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From cfa096accd51fe9b1dfa9693ce6f4628a4e83fe6 Mon Sep 17 00:00:00 2001
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From: Stefan Hajnoczi <stefanha@redhat.com>
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Date: Tue, 13 Aug 2013 09:06:35 +0200
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Subject: migration: notify migration state before starting thread
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RH-Author: Stefan Hajnoczi <stefanha@redhat.com>
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Message-id: <1376384797-4701-5-git-send-email-stefanha@redhat.com>
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Patchwork-id: 53209
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O-Subject: [PATCH v2 4/6] migration: notify migration state before starting thread
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Bugzilla: 995030
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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RH-Acked-by: Michael S. Tsirkin <mst@redhat.com>
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The migration thread runs outside the QEMU global mutex when possible.
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Therefore we must notify migration state change *before* starting the
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migration thread.
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This allows registered listeners to act before live migration iterations
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begin. Therefore they can get into a state that allows for live
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migration. When the migration thread starts everything will be ready.
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Without this patch there is a race condition during migration setup,
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depending on whether the migration thread has already transitioned from
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SETUP to ACTIVE state.
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Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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Reviewed-by: Kevin Wolf <kwolf@redhat.com>
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit 9287ac271d83166f99e050a0e0a4ebd462f7eb2b)
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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diff --git a/migration.c b/migration.c
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index 6e29f72..177fc22 100644
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--- a/migration.c
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+++ b/migration.c
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@@ -601,7 +601,9 @@ void migrate_fd_connect(MigrationState *s)
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qemu_file_set_rate_limit(s->file,
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s->bandwidth_limit / XFER_LIMIT_RATIO);
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+ /* Notify before starting migration thread */
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+ notifier_list_notify(&migration_state_notifiers, s);
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+
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qemu_thread_create(&s->thread, migration_thread, s,
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QEMU_THREAD_JOINABLE);
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- notifier_list_notify(&migration_state_notifiers, s);
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}
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