linux-kernel - Re: [PULL] virtio

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Message-ID: <20100307110457.GB20004@redhat.com>
Date:	Sun, 7 Mar 2010 13:04:57 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Alexander Graf <agraf@...e.de>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	Adam Litke <agl@...ibm.com>, Amit Shah <amit.shah@...hat.com>,
	hch@....de, Jamie Lokier <jamie@...reable.org>,
	Shirley Ma <mashirle@...ibm.com>,
	Anthony Liguori <aliguori@...ux.vnet.ibm.com>
Subject: Re: [PULL] virtio

On Sun, Mar 07, 2010 at 11:57:23AM +0100, Alexander Graf wrote:
> 
> On 07.03.2010, at 11:42, Michael S. Tsirkin wrote:
> 
> > Linus,
> > Please pull another virtio fix: this one fixes hotplug and
> > was supposed to be applied by Rusty already
> > (http://lkml.org/lkml/2009/11/30/451), but apparently got lost,
> > somehow.
> > 
> > Thanks!
> > 
> > The following changes since commit 3119815912a220bdac943dfbdfee640414c0c611:
> >  Michael S. Tsirkin (1):
> >        virtio: fix out of range array access
> > 
> > are available in the git repository at:
> > 
> >  git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git for-linus
> > 
> > Michael S. Tsirkin (1):
> >      virtio: set pci bus master enable bit
> 
> This is still missing an identifier for the hypervisor. We need to know if the guest will ever set bus master enabled or not, so we can have a compat hack in qemu to not check for it.
> 
> 
> Alex

This patch fixes hotplug with qemu 0.11-0.12 which can't make use of a new
identifier without a time machine.

IMHO we can't add new identifiers in time for 2.6.34 anyway, so if you
want to do that, please send a patch and have it queued up for the next
release. But I don't think we need an identifier for compat hack.
Hypervisor can detect buggy guests when they set status to OK without
enabling bus master first.

Makes sense?


-- 
MST
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