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Re: [Qemu-devel] [PATCH for-2.10 0/3] qdev/vfio: defer DEVICE_DEL to avo


From: David Gibson
Subject: Re: [Qemu-devel] [PATCH for-2.10 0/3] qdev/vfio: defer DEVICE_DEL to avoid races with libvirt
Date: Thu, 27 Jul 2017 20:53:48 +1000
User-agent: Mutt/1.8.3 (2017-05-23)

On Thu, Jul 27, 2017 at 10:11:48AM +0100, Peter Maydell wrote:
> On 27 July 2017 at 02:30, Michael Roth <address@hidden> wrote:
> > In particular, Mellanox CX4 adapters on PowerNV hosts might not be fully
> > quiesced by vfio-pci's finalize() routine until up to 6s after the
> > DEVICE_DELETED was emitted, leading to detach-device on the libvirt side 
> > pretty
> > much always crashing the host.
> 
> My initial naive thought is that if the host kernel can crash then
> this is a host kernel bug... shouldn't the host kernel refuse
> the subsequent libvirt rebind if it would cause a crash ?

I think so too, but I haven't been able to convince Alex.  Nor
find time to fix it in the kernel myself.

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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