[Qemu-devel] [PATCH v3 18/47] Add migration-capability boolean for postcopy-ram.

["Dr. David Alan Gilbert (git)" <dgilbert@redhat.com>]

From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
---
 include/migration/migration.h | 1 +
 migration.c                   | 9 +++++++++
 qapi-schema.json              | 6 +++++-
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/include/migration/migration.h b/include/migration/migration.h
index ff47987..0d9f62d 100644
--- a/include/migration/migration.h
+++ b/include/migration/migration.h
@@ -173,6 +173,7 @@ void migrate_add_blocker(Error *reason);
  */
 void migrate_del_blocker(Error *reason);
 
+bool migrate_postcopy_ram(void);
 bool migrate_rdma_pin_all(void);
 bool migrate_zero_blocks(void);
 
diff --git a/migration.c b/migration.c
index 1754b67..2fa128f 100644
--- a/migration.c
+++ b/migration.c
@@ -635,6 +635,15 @@ bool migrate_rdma_pin_all(void)
     return s->enabled_capabilities[MIGRATION_CAPABILITY_RDMA_PIN_ALL];
 }
 
+bool migrate_postcopy_ram(void)
+{
+    MigrationState *s;
+
+    s = migrate_get_current();
+
+    return s->enabled_capabilities[MIGRATION_CAPABILITY_X_POSTCOPY_RAM];
+}
+
 bool migrate_auto_converge(void)
 {
     MigrationState *s;
diff --git a/qapi-schema.json b/qapi-schema.json
index 341f417..77e57bd 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -491,10 +491,14 @@
 # @auto-converge: If enabled, QEMU will automatically throttle down the guest
 #          to speed up convergence of RAM migration. (since 1.6)
 #
+# @x-postcopy-ram: Start executing on the migration target before all of RAM has been
+#          migrated, pulling the remaining pages along as needed. NOTE: If the
+#          migration fails during postcopy the VM will fail.  (since 2.2)
+#
 # Since: 1.2
 ##
 { 'enum': 'MigrationCapability',
-  'data': ['xbzrle', 'rdma-pin-all', 'auto-converge', 'zero-blocks'] }
+  'data': ['xbzrle', 'rdma-pin-all', 'auto-converge', 'zero-blocks', 'x-postcopy-ram'] }
 
 ##
 # @MigrationCapabilityStatus
-- 
1.9.3