libvirt/libvirt-qemu-Restore-original-memory-locking-limit-on-reconnect.patch

From a1d825e5dcb8cbe0854fa852d25e5997a52d57cd Mon Sep 17 00:00:00 2001
Message-Id: <a1d825e5dcb8cbe0854fa852d25e5997a52d57cd@dist-git>
From: Jiri Denemark <jdenemar@redhat.com>
Date: Wed, 27 Jul 2022 14:33:23 +0200
Subject: [PATCH] qemu: Restore original memory locking limit on reconnect

Commit v8.4.0-287-gd4d3bb8130 tried to make sure the original
pre-migration memory locking limit is restored at the end of migration,
but it missed the case when libvirt daemon is restarted during
migration which needs to be aborted on reconnect.

And if this was not enough, I forgot to actually save the status XML
after setting the field in priv (in the commit mentioned above and also
in v8.4.0-291-gd375993ab3).

https://bugzilla.redhat.com/show_bug.cgi?id=2107424

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
(cherry picked from commit bb9badb9168ad0d40bca86b6463ef504624f096d)

Conflicts:
	src/qemu/qemu_migration.c
            - commit v8.5.0-2-gf9dcc01a0f not backported

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
---
 src/qemu/qemu_migration.c | 13 +++++++++----
 src/qemu/qemu_process.c   |  2 ++
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 9289df81eb..61fcaf4258 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -4672,10 +4672,12 @@ qemuMigrationSrcStart(virDomainObj *vm,
     switch (spec->destType) {
     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,
-                                    &priv->preMigrationMemlock) < 0) {
-            return -1;
+            vm->def->mem.hard_limit > 0) {
+            if (qemuDomainSetMaxMemLock(vm, vm->def->mem.hard_limit << 10,
+                                        &priv->preMigrationMemlock) < 0)
+                return -1;
+            /* Store the original memory locking limit */
+            qemuDomainSaveStatus(vm);
         }
         return qemuMonitorMigrateToHost(priv->mon, migrateFlags,
                                         spec->dest.host.protocol,
@@ -4870,6 +4872,9 @@ qemuMigrationSrcRun(virQEMUDriver *driver,
 
         if (qemuDomainSetMaxMemLock(vm, limit << 10, &priv->preMigrationMemlock) < 0)
             goto error;
+
+        /* Store the original memory locking limit */
+        qemuDomainSaveStatus(vm);
     }
 
     if (storageMigration) {
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 771a623ef7..1c28d4b102 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -3677,6 +3677,7 @@ qemuProcessRecoverMigration(virQEMUDriver *driver,
 {
     virDomainJobStatus migStatus = VIR_DOMAIN_JOB_STATUS_NONE;
     qemuDomainJobPrivate *jobPriv = job->privateData;
+    qemuDomainObjPrivate *priv = vm->privateData;
     virDomainState state;
     int reason;
     int rc;
@@ -3726,6 +3727,7 @@ qemuProcessRecoverMigration(virQEMUDriver *driver,
 
     qemuMigrationParamsReset(driver, vm, VIR_ASYNC_JOB_NONE,
                              jobPriv->migParams, job->apiFlags);
+    qemuDomainSetMaxMemLock(vm, 0, &priv->preMigrationMemlock);
 
     return 0;
 }
-- 
2.35.1