On Mon, Jun 22, 2015 at 12:37:37PM -0400, elena.ufimts...@oracle.com wrote:
> From: Elena Ufimtseva <elena.ufimts...@oracle.com>
>
> On AMD, MSR_AMD64_TSC_RATIO must be set for rdtsc instruction in guest
> to properly read the cpu tsc. To that end, set tsc_khz in struct domain.
It looks like the TSC_MODE_DEFAULT, TSC_MODE_ALWAYS_EMULATE, and
TSC_MODE_PVRDTSCP already set tsc_khz.
Only TSC_MODE_NEVER_EMULATE hadn't set it (but that
piece of code has some continuation from TSC_MODE_DEFAULT).
And we need this otherwise the CPU tsc offset has bogus data?
Anyway if this is the way to go, you can probably delete:
1968 d->arch.tsc_khz = cpu_khz;
>
> Signed-off-by: Mukesh Rathor <mukesh.rat...@oracle.com>
> ---
> xen/arch/x86/time.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/xen/arch/x86/time.c b/xen/arch/x86/time.c
> index bbb7e6c..d9709ce 100644
> --- a/xen/arch/x86/time.c
> +++ b/xen/arch/x86/time.c
> @@ -1923,6 +1923,7 @@ void tsc_set_info(struct domain *d,
> * but "always_emulate" does not for some reason. Figure out
> * why.
> */
> + d->arch.tsc_khz = cpu_khz;
> switch ( tsc_mode )
> {
> case TSC_MODE_NEVER_EMULATE:
> --
> 1.9.3
>
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