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From 34dc905251ca0f00d92e8419adc63580c6266394 Mon Sep 17 00:00:00 2001
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Message-Id: <34dc905251ca0f00d92e8419adc63580c6266394@dist-git>
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From: Jiri Denemark <jdenemar@redhat.com>
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Date: Wed, 22 Jun 2022 16:37:31 +0200
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Subject: [PATCH] qemu_migration: Implement VIR_MIGRATE_ZEROCOPY flag
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Resolves: https://gitlab.com/libvirt/libvirt/-/issues/306
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Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
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Reviewed-by: Ján Tomko <jtomko@redhat.com>
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(cherry picked from commit d375993ab314a41bca7ef6c846e07afc18c37774)
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https://bugzilla.redhat.com/show_bug.cgi?id=2117272
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Conflicts:
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src/qemu/qemu_migration.c
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src/qemu/qemu_migration.h
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- post-copy recovery not bacported
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Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
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---
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src/qemu/qemu_migration.c | 21 +++++++++++++++++++++
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src/qemu/qemu_migration.h | 1 +
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src/qemu/qemu_migration_params.c | 6 ++++++
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src/qemu/qemu_migration_params.h | 1 +
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4 files changed, 29 insertions(+)
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diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
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index 01102c4300..11f87296d6 100644
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--- a/src/qemu/qemu_migration.c
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+++ b/src/qemu/qemu_migration.c
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@@ -2366,6 +2366,12 @@ qemuMigrationSrcBeginPhase(virQEMUDriver *driver,
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return NULL;
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}
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+ if (flags & VIR_MIGRATE_ZEROCOPY && !(flags & VIR_MIGRATE_PARALLEL)) {
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+ virReportError(VIR_ERR_OPERATION_INVALID, "%s",
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+ _("zero-copy is only available for parallel migration"));
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+ return NULL;
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+ }
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+
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if (flags & (VIR_MIGRATE_NON_SHARED_DISK | VIR_MIGRATE_NON_SHARED_INC)) {
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if (flags & VIR_MIGRATE_NON_SHARED_SYNCHRONOUS_WRITES &&
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!virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKDEV)) {
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@@ -4137,6 +4143,21 @@ qemuMigrationSrcRun(virQEMUDriver *driver,
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migParams) < 0)
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goto error;
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+ if (flags & VIR_MIGRATE_ZEROCOPY) {
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+ /* Zero-copy requires pages in transfer to be locked in host memory.
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+ * Unfortunately, we have no reliable way of computing how many pages
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+ * will need to be locked at the same time. Thus we set the limit to
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+ * the whole guest memory and reset it back once migration is done. */
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+ unsigned long long limit;
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+
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+ if (virMemoryLimitIsSet(vm->def->mem.hard_limit))
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+ limit = vm->def->mem.hard_limit;
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+ else
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+ limit = virDomainDefGetMemoryTotal(vm->def);
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+
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+ if (qemuDomainSetMaxMemLock(vm, limit << 10, &priv->preMigrationMemlock) < 0)
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+ goto error;
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+ }
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if (storageMigration) {
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if (mig->nbd) {
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diff --git a/src/qemu/qemu_migration.h b/src/qemu/qemu_migration.h
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index b233358a51..6f737f7b4c 100644
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--- a/src/qemu/qemu_migration.h
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+++ b/src/qemu/qemu_migration.h
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@@ -60,6 +60,7 @@
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VIR_MIGRATE_TLS | \
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VIR_MIGRATE_PARALLEL | \
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VIR_MIGRATE_NON_SHARED_SYNCHRONOUS_WRITES | \
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+ VIR_MIGRATE_ZEROCOPY | \
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0)
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/* All supported migration parameters and their types. */
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diff --git a/src/qemu/qemu_migration_params.c b/src/qemu/qemu_migration_params.c
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index 7b225fdf4b..c985583861 100644
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--- a/src/qemu/qemu_migration_params.c
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+++ b/src/qemu/qemu_migration_params.c
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@@ -96,6 +96,7 @@ VIR_ENUM_IMPL(qemuMigrationCapability,
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"multifd",
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"dirty-bitmaps",
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"return-path",
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+ "zero-copy-send",
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);
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@@ -177,6 +178,11 @@ static const qemuMigrationParamsFlagMapItem qemuMigrationParamsFlagMap[] = {
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VIR_MIGRATE_TUNNELLED,
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QEMU_MIGRATION_CAP_RETURN_PATH,
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QEMU_MIGRATION_SOURCE | QEMU_MIGRATION_DESTINATION},
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+
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+ {QEMU_MIGRATION_FLAG_REQUIRED,
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+ VIR_MIGRATE_ZEROCOPY,
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+ QEMU_MIGRATION_CAP_ZERO_COPY_SEND,
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+ QEMU_MIGRATION_SOURCE},
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};
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/* Translation from VIR_MIGRATE_PARAM_* typed parameters to
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diff --git a/src/qemu/qemu_migration_params.h b/src/qemu/qemu_migration_params.h
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index b4de8dda7b..caa5e47f0f 100644
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--- a/src/qemu/qemu_migration_params.h
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+++ b/src/qemu/qemu_migration_params.h
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@@ -41,6 +41,7 @@ typedef enum {
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QEMU_MIGRATION_CAP_MULTIFD,
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QEMU_MIGRATION_CAP_BLOCK_DIRTY_BITMAPS,
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QEMU_MIGRATION_CAP_RETURN_PATH,
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+ QEMU_MIGRATION_CAP_ZERO_COPY_SEND,
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QEMU_MIGRATION_CAP_LAST
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} qemuMigrationCapability;
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--
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2.35.1
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