libvirt/libvirt-qemu_migration-Restore-original-memory-locking-limit.patch

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From 8cccd9634ecd91a5b7343eddc037e0fa7de2f9f6 Mon Sep 17 00:00:00 2001
Message-Id: <8cccd9634ecd91a5b7343eddc037e0fa7de2f9f6@dist-git>
From: Jiri Denemark <jdenemar@redhat.com>
Date: Wed, 22 Jun 2022 16:12:02 +0200
Subject: [PATCH] qemu_migration: Restore original memory locking limit
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
For RDMA migration we update memory locking limit, but never set it back
once migration finishes (on the destination host) or aborts (on the
source host).
Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
(cherry picked from commit d4d3bb813031275c2c7cf72724b83c97ce82ab7a)
https://bugzilla.redhat.com/show_bug.cgi?id=2089433
Conflicts:
src/qemu/qemu_migration.c
- post-copy resovery not backported
Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
---
src/qemu/qemu_domain.c | 12 ++++++++++++
src/qemu/qemu_domain.h | 3 +++
src/qemu/qemu_migration.c | 10 ++++++++--
3 files changed, 23 insertions(+), 2 deletions(-)
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index a81789f194..c24d1e4d53 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -2389,6 +2389,11 @@ qemuDomainObjPrivateXMLFormat(virBuffer *buf,
priv->originalMemlock);
}
+ if (priv->preMigrationMemlock > 0) {
+ virBufferAsprintf(buf, "<preMigrationMemlock>%llu</preMigrationMemlock>\n",
+ priv->preMigrationMemlock);
+ }
+
return 0;
}
@@ -3117,6 +3122,13 @@ qemuDomainObjPrivateXMLParse(xmlXPathContextPtr ctxt,
goto error;
}
+ if (virXPathULongLong("string(./preMigrationMemlock)", ctxt,
+ &priv->preMigrationMemlock) == -2) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("failed to parse pre-migration memlock limit"));
+ return -1;
+ }
+
return 0;
error:
diff --git a/src/qemu/qemu_domain.h b/src/qemu/qemu_domain.h
index 6d1d23439a..d6e8a7a0fb 100644
--- a/src/qemu/qemu_domain.h
+++ b/src/qemu/qemu_domain.h
@@ -146,6 +146,9 @@ struct _qemuDomainObjPrivate {
int nbdPort; /* Port used for migration with NBD */
unsigned short migrationPort;
int preMigrationState;
+ unsigned long long preMigrationMemlock; /* Original RLIMIT_MEMLOCK in case
+ it was changed for the current
+ migration job. */
virChrdevs *devs;
diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 10338f8e87..35ad201580 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -2974,7 +2974,8 @@ qemuMigrationDstPrepareAny(virQEMUDriver *driver,
if (STREQ_NULLABLE(protocol, "rdma") &&
vm->def->mem.hard_limit > 0 &&
- qemuDomainSetMaxMemLock(vm, vm->def->mem.hard_limit << 10, NULL) < 0) {
+ qemuDomainSetMaxMemLock(vm, vm->def->mem.hard_limit << 10,
+ &priv->preMigrationMemlock) < 0) {
goto stopjob;
}
@@ -3451,6 +3452,7 @@ qemuMigrationSrcConfirmPhase(virQEMUDriver *driver,
VIR_DOMAIN_EVENT_STOPPED_MIGRATED);
virObjectEventStateQueue(driver->domainEventState, event);
qemuDomainEventEmitJobCompleted(driver, vm);
+ priv->preMigrationMemlock = 0;
} else {
virErrorPtr orig_err;
int reason;
@@ -3471,6 +3473,7 @@ qemuMigrationSrcConfirmPhase(virQEMUDriver *driver,
qemuMigrationParamsReset(driver, vm, QEMU_ASYNC_JOB_MIGRATION_OUT,
jobPriv->migParams, priv->job.apiFlags);
+ qemuDomainSetMaxMemLock(vm, 0, &priv->preMigrationMemlock);
qemuDomainSaveStatus(vm);
}
@@ -4224,7 +4227,8 @@ qemuMigrationSrcRun(virQEMUDriver *driver,
case MIGRATION_DEST_HOST:
if (STREQ(spec->dest.host.protocol, "rdma") &&
vm->def->mem.hard_limit > 0 &&
- qemuDomainSetMaxMemLock(vm, vm->def->mem.hard_limit << 10, NULL) < 0) {
+ qemuDomainSetMaxMemLock(vm, vm->def->mem.hard_limit << 10,
+ &priv->preMigrationMemlock) < 0) {
goto exit_monitor;
}
rc = qemuMonitorMigrateToHost(priv->mon, migrate_flags,
@@ -5408,6 +5412,7 @@ qemuMigrationSrcPerformPhase(virQEMUDriver *driver,
if (ret < 0) {
qemuMigrationParamsReset(driver, vm, QEMU_ASYNC_JOB_MIGRATION_OUT,
jobPriv->migParams, priv->job.apiFlags);
+ qemuDomainSetMaxMemLock(vm, 0, &priv->preMigrationMemlock);
qemuMigrationJobFinish(driver, vm);
} else {
qemuMigrationJobContinue(vm);
@@ -5881,6 +5886,7 @@ qemuMigrationDstFinish(virQEMUDriver *driver,
cleanup:
g_clear_pointer(&jobInfo, qemuDomainJobInfoFree);
virPortAllocatorRelease(port);
+ qemuDomainSetMaxMemLock(vm, 0, &priv->preMigrationMemlock);
if (priv->mon)
qemuMonitorSetDomainLog(priv->mon, NULL, NULL, NULL);
VIR_FREE(priv->origname);
--
2.35.1