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Re: [Qemu-devel] [PATCH 2/3] virtio-9p: add unrealize handler


From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] [PATCH 2/3] virtio-9p: add unrealize handler
Date: Tue, 6 Oct 2015 09:09:14 +0100
User-agent: Mutt/1.5.24 (2015-08-30)

On Mon, Oct 05, 2015 at 11:07:23AM +0200, Greg Kurz wrote:
> If the user tries to hot unplug a virtio-9p device, it seems to succeed but
> in fact:
> - virtio-9p coroutines thread pool and async queue are leaked
> - QEMU crashes in virtio_vmstate_change() if the user tries to live migrate
> 
> This patch brings hot unplug support to virtio-9p-device. It fixes both
> above issues.
> 
> Signed-off-by: Greg Kurz <address@hidden>
> ---
>  hw/9pfs/virtio-9p-device.c |   12 ++++++++++++
>  1 file changed, 12 insertions(+)

What happens to in-flight I/O requests?  We cannot assume that the guest
driver quiesces the device.



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