qemu: Set always-on migration caps in ParamsCheck

Some migration capabilities are always enabled if QEMU supports them. We
can just drop the explicit code for them and let
qemuMigrationParamsCheck automatically set such capabilities.

QEMU_MONITOR_MIGRATION_CAPS_EVENTS would normally be one of the always
on features, but it is the only feature we want to enable even for other
jobs which internally use migration (such as save and snapshot). Hence
this capability is set very early after libvirtd connects to QEMU
monitor.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 400eb0710c39900c349a8aee73fde0f038b8174c..0446003f479eccefef6e62b6279f0c50a106f68a 100644 (file)
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -3359,12 +3359,6 @@ qemuMigrationSrcRun(virQEMUDriverPtr driver,
                                          migParams) < 0)
         goto error;
 
-    if (qemuMigrationCapsGet(vm, QEMU_MONITOR_MIGRATION_CAPS_PAUSE_BEFORE_SWITCHOVER) &&
-        qemuMigrationParamsSetCapability(vm,
-                                         QEMU_MONITOR_MIGRATION_CAPS_PAUSE_BEFORE_SWITCHOVER,
-                                         true, migParams) < 0)
-        goto error;
-
     if (qemuMigrationParamsCheck(driver, vm, QEMU_ASYNC_JOB_MIGRATION_OUT,
                                  migParams) < 0)
         goto error;

diff --git a/src/qemu/qemu_migration_params.c b/src/qemu/qemu_migration_params.c
index bf95fb4f591471b54e5f88e9348e5933d2cd96ec..03056eed09bf2d1ac97ea5431502e481be921458 100644 (file)
--- a/src/qemu/qemu_migration_params.c
+++ b/src/qemu/qemu_migration_params.c
@@ -43,6 +43,19 @@ struct _qemuMigrationParams {
     qemuMonitorMigrationParams params;
 };
 
+typedef struct _qemuMigrationParamsAlwaysOnItem qemuMigrationParamsAlwaysOnItem;
+struct _qemuMigrationParamsAlwaysOnItem {
+    qemuMonitorMigrationCaps cap;
+    int party; /* bit-wise OR of qemuMigrationParty */
+};
+
+/* Migration capabilities which should always be enabled as long as they
+ * are supported by QEMU. */
+static const qemuMigrationParamsAlwaysOnItem qemuMigrationParamsAlwaysOn[] = {
+    {QEMU_MONITOR_MIGRATION_CAPS_PAUSE_BEFORE_SWITCHOVER,
+     QEMU_MIGRATION_SOURCE},
+};
+
 
 static qemuMigrationParamsPtr
 qemuMigrationParamsNew(void)
@@ -399,8 +412,15 @@ qemuMigrationParamsCheck(virQEMUDriverPtr driver,
     qemuDomainObjPrivatePtr priv = vm->privateData;
     qemuMigrationParamsPtr origParams = NULL;
     qemuMonitorMigrationCaps cap;
+    qemuMigrationParty party;
+    size_t i;
     int ret = -1;
 
+    if (asyncJob == QEMU_ASYNC_JOB_MIGRATION_OUT)
+        party = QEMU_MIGRATION_SOURCE;
+    else
+        party = QEMU_MIGRATION_DESTINATION;
+
     for (cap = 0; cap < QEMU_MONITOR_MIGRATION_CAPS_LAST; cap++) {
         bool state = false;
 
@@ -414,6 +434,17 @@ qemuMigrationParamsCheck(virQEMUDriverPtr driver,
         }
     }
 
+    for (i = 0; i < ARRAY_CARDINALITY(qemuMigrationParamsAlwaysOn); i++) {
+        cap = qemuMigrationParamsAlwaysOn[i].cap;
+
+        if (qemuMigrationParamsAlwaysOn[i].party & party &&
+            qemuMigrationCapsGet(vm, cap)) {
+            VIR_DEBUG("Enabling migration capability '%s'",
+                      qemuMonitorMigrationCapsTypeToString(cap));
+            ignore_value(virBitmapSetBit(migParams->caps, cap));
+        }
+    }
+
     if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
         return -1;