linux-kernel - Re: [Xen-devel] [PATCH 1/3] PAD helper for native and paravirt platform

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Date:	Wed, 28 Mar 2012 15:52:10 +0100
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>
Cc:	"Konrad Rzeszutek Wilk" <konrad@...nok.org>,
	"keir.xen@...il.com" <keir.xen@...il.com>,
	"Jinsong Liu" <jinsong.liu@...el.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"Kernel development list" <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH 1/3] PAD helper for native and paravirt
 platform

>>> On 28.03.12 at 16:27, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> wrote:
> On Wed, Mar 28, 2012 at 01:42:45PM +0100, Jan Beulich wrote:
>> >>> On 28.03.12 at 12:48, "Liu, Jinsong" <jinsong.liu@...el.com> wrote:
>> > But just curious, what's the purpose and benefit of exposing mwait to dom0? 
> 
> 
> So that cstate.c can evaluate properly the deeper C-states and 
> xen-acpi-processor
> can upload them to the hypervisor.
> 
>> > I remember xen against doing so before.
>> 
>> And I don't recall anything having changed in that regard.
> 
> Jan, you Acked the patch in question: https://lkml.org/lkml/2012/2/24/129 

But that isn't a Xen patch. Xen isn't (and shouldn't be) exposing mwait.

Jan

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