linux-kernel - Re: [PATCH v2 6/7] don't compute pvclock adjustments if we trust the tsc

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Date:	Wed, 05 May 2010 11:28:11 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Glauber Costa <glommer@...hat.com>
CC:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	zamsden@...hat.com
Subject: Re: [PATCH v2 6/7] don't compute pvclock adjustments if we trust
 the tsc

On 05/03/2010 06:52 PM, Glauber Costa wrote:
> If the HV told us we can fully trust the TSC, skip any
> correction
>
>    

> Signed-off-by: Glauber Costa<glommer@...hat.com>
> ---
>   arch/x86/include/asm/kvm_para.h    |    5 +++++
>   arch/x86/include/asm/pvclock-abi.h |    1 +
>   arch/x86/kernel/kvmclock.c         |    3 +++
>   arch/x86/kernel/pvclock.c          |    4 ++++
>   4 files changed, 13 insertions(+), 0 deletions(-)
>
> diff --git a/arch/x86/include/asm/kvm_para.h b/arch/x86/include/asm/kvm_para.h
> index f019f8c..6f1b878 100644
> --- a/arch/x86/include/asm/kvm_para.h
> +++ b/arch/x86/include/asm/kvm_para.h
> @@ -21,6 +21,11 @@
>    */
>   #define KVM_FEATURE_CLOCKSOURCE2        3
>
> +/* The last 8 bits are used to indicate how to interpret the flags field
> + * in pvclock structure. If no bits are set, all flags are ignored.
> + */
> +#define KVM_FEATURE_CLOCKSOURCE_STABLE_TSC	24
>    

This needs documentation (in cpuid.txt).  The flag doesn't mean the TSC 
is stable, rather it means the pvclock tsc stable bit is valid.


-- 
error compiling committee.c: too many arguments to function

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