[PATCH 7/9] qemu: support instant mode in qemuMigrationSrcToFile
Nikolay Shirokovskiy
nshirokovskiy at virtuozzo.com
Thu Nov 11 08:55:52 UTC 2021
We only need to turn QEMU_MIGRATION_CAP_BACKGROUND_SNAPSHOT migration
capabiliti for this.
Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy at virtuozzo.com>
---
src/qemu/qemu_driver.c | 4 ++--
src/qemu/qemu_migration.c | 20 +++++++++++++++-----
src/qemu/qemu_migration.h | 1 +
src/qemu/qemu_migration_params.c | 1 +
src/qemu/qemu_migration_params.h | 1 +
src/qemu/qemu_saveimage.c | 3 ++-
src/qemu/qemu_saveimage.h | 1 +
src/qemu/qemu_snapshot.c | 5 +++--
8 files changed, 26 insertions(+), 10 deletions(-)
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 6a77d9f513..8edc38d343 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -2855,7 +2855,7 @@ qemuDomainSaveInternal(virQEMUDriver *driver,
xml = NULL;
ret = qemuSaveImageCreate(driver, vm, path, data, compressor,
- flags, QEMU_ASYNC_JOB_SAVE);
+ flags, false, QEMU_ASYNC_JOB_SAVE);
if (ret < 0)
goto endjob;
@@ -3238,7 +3238,7 @@ doCoreDump(virQEMUDriver *driver,
if (!qemuMigrationSrcIsAllowed(driver, vm, false, 0))
goto cleanup;
- rc = qemuMigrationSrcToFile(driver, vm, fd, compressor,
+ rc = qemuMigrationSrcToFile(driver, vm, fd, compressor, false,
QEMU_ASYNC_JOB_DUMP);
}
diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 9729041846..18a01df3d0 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -5898,6 +5898,7 @@ int
qemuMigrationSrcToFile(virQEMUDriver *driver, virDomainObj *vm,
int fd,
virCommand *compressor,
+ bool instant,
qemuDomainAsyncJob asyncJob)
{
qemuDomainObjPrivate *priv = vm->privateData;
@@ -5924,6 +5925,11 @@ qemuMigrationSrcToFile(virQEMUDriver *driver, virDomainObj *vm,
QEMU_DOMAIN_MIG_BANDWIDTH_MAX * 1024 * 1024) < 0)
return -1;
+ if (instant)
+ qemuMigrationParamsSetCapability(migParams,
+ QEMU_MIGRATION_CAP_BACKGROUND_SNAPSHOT,
+ true);
+
if (qemuMigrationParamsApply(driver, vm, asyncJob, migParams) < 0)
return -1;
@@ -6018,11 +6024,15 @@ qemuMigrationSrcToFile(virQEMUDriver *driver, virDomainObj *vm,
/* Restore max migration bandwidth */
if (virDomainObjIsActive(vm)) {
if (bwParam) {
- if (qemuMigrationParamsSetULL(migParams,
- QEMU_MIGRATION_PARAM_MAX_BANDWIDTH,
- saveMigBandwidth * 1024 * 1024) == 0)
- ignore_value(qemuMigrationParamsApply(driver, vm, asyncJob,
- migParams));
+ qemuMigrationParamsSetULL(migParams,
+ QEMU_MIGRATION_PARAM_MAX_BANDWIDTH,
+ saveMigBandwidth * 1024 * 1024);
+ if (instant)
+ qemuMigrationParamsSetCapability(migParams,
+ QEMU_MIGRATION_CAP_BACKGROUND_SNAPSHOT,
+ false);
+ ignore_value(qemuMigrationParamsApply(driver, vm, asyncJob,
+ migParams));
} else {
if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) == 0) {
qemuMonitorSetMigrationSpeed(priv->mon, saveMigBandwidth);
diff --git a/src/qemu/qemu_migration.h b/src/qemu/qemu_migration.h
index dd74f8bc88..9d91fbc882 100644
--- a/src/qemu/qemu_migration.h
+++ b/src/qemu/qemu_migration.h
@@ -209,6 +209,7 @@ qemuMigrationSrcToFile(virQEMUDriver *driver,
virDomainObj *vm,
int fd,
