linux-kernel - Re: [Xen-devel] [PATCH v2 5/6] virt, sched: add cpu pinning to smp_call_sync_on_phys

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Date:	Mon, 21 Mar 2016 07:42:58 -0600
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Juergen Gross" <JGross@...e.com>
Cc:	<david.vrabel@...rix.com>, <Douglas_Warzecha@...l.com>,
	<pali.rohar@...il.com>, <jeremy@...p.org>, <peterz@...radead.org>,
	<x86@...nel.org>, <tglx@...utronix.de>,
	<virtualization@...ts.linux-foundation.org>,
	<xen-devel@...ts.xenproject.org>, <boris.ostrovsky@...cle.com>,
	<mingo@...hat.com>, <linux@...ck-us.net>, <rusty@...tcorp.com.au>,
	<chrisw@...s-sol.org>, "Jean Delvare" <jdelvare@...e.com>,
	<linux-kernel@...r.kernel.org>, <akataria@...are.com>,
	<hpa@...or.com>
Subject: Re: [Xen-devel] [PATCH v2 5/6] virt, sched: add cpu pinning to
 smp_call_sync_on_phys_cpu()

>>> On 21.03.16 at 13:24, <JGross@...e.com> wrote:
> @@ -758,9 +759,14 @@ struct smp_sync_call_struct {
>  static void smp_call_sync_callback(struct work_struct *work)
>  {
>  	struct smp_sync_call_struct *sscs;
> +	unsigned int cpu = smp_processor_id();

So this obtains the vCPU number, yet ...

>  	sscs = container_of(work, struct smp_sync_call_struct, work);
> +	preempt_disable();
> +	hypervisor_pin_vcpu(cpu);

... here you're supposed to pass a pCPU number.

Also don't you need to call smp_processor_id() after preempt_disable()?

Jan