warnings two users.

I guess that you want to test blk migration.

What do you recommend?

Later, Juan.

Re: [PATCH v6 2/5] migration: migrate 'inc' command option is deprecated.

[Markus Armbruster]

Juan Quintela <quintela@redhat.com> writes:

> Use blockdev-mirror with NBD instead.
>
> Reviewed-by: Thomas Huth <thuth@redhat.com>
> Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
> Reviewed-by: Markus Armbruster <armbru@redhat.com>
> Signed-off-by: Juan Quintela <quintela@redhat.com>
> ---
>  docs/about/deprecated.rst      | 9 +++++++++
>  qapi/migration.json            | 8 +++++++-
>  migration/migration-hmp-cmds.c | 5 +++++
>  migration/migration.c          | 5 +++++
>  4 files changed, 26 insertions(+), 1 deletion(-)
>
> diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst
> index 2febd2d12f..b51136f50a 100644
> --- a/docs/about/deprecated.rst
> +++ b/docs/about/deprecated.rst
> @@ -461,3 +461,12 @@ Migration
>  ``skipped`` field in Migration stats has been deprecated.  It hasn't
>  been used for more than 10 years.
>  
> +``inc`` migrate command option (since 8.2)
> +''''''''''''''''''''''''''''''''''''''''''
> +
> +Use blockdev-mirror with NBD instead.
> +
> +As an intermediate step the ``inc`` functionality can be achieved by
> +setting the ``block-incremental`` migration parameter to ``true``.
> +But this parameter is also deprecated.
> +

If you need to respin for some other reason, drop the blank line at end
of file.  Same in later patches.

[...]

Re: [PATCH v6 2/5] migration: migrate 'inc' command option is deprecated.

[Juan Quintela]

Markus Armbruster <armbru@redhat.com> wrote:
> Juan Quintela <quintela@redhat.com> writes:
>
>> Use blockdev-mirror with NBD instead.
>>
>> Reviewed-by: Thomas Huth <thuth@redhat.com>
>> Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
>> Reviewed-by: Markus Armbruster <armbru@redhat.com>
>> Signed-off-by: Juan Quintela <quintela@redhat.com>
>> ---
>>  docs/about/deprecated.rst      | 9 +++++++++
>>  qapi/migration.json            | 8 +++++++-
>>  migration/migration-hmp-cmds.c | 5 +++++
>>  migration/migration.c          | 5 +++++
>>  4 files changed, 26 insertions(+), 1 deletion(-)
>>
>> diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst
>> index 2febd2d12f..b51136f50a 100644
>> --- a/docs/about/deprecated.rst
>> +++ b/docs/about/deprecated.rst
>> @@ -461,3 +461,12 @@ Migration
>>  ``skipped`` field in Migration stats has been deprecated.  It hasn't
>>  been used for more than 10 years.
>>  
>> +``inc`` migrate command option (since 8.2)
>> +''''''''''''''''''''''''''''''''''''''''''
>> +
>> +Use blockdev-mirror with NBD instead.
>> +
>> +As an intermediate step the ``inc`` functionality can be achieved by
>> +setting the ``block-incremental`` migration parameter to ``true``.
>> +But this parameter is also deprecated.
>> +
>
> If you need to respin for some other reason, drop the blank line at end
> of file.  Same in later patches.
>
> [...]

Done.

There is a tool, git-am maybe, that complains if files don't end in a
blank line.

You can't have happy everybody.

Later, Juan.