On 14/09/16 22:01, Kyle Huey wrote:
> Xen advertises the underlying support for CPUID faulting but not does pass
> through writes to the relevant MSR, nor does it virtualize it, so it does
> not actually work. For now mask off the relevant bit on MSR_PLATFORM_INFO.

Could you clarify in the commit message that it is PV guests that are
affected.

> --- a/arch/x86/xen/enlighten.c
> +++ b/arch/x86/xen/enlighten.c
> @@ -1050,6 +1050,9 @@ static u64 xen_read_msr_safe(unsigned int msr, int *err)
>  #endif
>                       val &= ~X2APIC_ENABLE;
>               break;
> +     case MSR_PLATFORM_INFO:
> +             val &= ~CPUID_FAULTING_SUPPORT;
> +             break;
>       }
>       return val;
>  }

Acked-by: David Vrabel <david.vra...@citrix.com>

David


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