Soon bdrv_drain will not call aio_poll itself on iothreads.  If block
devices are left hanging off the iothread's AioContext, there will be no
one to do I/O for those poor devices.

Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
 iothread.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/iothread.c b/iothread.c
index 62c8796..8153e21 100644
--- a/iothread.c
+++ b/iothread.c
@@ -16,6 +16,7 @@
 #include "qom/object_interfaces.h"
 #include "qemu/module.h"
 #include "block/aio.h"
+#include "block/block.h"
 #include "sysemu/iothread.h"
 #include "qmp-commands.h"
 #include "qemu/error-report.h"
@@ -199,6 +200,15 @@ IOThreadInfoList *qmp_query_iothreads(Error **errp)
 void iothread_stop_all(void)
 {
     Object *container = object_get_objects_root();
+    BlockDriverState *bs;
+    BdrvNextIterator it;
+
+    for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) {
+        AioContext *ctx = bdrv_get_aio_context(bs);
+        aio_context_acquire(ctx);
+        bdrv_set_aio_context(bs, qemu_get_aio_context());
+        aio_context_release(ctx);
+    }
 
     object_child_foreach(container, iothread_stop, NULL);
 }
-- 
2.7.4



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