Re: [Xen-devel] [PATCH v2 2/3] xen: add hypercall option to temporarily pin a vcpu

[George Dunlap <george.dunlap@xxxxxxxxxx>]

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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