Re: [patch 0/2] x2apic optimization, round 4

[Cyrill Gorcunov]

On 05/02/2011 11:45 AM, Gleb Natapov wrote:
> On Mon, May 02, 2011 at 11:09:16AM +0400, Cyrill Gorcunov wrote:
>> On 05/02/2011 09:51 AM, Cyrill Gorcunov wrote:
>>> Yeah, i'll do so as only bring my laptop to life, I managed to kill
>>> grub and can't restore it back for a while, will ping you back as soon
>>> as I can.
>>>
>>> Sorry for top post.
>>>
>>
>>   I've managed to semi-restore it. Gleb, maybe there some additional
>> parameter needed for kvm (except -cpu host,+x2apic) to make it work
>> with cluster mode? I always see physical mode which was not the target
>> of the patch series.
>>
> Hmm, +x2apic is enough to advertise x2apic presents to the OS. What
> logic Linux uses to decide which mode to use?
> 
> --
> 			Gleb.

  As far as I know interrupt remapping should be supported by kernel
to switch to logic cluster mode, so I presume kvm doesn't support
it yet and in result only physical mode is used. I think ACPI_SIG_DMAR
is missed in acpi tables (actually I didn't find it in kvm sources).

-- 
Thanks,
  Cyrill
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