Re: [Xen-devel] [PATCH v3 2/6] xen: add hypercall option to override and restore vcpu affinity

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 03.03.16 at 17:48, <JGross@xxxxxxxx> 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_override 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 override pinning a negative cpu
> value is specified. This will restore the original cpu affinity of
> the vcpu.
> 
> Cc: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
> Cc: Dario Faggioli <dario.faggioli@xxxxxxxxxx>
> Cc: Jan Beulich <jbeulich@xxxxxxxx>
> Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
> Cc: David Vrabel <david.vrabel@xxxxxxxxxx>
> Cc: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
> 
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>

Acked-by: Jan Beulich <jbeulich@xxxxxxxx>




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