On 10/19/18 11:14 AM, Andrew Cooper wrote:
> diff --git a/xen/include/asm-x86/msr.h b/xen/include/asm-x86/msr.h
> index 7a061b2..c1cb38f 100644
> --- a/xen/include/asm-x86/msr.h
> +++ b/xen/include/asm-x86/msr.h
> @@ -287,6 +287,12 @@ struct vcpu_msrs
>              bool cpuid_faulting:1;
>          };
>      } misc_features_enables;
> +
> +    /*
> +     * 0xc00110{27,19-1b} MSR_AMD64_DR{0-3}_ADDRESS_MASK
> +     * TODO: Not yet handled by guest_{rd,wr}msr() infrastructure.
> +     */
> +    uint32_t dr_mask[4];
>  };
>  

You don't think wrapping these into an intel/amd union would be useful?

-boris

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