Re: [Xen-devel] [PATCH] pv/pvh: disable MTRR feature on cpuid for Dom0

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 12.12.13 at 17:52, Roger Pau Monne <roger.pau@xxxxxxxxxx> wrote:
> MTRR is not available for PV/PVH Dom0, so prevent cpuid from
> reporting it as an available feature.

Some misunderstanding perhaps? PV certainly has MTRR support for
Dom0 - see XENPF_*_memtype.

> --- a/xen/arch/x86/traps.c
> +++ b/xen/arch/x86/traps.c
> @@ -796,6 +796,7 @@ void pv_cpuid(struct cpu_user_regs *regs)
>          __clear_bit(X86_FEATURE_DS, &d);
>          __clear_bit(X86_FEATURE_ACC, &d);
>          __clear_bit(X86_FEATURE_PBE, &d);
> +        __clear_bit(X86_FEATURE_MTRR, &d);

Thus clearing this flag should be limited to PVH.

Jan


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