Merge tag 'for-upstream' of https://repo.or.cz/qemu/kevin into staging

Block layer patches

- virtio-blk: Multiqueue fixes and cleanups
- blklogwrites: Fixes for write_zeroes and superblock update races
- commit/stream: Allow users to request only format driver names in
  backing file format
- monitor: only run coroutine commands in qemu_aio_context
- Some iotest fixes

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* tag 'for-upstream' of https://repo.or.cz/qemu/kevin:
  iotests/277: Use iotests.sock_dir for socket creation
  iotests/iothreads-stream: Use the right TimeoutError
  tests/unit: Bump test-replication timeout to 60 seconds
  iotests/264: Use iotests.sock_dir for socket creation
  block/blklogwrites: Protect mutable driver state with a mutex.
  virtio-blk: always set ioeventfd during startup
  virtio-blk: tolerate failure to set BlockBackend AioContext
  virtio-blk: restart s->rq reqs in vq AioContexts
  virtio-blk: rename dataplane to ioeventfd
  virtio-blk: rename dataplane create/destroy functions
  virtio-blk: move dataplane code into virtio-blk.c
  monitor: only run coroutine commands in qemu_aio_context
  iotests: port 141 to Python for reliable QMP testing
  iotests: add filter_qmp_generated_node_ids()
  stream: Allow users to request only format driver names in backing file format
  commit: Allow users to request only format driver names in backing file format
  string-output-visitor: Fix (pseudo) struct handling
  block/blklogwrites: Fix a bug when logging "write zeroes" operations.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 23 insertions, 1 deletions

diff --git a/qapi/qmp-dispatch.c b/qapi/qmp-dispatch.c
index 555528b6bb..176b549473 100644
--- a/qapi/qmp-dispatch.c
+++ b/qapi/qmp-dispatch.c
@@ -206,9 +206,31 @@ QDict *coroutine_mixed_fn qmp_dispatch(const QmpCommandList *cmds, QObject *requ
     assert(!(oob && qemu_in_coroutine()));
     assert(monitor_cur() == NULL);
     if (!!(cmd->options & QCO_COROUTINE) == qemu_in_coroutine()) {
+        if (qemu_in_coroutine()) {
+            /*
+             * Move the coroutine from iohandler_ctx to qemu_aio_context for
+             * executing the command handler so that it can make progress if it
+             * involves an AIO_WAIT_WHILE().
+             */
+            aio_co_schedule(qemu_get_aio_context(), qemu_coroutine_self());
+            qemu_coroutine_yield();
+        }
+
         monitor_set_cur(qemu_coroutine_self(), cur_mon);
         cmd->fn(args, &ret, &err);
         monitor_set_cur(qemu_coroutine_self(), NULL);
+
+        if (qemu_in_coroutine()) {
+            /*
+             * Yield and reschedule so the main loop stays responsive.
+             *
+             * Move back to iohandler_ctx so that nested event loops for
+             * qemu_aio_context don't start new monitor commands.
+             */
+            aio_co_schedule(iohandler_get_aio_context(),
+                            qemu_coroutine_self());
+            qemu_coroutine_yield();
+        }
     } else {
        /*
         * Actual context doesn't match the one the command needs.
@@ -232,7 +254,7 @@ QDict *coroutine_mixed_fn qmp_dispatch(const QmpCommandList *cmds, QObject *requ
             .errp       = &err,
             .co         = qemu_coroutine_self(),
         };
-        aio_bh_schedule_oneshot(qemu_get_aio_context(), do_qmp_dispatch_bh,
+        aio_bh_schedule_oneshot(iohandler_get_aio_context(), do_qmp_dispatch_bh,
                                 &data);
         qemu_coroutine_yield();
     }