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