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qemu_migration: Implement VIR_MIGRATE_ZEROCOPY flag

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Resolves: https://gitlab.com/libvirt/libvirt/-/issues/306

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Jiri Denemark 2022-06-22 16:37:31 +02:00
parent efa3baeae7
commit d375993ab3
4 changed files with 29 additions and 0 deletions
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21
src/qemu/qemu_migration.c
View File

@ -2634,6 +2634,12 @@ qemuMigrationSrcBeginPhase(virQEMUDriver *driver,
}
}
if (flags & VIR_MIGRATE_ZEROCOPY && !(flags & VIR_MIGRATE_PARALLEL)) {
virReportError(VIR_ERR_OPERATION_INVALID, "%s",
_("zero-copy is only available for parallel migration"));
return NULL;
}
if (flags & (VIR_MIGRATE_NON_SHARED_DISK | VIR_MIGRATE_NON_SHARED_INC)) {
if (flags & VIR_MIGRATE_NON_SHARED_SYNCHRONOUS_WRITES &&
!virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKDEV)) {
@ -4798,6 +4804,21 @@ qemuMigrationSrcRun(virQEMUDriver *driver,
migParams) < 0)
goto error;
if (flags & VIR_MIGRATE_ZEROCOPY) {
/* Zero-copy requires pages in transfer to be locked in host memory.
* Unfortunately, we have no reliable way of computing how many pages
* will need to be locked at the same time. Thus we set the limit to
* the whole guest memory and reset it back once migration is done. */
unsigned long long limit;
if (virMemoryLimitIsSet(vm->def->mem.hard_limit))
limit = vm->def->mem.hard_limit;
else
limit = virDomainDefGetMemoryTotal(vm->def);
if (qemuDomainSetMaxMemLock(vm, limit << 10, &priv->preMigrationMemlock) < 0)
goto error;
}
if (storageMigration) {
if (mig->nbd) {

1
src/qemu/qemu_migration.h
View File

@ -61,6 +61,7 @@
VIR_MIGRATE_PARALLEL | \
VIR_MIGRATE_NON_SHARED_SYNCHRONOUS_WRITES | \
VIR_MIGRATE_POSTCOPY_RESUME | \
VIR_MIGRATE_ZEROCOPY | \
0)
/* All supported migration parameters and their types. */

6
src/qemu/qemu_migration_params.c
View File

@ -94,6 +94,7 @@ VIR_ENUM_IMPL(qemuMigrationCapability,
"multifd",
"dirty-bitmaps",
"return-path",
"zero-copy-send",
);
@ -175,6 +176,11 @@ static const qemuMigrationParamsFlagMapItem qemuMigrationParamsFlagMap[] = {
VIR_MIGRATE_TUNNELLED,
QEMU_MIGRATION_CAP_RETURN_PATH,
QEMU_MIGRATION_SOURCE | QEMU_MIGRATION_DESTINATION},
{QEMU_MIGRATION_FLAG_REQUIRED,
VIR_MIGRATE_ZEROCOPY,
QEMU_MIGRATION_CAP_ZERO_COPY_SEND,
QEMU_MIGRATION_SOURCE},
};
/* Translation from VIR_MIGRATE_PARAM_* typed parameters to

1
src/qemu/qemu_migration_params.h
View File

@ -39,6 +39,7 @@ typedef enum {
QEMU_MIGRATION_CAP_MULTIFD,
QEMU_MIGRATION_CAP_BLOCK_DIRTY_BITMAPS,
QEMU_MIGRATION_CAP_RETURN_PATH,
QEMU_MIGRATION_CAP_ZERO_COPY_SEND,
QEMU_MIGRATION_CAP_LAST
} qemuMigrationCapability;