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[Qemu-stable] [PULL 2/9] call bdrv_drain_all() even if the vm is stopped

From: Paolo Bonzini
Subject: [Qemu-stable] [PULL 2/9] call bdrv_drain_all() even if the vm is stopped
Date: Thu, 26 Nov 2015 16:52:10 +0100

From: Wen Congyang <address@hidden>

There are still I/O operations when the vm is stopped. For example,
stop the vm, and do block migration. In this case, we don't drain all
I/O operation, and may meet the following problem:

qemu-system-x86_64: migration/block.c:731: block_save_complete: Assertion 
`block_mig_state.submitted == 0' failed.

Signed-off-by: Wen Congyang <address@hidden>
Message-Id: <address@hidden>
Cc: address@hidden
Signed-off-by: Paolo Bonzini <address@hidden>
 cpus.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/cpus.c b/cpus.c
index 877bd70..43676fa 100644
--- a/cpus.c
+++ b/cpus.c
@@ -1415,6 +1415,8 @@ int vm_stop_force_state(RunState state)
         return vm_stop(state);
     } else {
+        bdrv_drain_all();
         /* Make sure to return an error if the flush in a previous vm_stop()
          * failed. */
         return bdrv_flush_all();

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