Merge tag 'migration-20231102-pull-request' of https://gitlab.com/juan.quintela/qemu into staging

Migration Pull request (20231102)

Hi

In this pull request:

- migration reboot mode (steve)
  * I disabled the test because our CI don't like programs using so
    much shared memory.  Searching for a fix.
- test for postcopy recover (fabiano)
- MigrateAddress QAPI (het)
- better return path error handling (peter)
- traces for downtime (peter)
- vmstate_register() check for duplicates (juan)
  thomas find better solutions for s390x and ipmi.
  now also works on s390x

Please, apply.

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# gpg:                using RSA key 1899FF8EDEBF58CCEE034B82F487EF185872D723
# gpg: Good signature from "Juan Quintela <quintela@redhat.com>" [full]
# gpg:                 aka "Juan Quintela <quintela@trasno.org>" [full]
# Primary key fingerprint: 1899 FF8E DEBF 58CC EE03  4B82 F487 EF18 5872 D723

* tag 'migration-20231102-pull-request' of https://gitlab.com/juan.quintela/qemu: (40 commits)
  migration: modify test_multifd_tcp_none() to use new QAPI syntax.
  migration: Implement MigrateChannelList to hmp migration flow.
  migration: Implement MigrateChannelList to qmp migration flow.
  migration: modify migration_channels_and_uri_compatible() for new QAPI syntax
  migration: New migrate and migrate-incoming argument 'channels'
  migration: Convert the file backend to the new QAPI syntax
  migration: convert exec backend to accept MigrateAddress.
  migration: convert rdma backend to accept MigrateAddress
  migration: convert socket backend to accept MigrateAddress
  migration: convert migration 'uri' into 'MigrateAddress'
  migration: New QAPI type 'MigrateAddress'
  migration: Change ram_dirty_bitmap_reload() retval to bool
  tests/migration-test: Add a test for postcopy hangs during RECOVER
  migration: Allow network to fail even during recovery
  migration: Refactor error handling in source return path
  tests/qtest: migration: add reboot mode test
  cpr: reboot mode
  cpr: relax vhost migration blockers
  cpr: relax blockdev migration blockers
  migration: per-mode blockers
  ...

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

3 files changed, 69 insertions, 4 deletions

diff --git a/include/migration/blocker.h b/include/migration/blocker.h
index b048f301b4..a687ac0efe 100644
--- a/include/migration/blocker.h
+++ b/include/migration/blocker.h
@@ -14,8 +14,12 @@
 #ifndef MIGRATION_BLOCKER_H
 #define MIGRATION_BLOCKER_H
 
+#include "qapi/qapi-types-migration.h"
+
+#define MIG_MODE_ALL MIG_MODE__MAX
+
 /**
- * @migrate_add_blocker - prevent migration from proceeding
+ * @migrate_add_blocker - prevent all modes of migration from proceeding
  *
  * @reasonp - address of an error to be returned whenever migration is attempted
  *
@@ -30,8 +34,8 @@
 int migrate_add_blocker(Error **reasonp, Error **errp);
 
 /**
- * @migrate_add_blocker_internal - prevent migration from proceeding without
- *                                 only-migrate implications
+ * @migrate_add_blocker_internal - prevent all modes of migration from
+ *                                 proceeding, but ignore -only-migratable
  *
  * @reasonp - address of an error to be returned whenever migration is attempted
  *
@@ -50,7 +54,7 @@ int migrate_add_blocker(Error **reasonp, Error **errp);
 int migrate_add_blocker_internal(Error **reasonp, Error **errp);
 
 /**
- * @migrate_del_blocker - remove a blocking error from migration and free it.
+ * @migrate_del_blocker - remove a migration blocker from all modes and free it.
  *
  * @reasonp - address of the error blocking migration
  *
@@ -58,4 +62,36 @@ int migrate_add_blocker_internal(Error **reasonp, Error **errp);
  */
 void migrate_del_blocker(Error **reasonp);
 
+/**
+ * @migrate_add_blocker_normal - prevent normal migration mode from proceeding
+ *
+ * @reasonp - address of an error to be returned whenever migration is attempted
+ *
+ * @errp - [out] The reason (if any) we cannot block migration right now.
+ *
+ * @returns - 0 on success, -EBUSY/-EACCES on failure, with errp set.
+ *
+ * *@reasonp is freed and set to NULL if failure is returned.
+ * On success, the caller must not free @reasonp, except by
+ *   calling migrate_del_blocker.
+ */
+int migrate_add_blocker_normal(Error **reasonp, Error **errp);
+
+/**
+ * @migrate_add_blocker_modes - prevent some modes of migration from proceeding
+ *
+ * @reasonp - address of an error to be returned whenever migration is attempted
+ *
+ * @errp - [out] The reason (if any) we cannot block migration right now.
+ *
+ * @mode - one or more migration modes to be blocked.  The list is terminated
+ *         by -1 or MIG_MODE_ALL.  For the latter, all modes are blocked.
+ *
+ * @returns - 0 on success, -EBUSY/-EACCES on failure, with errp set.
+ *
+ * *@reasonp is freed and set to NULL if failure is returned.
+ * On success, the caller must not free *@reasonp before the blocker is removed.
+ */
+int migrate_add_blocker_modes(Error **reasonp, Error **errp, MigMode mode, ...);
+
 #endif
diff --git a/include/migration/misc.h b/include/migration/misc.h
index 673ac490fb..1bc8902e6d 100644
--- a/include/migration/misc.h
+++ b/include/migration/misc.h
@@ -15,6 +15,7 @@
 #define MIGRATION_MISC_H
 
 #include "qemu/notify.h"
+#include "qapi/qapi-types-migration.h"
 #include "qapi/qapi-types-net.h"
 
 /* migration/ram.c */
diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
index 1af181877c..9821918631 100644
--- a/include/migration/vmstate.h
+++ b/include/migration/vmstate.h
@@ -1230,6 +1230,34 @@ static inline int vmstate_register(VMStateIf *obj, int instance_id,
                                           opaque, -1, 0, NULL);
 }
 
+/**
+ * vmstate_replace_hack_for_ppc() - ppc used to abuse vmstate_register
+ *
+ * Don't even think about using this function in new code.
+ *
+ * Returns: 0 on success, -1 on failure
+ */
+int vmstate_replace_hack_for_ppc(VMStateIf *obj, int instance_id,
+                                 const VMStateDescription *vmsd,
+                                 void *opaque);
+
+/**
+ * vmstate_register_any() - legacy function to register state
+ * serialisation description and let the function choose the id
+ *
+ * New code shouldn't be using this function as QOM-ified devices have
+ * dc->vmsd to store the serialisation description.
+ *
+ * Returns: 0 on success, -1 on failure
+ */
+static inline int vmstate_register_any(VMStateIf *obj,
+                                       const VMStateDescription *vmsd,
+                                       void *opaque)
+{
+    return vmstate_register_with_alias_id(obj, VMSTATE_INSTANCE_ID_ANY, vmsd,
+                                          opaque, -1, 0, NULL);
+}
+
 void vmstate_unregister(VMStateIf *obj, const VMStateDescription *vmsd,
                         void *opaque);