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

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Message-ID: <20110502080422.GH18376@redhat.com>
Date:	Mon, 2 May 2011 11:04:22 +0300
From:	Gleb Natapov <gleb@...hat.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Avi Kivity <avi@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [patch 0/2] x2apic optimization, round 4

On Mon, May 02, 2011 at 11:52:26AM +0400, Cyrill Gorcunov wrote:
> 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).
> 
Ahh, definitely. I recall that now. 

--
			Gleb.
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