qemu: Implement virDomainMigrateStartPostCopy

Signed-off-by: Cristian Klein <cristiklein@gmail.com>
Signed-off-by: Jiri Denemark <jdenemar@redhat.com>

src/qemu/qemu_domain.c

@@ -214,6 +214,7 @@ qemuDomainObjResetAsyncJob(qemuDomainObjPrivatePtr priv)
     job->dump_memory_only = false;
     job->abortJob = false;
     job->spiceMigrated = false;
+    job->postcopyEnabled = false;
     VIR_FREE(job->current);
 }
 

src/qemu/qemu_domain.h

@@ -141,6 +141,7 @@ struct qemuDomainJobObj {
     bool spiceMigration;                /* we asked for spice migration and we
                                          * should wait for it to finish */
     bool spiceMigrated;                 /* spice migration completed */
+    bool postcopyEnabled;               /* post-copy migration was enabled */
 };
 
 typedef void (*qemuDomainCleanupCallback)(virQEMUDriverPtr driver,

src/qemu/qemu_driver.c

@@ -13370,6 +13370,63 @@ qemuDomainMigrateGetMaxSpeed(virDomainPtr dom,
 }
 
 
+static int
+qemuDomainMigrateStartPostCopy(virDomainPtr dom,
+                               unsigned int flags)
+{
+    virQEMUDriverPtr driver = dom->conn->privateData;
+    virDomainObjPtr vm;
+    qemuDomainObjPrivatePtr priv;
+    int ret = -1;
+
+    virCheckFlags(0, -1);
+
+    if (!(vm = qemuDomObjFromDomain(dom)))
+        goto cleanup;
+
+    if (virDomainMigrateStartPostCopyEnsureACL(dom->conn, vm->def) < 0)
+        goto cleanup;
+
+    if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MIGRATION_OP) < 0)
+        goto cleanup;
+
+    if (!virDomainObjIsActive(vm)) {
+        virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+                       _("domain is not running"));
+        goto endjob;
+    }
+
+    priv = vm->privateData;
+
+    if (priv->job.asyncJob != QEMU_ASYNC_JOB_MIGRATION_OUT) {
+        virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+                       _("post-copy can only be started while "
+                         "outgoing migration is in progress"));
+        goto endjob;
+    }
+
+    if (!priv->job.postcopyEnabled) {
+        virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+                       _("switching to post-copy requires migration to be "
+                         "started with VIR_MIGRATE_POSTCOPY flag"));
+        goto endjob;
+    }
+
+    VIR_DEBUG("Starting post-copy");
+    qemuDomainObjEnterMonitor(driver, vm);
+    ret = qemuMonitorMigrateStartPostCopy(priv->mon);
+    if (qemuDomainObjExitMonitor(driver, vm) < 0)
+        ret = -1;
+
+ endjob:
+    qemuDomainObjEndJob(driver, vm);
+
+ cleanup:
+    virDomainObjEndAPI(&vm);
+    return ret;
+}
+
+
 typedef enum {
     VIR_DISK_CHAIN_NO_ACCESS,
     VIR_DISK_CHAIN_READ_ONLY,
@@ -20196,6 +20253,7 @@ static virHypervisorDriver qemuHypervisorDriver = {
     .domainInterfaceAddresses = qemuDomainInterfaceAddresses, /* 1.2.14 */
     .domainSetUserPassword = qemuDomainSetUserPassword, /* 1.2.16 */
     .domainRename = qemuDomainRename, /* 1.2.19 */
+    .domainMigrateStartPostCopy = qemuDomainMigrateStartPostCopy, /* 1.3.3 */
 };
 
 

src/qemu/qemu_migration.c

@@ -2426,11 +2426,14 @@ qemuMigrationSetPostCopy(virQEMUDriverPtr driver,
                          bool state,
                          qemuDomainAsyncJob job)
 {
+    qemuDomainObjPrivatePtr priv = vm->privateData;
+
     if (qemuMigrationSetOption(driver, vm,
                                QEMU_MONITOR_MIGRATION_CAPS_POSTCOPY,
                                state, job) < 0)
         return -1;
 
+    priv->job.postcopyEnabled = state;
     return 0;
 }