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Date: Tue, 21 Dec 2010 10:56:50 -0600
From: Anthony Liguori <anthony@codemonkey.ws>
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Subject: Re: [Qemu-devel] Re: [PATCH] qemu-kvm: Switch to upstream -enable-kvm
	semantics
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To: Markus Armbruster <armbru@redhat.com>
Cc: Avi Kivity <avi@redhat.com>, "Richard W.M. Jones" <rjones@redhat.com>, kvm@vger.kernel.org, qemu-devel <qemu-devel@nongnu.org>

On 12/21/2010 10:07 AM, Markus Armbruster wrote:
> "Richard W.M. Jones"<rjones@redhat.com>  writes:
>
>    
>> On Tue, Dec 21, 2010 at 04:41:03PM +0100, Markus Armbruster wrote:
>>      
>>> Like this?
>>>
>>> upstream qemu   |  default  |-enable-kvm
>>> ----------------+-----------+-----------
>>> KVM available   | disabled  |  enabled
>>> KVM unavailable | disabled  |    fail
>>>
>>> qemu-kvm        |  default  |-enable-kvm|  -no-kvm
>>> ----------------+-----------+-----------+-----------
>>> KVM available   |  enabled* |  enabled  |  disabled
>>> KVM unavailable | disabled  |    fail   |  disabled
>>>
>>> * differs from upstream
>>>        
>> libguestfs wants "best effort" behaviour, and libvirt wants "KVM or die"
>> behaviour.
>>      
> For what it's worth, default gives you exactly that with qemu-kvm.
> Maybe that's good enough, on the theory that if you have KVM, you most
> likely have libguestfs using qemu-kvm.
>
>    
>> Avi, can you comment on whether just opening /dev/kvm O_RDWR is a
>> reasonable way to detect if KVM is available?
>>
>> Markus, any idea when we might get the -accel option appearing in
>> released versions of qemu/KVM?
>>      
> No idea.  Anthony?
>    

I see no problem with 0.15 if someone cooks up a patch.

Regards,

Anthony Liguori