[libvirt] [PATCH v2 4/8] Implemented VIR_MIGRATE_POSTCOPY in qemu driver
Signed-off-by: Cristian Klein <cristian.klein(a)cs.umu.se>
---
src/qemu/qemu_migration.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++
src/qemu/qemu_migration.h | 3 ++-
2 files changed, 62 insertions(+), 1 deletion(-)
diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 284cd5a..4a36946 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -1801,6 +1801,49 @@ qemuMigrationSetOffline(virQEMUDriverPtr driver,
static int
+qemuMigrationSetPostCopy(virQEMUDriverPtr driver,
+ virDomainObjPtr vm,
+ qemuDomainAsyncJob job)
+{
+ qemuDomainObjPrivatePtr priv = vm->privateData;
+ int ret;
+
+ if (qemuDomainObjEnterMonitorAsync(driver, vm, job) < 0)
+ return -1;
+
+ ret = qemuMonitorGetMigrationCapability(
+ priv->mon,
+ QEMU_MONITOR_MIGRATION_CAPS_POSTCOPY);
+
+ if (ret < 0) {
+ goto cleanup;
+ } else if (ret == 0) {
+ if (job == QEMU_ASYNC_JOB_MIGRATION_IN) {
+ virReportError(VIR_ERR_ARGUMENT_UNSUPPORTED, "%s",
+ _("Post-copy migration is not supported by "
+ "target QEMU binary"));
+ } else {
+ virReportError(VIR_ERR_ARGUMENT_UNSUPPORTED, "%s",
+ _("Post-copy migration is not supported by "
+ "source QEMU binary"));
+ }
+ ret = -1;
+ goto cleanup;
+ }
+
+ /* Post-copy only needs to be enabled on source qemu,
+ * for target, this function only acts as a capability check */
+ if (job == QEMU_ASYNC_JOB_MIGRATION_OUT) {
+ ret = qemuMonitorSetMigrationCapability(
+ priv->mon,
+ QEMU_MONITOR_MIGRATION_CAPS_POSTCOPY);
+ }
+
+ cleanup:
+ qemuDomainObjExitMonitor(driver, vm);
+ return ret;
+}
+static int
qemuMigrationSetCompression(virQEMUDriverPtr driver,
virDomainObjPtr vm,
qemuDomainAsyncJob job)
@@ -2741,6 +2784,11 @@ qemuMigrationPrepareAny(virQEMUDriverPtr driver,
dataFD[1] = -1; /* 'st' owns the FD now & will close it */
}
+ if (flags & VIR_MIGRATE_POSTCOPY &&
+ qemuMigrationSetPostCopy(driver, vm,
+ QEMU_ASYNC_JOB_MIGRATION_IN) < 0)
+ goto stop;
+
if (flags & VIR_MIGRATE_COMPRESSED &&
qemuMigrationSetCompression(driver, vm,
QEMU_ASYNC_JOB_MIGRATION_IN) < 0)
@@ -3583,6 +3631,18 @@ qemuMigrationRun(virQEMUDriverPtr driver,
QEMU_ASYNC_JOB_MIGRATION_OUT) < 0)
goto cleanup;
+ if (flags & VIR_MIGRATE_POSTCOPY) {
+ if (!(flags & VIR_MIGRATE_LIVE)) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("Enabling post-copy only makes sense with "
+ "live migration"));
+ goto cleanup;
+ }
+ if (qemuMigrationSetPostCopy(driver, vm,
+ QEMU_ASYNC_JOB_MIGRATION_OUT) < 0)
+ goto cleanup;
+ }
+
if (qemuDomainObjEnterMonitorAsync(driver, vm,
QEMU_ASYNC_JOB_MIGRATION_OUT) < 0)
goto cleanup;
diff --git a/src/qemu/qemu_migration.h b/src/qemu/qemu_migration.h
index e7a90c3..349c9c4 100644
--- a/src/qemu/qemu_migration.h
+++ b/src/qemu/qemu_migration.h
@@ -41,7 +41,8 @@
VIR_MIGRATE_COMPRESSED | \
VIR_MIGRATE_ABORT_ON_ERROR | \
VIR_MIGRATE_AUTO_CONVERGE | \
- VIR_MIGRATE_RDMA_PIN_ALL)
+ VIR_MIGRATE_RDMA_PIN_ALL | \
+ VIR_MIGRATE_POSTCOPY)
/* All supported migration parameters and their types. */
# define QEMU_MIGRATION_PARAMETERS \
--
1.9.1