From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dario Faggioli <dario.faggioli@citrix.com>
Subject: Re: [PATCH v2 2/3] xen: add hypercall option to
 temporarily pin a vcpu
Date: Tue, 1 Mar 2016 13:15:19 +0100
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To: 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
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On Tue, 2016-03-01 at 12:58 +0100, Juergen Gross wrote:
> On 01/03/16 12:55, David Vrabel wrote:
> >=20
> > On 01/03/16 09:02, Juergen Gross wrote:
> > >=20
> > > 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.
> > >=20
> > > 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?
>=20
Not at all. I actually like it a lot.

Thanks and Regards,
Dario
--=20
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)


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