Re: [Qemu-devel] [PATCH for-2.5] virtio-9p-device: add minimal unrealize handler

[Greg Kurz <gkurz@linux.vnet.ibm.com>]

On Thu, 10 Dec 2015 11:17:09 +0000
Peter Maydell <peter.maydell@linaro.org> wrote:

> On 8 December 2015 at 16:19, Michael S. Tsirkin <mst@redhat.com> 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 <gkurz@linux.vnet.ibm.com>
> >
> > Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
> 
> 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