qemu-kvm/SOURCES/kvm-migration-Maybe-VM-is-paused-when-migration-is-cance.patch

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From 3c4f6f0c2bf5562f2aa26f964848ae53e6ac4790 Mon Sep 17 00:00:00 2001
From: Juan Quintela <quintela@redhat.com>
Date: Tue, 3 Mar 2020 14:51:43 +0000
Subject: [PATCH 11/18] migration: Maybe VM is paused when migration is
cancelled
RH-Author: Juan Quintela <quintela@redhat.com>
Message-id: <20200303145143.149290-11-quintela@redhat.com>
Patchwork-id: 94120
O-Subject: [RHEL-AV-8.2.0 qemu-kvm PATCH v2 10/10] migration: Maybe VM is paused when migration is cancelled
Bugzilla: 1738451
RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
RH-Acked-by: Peter Xu <peterx@redhat.com>
RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
From: Zhimin Feng <fengzhimin1@huawei.com>
If the migration is cancelled when it is in the completion phase,
the migration state is set to MIGRATION_STATUS_CANCELLING.
The VM maybe wait for the 'pause_sem' semaphore in migration_maybe_pause
function, so that VM always is paused.
Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: Zhimin Feng <fengzhimin1@huawei.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
(cherry picked from commit 8958338b10abcb346b54a8038a491fda2db1c853)
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
migration/migration.c | 24 ++++++++++++++++--------
1 file changed, 16 insertions(+), 8 deletions(-)
diff --git a/migration/migration.c b/migration/migration.c
index eb50d77..ed18c59 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -2786,14 +2786,22 @@ static int migration_maybe_pause(MigrationState *s,
/* This block intentionally left blank */
}
- qemu_mutex_unlock_iothread();
- migrate_set_state(&s->state, *current_active_state,
- MIGRATION_STATUS_PRE_SWITCHOVER);
- qemu_sem_wait(&s->pause_sem);
- migrate_set_state(&s->state, MIGRATION_STATUS_PRE_SWITCHOVER,
- new_state);
- *current_active_state = new_state;
- qemu_mutex_lock_iothread();
+ /*
+ * If the migration is cancelled when it is in the completion phase,
+ * the migration state is set to MIGRATION_STATUS_CANCELLING.
+ * So we don't need to wait a semaphore, otherwise we would always
+ * wait for the 'pause_sem' semaphore.
+ */
+ if (s->state != MIGRATION_STATUS_CANCELLING) {
+ qemu_mutex_unlock_iothread();
+ migrate_set_state(&s->state, *current_active_state,
+ MIGRATION_STATUS_PRE_SWITCHOVER);
+ qemu_sem_wait(&s->pause_sem);
+ migrate_set_state(&s->state, MIGRATION_STATUS_PRE_SWITCHOVER,
+ new_state);
+ *current_active_state = new_state;
+ qemu_mutex_lock_iothread();
+ }
return s->state == new_state ? 0 : -EINVAL;
}
--
1.8.3.1