virCommand *compressor,
+ bool instant,
qemuDomainAsyncJob asyncJob)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) G_GNUC_WARN_UNUSED_RESULT;
diff --git a/src/qemu/qemu_migration_params.c b/src/qemu/qemu_migration_params.c
index 11081dc11c..148aa2d12d 100644
--- a/src/qemu/qemu_migration_params.c
+++ b/src/qemu/qemu_migration_params.c
@@ -90,6 +90,7 @@ VIR_ENUM_IMPL(qemuMigrationCapability,
"late-block-activate",
"multifd",
"dirty-bitmaps",
+ "background-snapshot",
);
diff --git a/src/qemu/qemu_migration_params.h b/src/qemu/qemu_migration_params.h
index 5ca171226f..844ebf92eb 100644
--- a/src/qemu/qemu_migration_params.h
+++ b/src/qemu/qemu_migration_params.h
@@ -40,6 +40,7 @@ typedef enum {
QEMU_MIGRATION_CAP_LATE_BLOCK_ACTIVATE,
QEMU_MIGRATION_CAP_MULTIFD,
QEMU_MIGRATION_CAP_BLOCK_DIRTY_BITMAPS,
+ QEMU_MIGRATION_CAP_BACKGROUND_SNAPSHOT,
QEMU_MIGRATION_CAP_LAST
} qemuMigrationCapability;
diff --git a/src/qemu/qemu_saveimage.c b/src/qemu/qemu_saveimage.c
index e03b79c303..b2b48610e6 100644
--- a/src/qemu/qemu_saveimage.c
+++ b/src/qemu/qemu_saveimage.c
@@ -258,6 +258,7 @@ qemuSaveImageCreate(virQEMUDriver *driver,
virQEMUSaveData *data,
virCommand *compressor,
unsigned int flags,
+ bool instant,
qemuDomainAsyncJob asyncJob)
{
g_autoptr(virQEMUDriverConfig) cfg = virQEMUDriverGetConfig(driver);
@@ -295,7 +296,7 @@ qemuSaveImageCreate(virQEMUDriver *driver,
goto cleanup;
/* Perform the migration */
- if (qemuMigrationSrcToFile(driver, vm, fd, compressor, asyncJob) < 0)
+ if (qemuMigrationSrcToFile(driver, vm, fd, compressor, instant, asyncJob) < 0)
goto cleanup;
/* Touch up file header to mark image complete. */
diff --git a/src/qemu/qemu_saveimage.h b/src/qemu/qemu_saveimage.h
index 0710426742..2e87d6485a 100644
--- a/src/qemu/qemu_saveimage.h
+++ b/src/qemu/qemu_saveimage.h
@@ -96,6 +96,7 @@ qemuSaveImageCreate(virQEMUDriver *driver,
virQEMUSaveData *data,
virCommand *compressor,
unsigned int flags,
+ bool instant,
qemuDomainAsyncJob asyncJob);
int
diff --git a/src/qemu/qemu_snapshot.c b/src/qemu/qemu_snapshot.c
index 7e4dadb876..b521634f2a 100644
--- a/src/qemu/qemu_snapshot.c
+++ b/src/qemu/qemu_snapshot.c
@@ -1344,6 +1344,7 @@ qemuSnapshotSaveMemory(virQEMUDriver *driver,
virDomainObj *vm,
virDomainSnapshotDef *snapdef,
bool running,
+ bool instant,
virQEMUDriverConfig *cfg)
{
qemuDomainObjPrivate *priv = vm->privateData;
@@ -1377,7 +1378,7 @@ qemuSnapshotSaveMemory(virQEMUDriver *driver,
xml = NULL;
if (qemuSaveImageCreate(driver, vm, snapdef->memorysnapshotfile,
- data, compressor, 0,
+ data, compressor, 0, instant,
QEMU_ASYNC_JOB_SNAPSHOT) < 0)
return -1;
@@ -1471,7 +1472,7 @@ qemuSnapshotCreateActiveExternal(virQEMUDriver *driver,
if (memory) {
memory_existing = virFileExists(snapdef->memorysnapshotfile);
- if (qemuSnapshotSaveMemory(driver, vm, snapdef, resume, cfg) < 0)
+ if (qemuSnapshotSaveMemory(driver, vm, snapdef, resume, false, cfg) < 0)
goto cleanup;
/* the memory image was created, remove it on errors */
--
2.27.0
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