linux-kernel - Re: [PATCH 1/3] arm_arch_timer: introduce arch_timer_stolen

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Message-ID: <51817CBE.4050003@codeaurora.org>
Date:	Wed, 01 May 2013 16:36:14 -0400
From:	Christopher Covington <cov@...eaurora.org>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
CC:	xen-devel@...ts.xensource.com, linux@....linux.org.uk,
	marc.zyngier@....com, catalin.marinas@....com,
	konrad.wilk@...cle.com, will.deacon@....com,
	linux-kernel@...r.kernel.org, john.stultz@...aro.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/3] arm_arch_timer: introduce arch_timer_stolen_ticks

Hi Stefano,

On 05/01/2013 03:27 PM, Stefano Stabellini wrote:
> Introduce a function, called arch_timer_stolen_ticks, called from the
> arch_timer interrupt handler to account for stolen ticks.

[...]

> diff --git a/arch/arm/include/asm/arch_timer.h b/arch/arm/include/asm/arch_timer.h
> index 7ade91d..30db413 100644
> --- a/arch/arm/include/asm/arch_timer.h
> +++ b/arch/arm/include/asm/arch_timer.h
> @@ -13,6 +13,11 @@
>  int arch_timer_of_register(void);
>  int arch_timer_sched_clock_init(void);
>  
> +/* per-platform function to calculate stolen ticks (clock cycles stolen
> + * to the vcpu by the hypervisor).

Stolen from the vcpu by the hypervisor?

Is the hypervisor adjusting the Virtual Offset Register?

[...]

Thanks,
Christopher

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