linux-kernel - Re: [PATCH v11 5/5] xen/arm: account for stolen ticks

Open Source and information security mailing list archives

Date:	Thu, 5 Nov 2015 16:57:43 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc:	xen-devel@...ts.xensource.com, linux@....linux.org.uk,
	Ian.Campbell@...rix.com, arnd@...db.de, marc.zyngier@....com,
	catalin.marinas@....com, konrad.wilk@...cle.com,
	will.deacon@....com, linux-kernel@...r.kernel.org, olof@...om.net,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v11 5/5] xen/arm: account for stolen ticks

>  static void xen_percpu_init(void)
>  {
>  	struct vcpu_register_vcpu_info info;
> @@ -104,6 +120,8 @@ static void xen_percpu_init(void)
>  	BUG_ON(err);
>  	per_cpu(xen_vcpu, cpu) = vcpup;
>  
> +	xen_setup_runstate_info(cpu);

Does the runstate memory area get unregsitered when a kernel tears
things down, or is kexec somehow inhibited for xen guests?

i couldn't spot either happening, but I may have missed it.

Mark.

> +
>  after_register_vcpu_info:
>  	enable_percpu_irq(xen_events_irq, 0);
>  	put_cpu();
> @@ -271,6 +289,9 @@ static int __init xen_guest_init(void)
>  
>  	register_cpu_notifier(&xen_cpu_notifier);
>  
> +	pv_time_ops.steal_clock = xen_stolen_accounting;
> +	static_key_slow_inc(&paravirt_steal_enabled);
> +
>  	return 0;
>  }
>  early_initcall(xen_guest_init);
> -- 
> 1.7.10.4
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> 
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