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

[Juergen Gross <jgross@xxxxxxxx>]

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?


Juergen


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