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Re: [Qemu-devel] [PATCH for-2.5] virtio-9p-device: add minimal unrealize
From: |
Greg Kurz |
Subject: |
Re: [Qemu-devel] [PATCH for-2.5] virtio-9p-device: add minimal unrealize handler |
Date: |
Thu, 10 Dec 2015 12:34:33 +0100 |
On Thu, 10 Dec 2015 11:17:09 +0000
Peter Maydell <address@hidden> wrote:
> On 8 December 2015 at 16:19, Michael S. Tsirkin <address@hidden> wrote:
> > On Tue, Dec 08, 2015 at 04:54:57PM +0100, Greg Kurz wrote:
> >> Since commit 4652f1640e029e1f2433fa77ba6af285 "virtio-9p: add savevm
> >> handlers",
> >> if the user hot-unplugs a quiescent 9p device and live migrates, the source
> >> QEMU crashes before migration completetion... This happens because
> >> virtio-9p
> >> devices have a realize handler which calls virtio_init() and
> >> register_savevm().
> >> Both calls store pointers to the device internals, that get dereferenced
> >> during
> >> migration even if the device got unplugged.
> >>
> >> This patch simply adds an unrealize handler to perform minimal cleanup and
> >> avoid the crash. Hot unplug of non-quiescent 9p devices is still not
> >> supported
> >> in QEMU, and not supported by linux guests either.
> >>
> >> Signed-off-by: Greg Kurz <address@hidden>
> >
> > Reviewed-by: Michael S. Tsirkin <address@hidden>
>
> Applied to master, thanks. (I wrapped the lines in the commit message
> which were a bit too long; wrap at 75 chars or so is recommended so
> that when you read the commit via 'git log' on an 80 column terminal
> they still fit.)
>
> thanks
> -- PMM
>
Oops my bad. I'll :set textwidth accordingly for my future posts.
Thanks.
--
Greg