From: George Dunlap <george.dunlap@citrix.com>
To: Dario Faggioli <dario.faggioli@citrix.com>,
Juergen Gross <jgross@suse.com>,
David Vrabel <david.vrabel@citrix.com>,
xen-devel@lists.xen.org
Cc: wei.liu2@citrix.com, stefano.stabellini@eu.citrix.com,
george.dunlap@eu.citrix.com, andrew.cooper3@citrix.com,
ian.jackson@eu.citrix.com, jbeulich@suse.com
Subject: Re: [PATCH v2 2/3] xen: add hypercall option to temporarily pin a vcpu
Date: Tue, 1 Mar 2016 14:02:06 +0000 [thread overview]
Message-ID: <56D5A0DE.8030202@citrix.com> (raw)
In-Reply-To: <1456834519.2959.215.camel@citrix.com>
On 01/03/16 12:15, Dario Faggioli wrote:
> On Tue, 2016-03-01 at 12:58 +0100, Juergen Gross wrote:
>> On 01/03/16 12:55, David Vrabel wrote:
>>>
>>> On 01/03/16 09:02, Juergen Gross wrote:
>>>>
>>>> Some hardware (e.g. Dell studio 1555 laptops) require SMIs to be
>>>> called on physical cpu 0 only. Linux drivers like dcdbas or i8k
>>>> try
>>>> to achieve this by pinning the running thread to cpu 0, but in
>>>> Dom0
>>>> this is not enough: the vcpu must be pinned to physical cpu 0 via
>>>> Xen, too.
>>>>
>>>> Add a stable hypercall option SCHEDOP_pin_temp to the sched_op
>>>> hypercall to achieve this. It is taking a physical cpu number as
>>>> parameter. If pinning is possible (the calling domain has the
>>>> privilege to make the call and the cpu is available in the
>>>> domain's
>>>> cpupool) the calling vcpu is pinned to the specified cpu. The old
>>>> cpu affinity is saved. To undo the temporary pinning a cpu -1 is
>>>> specified. This will restore the original cpu affinity for the
>>>> vcpu.
>>> I suggest SCHEDOP_pin_override as a name.
>>
>> I'm fine with that. Any objections?
>>
> Not at all. I actually like it a lot.
+1 to the name.
-George
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next prev parent reply other threads:[~2016-03-01 14:02 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-01 9:02 [PATCH v2 0/3] add hypercall option to temporarily pin a vcpu Juergen Gross
2016-03-01 9:02 ` [PATCH v2 1/3] xen: silence affinity messages on suspend/resume Juergen Gross
2016-03-02 11:11 ` Dario Faggioli
2016-03-01 9:02 ` [PATCH v2 2/3] xen: add hypercall option to temporarily pin a vcpu Juergen Gross
2016-03-01 11:27 ` Jan Beulich
2016-03-01 11:55 ` David Vrabel
2016-03-01 11:58 ` Juergen Gross
2016-03-01 12:15 ` Dario Faggioli
2016-03-01 14:02 ` George Dunlap [this message]
[not found] ` <56D58ABF02000078000D7C46@suse.com>
2016-03-01 11:58 ` Juergen Gross
2016-03-01 15:52 ` George Dunlap
2016-03-01 15:55 ` George Dunlap
2016-03-01 16:11 ` Jan Beulich
2016-03-02 7:14 ` Juergen Gross
2016-03-02 9:27 ` Dario Faggioli
2016-03-02 11:19 ` Juergen Gross
2016-03-02 11:49 ` Dario Faggioli
2016-03-02 12:12 ` Juergen Gross
2016-03-02 15:34 ` Juergen Gross
2016-03-02 16:03 ` Dario Faggioli
2016-03-02 17:15 ` Juergen Gross
2016-03-02 17:21 ` Anshul Makkar
2016-03-03 5:31 ` Juergen Gross
2016-03-01 9:02 ` [PATCH v2 3/3] libxc: do some retries in xc_cpupool_removecpu() for EBUSY case Juergen Gross
2016-03-01 11:58 ` Wei Liu
2016-03-01 11:59 ` Juergen Gross
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