Re: [Xen-devel] [PATCH] Allow dom0 to write MSR IA32_ENERGY_PERF

To:	Jan Beulich <JBeulich@xxxxxxxxxx>, Gang Wei <gang.wei@xxxxxxxxx>
Subject:	Re: [Xen-devel] [PATCH] Allow dom0 to write MSR IA32_ENERGY_PERF_BIAS
From:	Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date:	Wed, 5 Jan 2011 08:13:16 +0000
Cc:	"xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Delivery-date:	Tue, 11 Jan 2011 02:52:25 -0800
Envelope-to:	www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to:	<4D24330A020000780002A610@xxxxxxxxxxxxxxxxxx>
List-help:	<mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id:	Xen developer discussion <xen-devel.lists.xensource.com>
List-post:	<mailto:xen-devel@lists.xensource.com>
List-subscribe:	<http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe:	<http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender:	xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index:	AcusrouHut22FSSYTqqxvjRlK+7mOQAAdvqD
Thread-topic:	[Xen-devel] [PATCH] Allow dom0 to write MSR IA32_ENERGY_PERF_BIAS
User-agent:	Microsoft-Entourage/12.28.0.101117

On 05/01/2011 07:59, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:

>>> Why would you allow this only if Dom0 has its vcpus pinned?
>> 
>> It is meaningless if dom0 can't control all pcpus exactly. Only in case of
>> dom0 vcpus pinned, it makes sense.
> 
> Disagree. The user mode tool could set its own affinity (virtual and
> physical) and then issue the MSR write. Please don't enforce
> restrictions where not really needed (I actually suppose that the
> restriction should be removed for MSR_IA32_THERM_CONTROL too).

If so, it deserves a separate patch to strip out *all* the is_pinned checks
at the same time.

 -- Keir



_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

<Prev in Thread]

Current Thread

[Next in Thread>

Previous by Date:

Re: [Xen-devel] Xen build - Debian vs Redhat layout patch options, user virtual

Next by Date:

Re: [Xen-devel] Re: pvusb drivers for pvops 2.6.32.x kernel, Nathanael Rensen

Previous by Thread:

RE: [Xen-devel] [PATCH] Allow dom0 to write MSR IA32_ENERGY_PERF_BIAS, Jan Beulich

Next by Thread:

Re: [Xen-devel] [PATCH] Allow dom0 to write MSR IA32_ENERGY_PERF_BIAS, Jan Beulich

Indexes:

[Date] [Thread] [Top] [All Lists]

WARNING - OLD ARCHIVES

xen-devel

Re: [Xen-devel] [PATCH] Allow dom0 to write MSR IA32_ENERGY_PERF_BIAS