linux-kernel - Re: [PATCH v3 5/6] virt, sched: add cpu pinning to smp_call_sync_on_phys

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Message-ID: <20160401091507.GG3448@twins.programming.kicks-ass.net>
Date:	Fri, 1 Apr 2016 11:15:07 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Juergen Gross <jgross@...e.com>
Cc:	linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
	konrad.wilk@...cle.com, boris.ostrovsky@...cle.com,
	david.vrabel@...rix.com, mingo@...hat.com,
	Douglas_Warzecha@...l.com, pali.rohar@...il.com, jdelvare@...e.com,
	linux@...ck-us.net, tglx@...utronix.de, hpa@...or.com,
	jeremy@...p.org, chrisw@...s-sol.org, akataria@...are.com,
	rusty@...tcorp.com.au, virtualization@...ts.linux-foundation.org,
	x86@...nel.org
Subject: Re: [PATCH v3 5/6] virt, sched: add cpu pinning to
 smp_call_sync_on_phys_cpu()

On Fri, Apr 01, 2016 at 11:03:21AM +0200, Juergen Gross wrote:
> > Maybe just make the vpin thing an option like:
> > 
> > 	smp_call_on_cpu(int (*func)(void *), int phys_cpu);

> > Also; is something like the vpin thing possible on KVM? because if we're
> > going to expose it to generic code like this we had maybe look at wider
> > support.
> 
> It is necessary for dom0 under Xen. I don't think there is a need to do
> this on KVM as a guest has no direct access to e.g. BIOS functions of
> the real hardware and the host system needs no vcpu pinning. I'm not
> sure about VMWare.

OK, then can we WARN if .phys=1 and the platform doesn't support it?