Re: [PATCH 1/5] Add a global synchronization point for pvclock

[Avi Kivity]

On 04/23/2010 04:44 AM, Zachary Amsden wrote:
>    Or apply this patch.
> time-warp.patch
>
>
> diff -rup a/time-warp-test.c b/time-warp-test.c
> --- a/time-warp-test.c	2010-04-15 16:30:13.955981607 -1000
> +++ b/time-warp-test.c	2010-04-15 16:35:37.777982377 -1000
> @@ -91,7 +91,7 @@ static inline unsigned long long __rdtsc
>   {
>   	DECLARE_ARGS(val, low, high);
>
> -	asm volatile("cpuid; rdtsc" : EAX_EDX_RET(val, low, high));
> +	asm volatile("cpuid; rdtsc" : EAX_EDX_RET(val, low, high) :: "ebx", "ecx");
>
>    

Plus, replace cpuid by lfence/mfence.  cpuid will trap.

--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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