linux-kernel - Re: [KVM PATCH v9 0/5] irqfd fixes and enhancements

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Date:	Sun, 5 Jul 2009 13:38:57 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Gregory Haskins <ghaskins@...ell.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, davidel@...ilserver.org
Subject: Re: [KVM PATCH v9 0/5] irqfd fixes and enhancements

On Sun, Jul 05, 2009 at 12:28:30PM +0300, Avi Kivity wrote:
> On 07/02/2009 06:50 PM, Avi Kivity wrote:
>> On 07/02/2009 06:37 PM, Gregory Haskins wrote:
>>> (Applies to kvm.git/master:1f9050fd)
>>>
>>> The following is the latest attempt to fix the races in  
>>> irqfd/eventfd, as
>>> well as restore DEASSIGN support.  For more details, please read the  
>>> patch
>>> headers.
>>>
>>> As always, this series has been tested against the kvm-eventfd unit test
>>> and everything appears to be functioning properly. You can download this
>>> test here:
>>
>> Applied, thanks.
>>
>
> ... and unapplied.  There's a refcounting mismatch in irqfd_cleanup: a  
> reference is taken for each irqfd, but dropped for each guest.  This  
> causes an oops if a guest with no irqfds is created and destroyed:

Avi, I verified and it seems that reverting just the last patch
in series should be enough. Comments?

-- 
MST
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