From: Dario Faggioli <dario.faggioli@citrix.com>
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
Subject: Re: [PATCH v2 2/3] xen: add hypercall option to temporarily pin a vcpu
Date: Tue, 1 Mar 2016 13:15:19 +0100 [thread overview]
Message-ID: <1456834519.2959.215.camel@citrix.com> (raw)
In-Reply-To: <56D583F8.9070107@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:
> >
> > 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.
Thanks and Regards,
Dario
--
<<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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next prev parent reply other threads:[~2016-03-01 12:15 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 [this message]
2016-03-01 14:02 ` George Dunlap
[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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