linux-kernel - Re: [PULL] virtio

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Date:	Sun, 7 Mar 2010 12:11:26 +0100
From:	Alexander Graf <agraf@...e.de>
To:	"Michael S. Tsirkin" <mst@...hat.com>
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 07.03.2010, at 12:04, Michael S. Tsirkin wrote:

> 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.

For 0.12 there's -stable and I don't think the bad patch is in 0.11 yet?

> 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?

Ah, so you'd do the compat hack purely in qemu? Sounds good to me.

Nevermind the noise - please take that patch :-).

Alex--
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