[Xen-devel] [PATCH]Fix the issue: xm command line will hang if using "xm save dom_id file" to save a guest.

["Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx>]

Fix the issue: xm command line will hang if using "xm save dom_id file"
to save a guest.
  - When saving a guest in early ChangeSet (Before 16750), Xend will
send "SIGKILL" signal to kill qemu process. But in ChangeSet 16750, the
signal is modified to "SIGTERM". However, "SIGTERM" handler has been
registered by SDL in qemu. So when qemu process receives a "SIGTERM",
SDL will catch it and it will push out a "SDL_QUIT" even to qemu. If
qemu can receive that event, it will be successfully terminated. While
we do "xm save", qemu can't go out from the dead loop "while
(suspend_requested) {...}" in main_loop() to handle the SQL_QUIT event.
so it is unable to poll that "SDL_QUIT" event. This makes xm save
command hang. This fix enables qemu to poll the "SDL_QUIT" event while
doing save.

Signed-off-by: Xu Dongxiao <dongxiao.xu@xxxxxxxxx>

Best Regards,
Xu Dongxiao

Attachment: save_hang.patch
Description: save_hang.patch

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