Re: [Xen-devel] [PATCH v17 08/10] x86: add CMT related MSRs in allowed list

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 29/09/14 11:40, Chao Peng wrote:
> Tool stack will try to access the two MSRs to perform CMT
> related operations, thus added them in the allowed list.
>
> Signed-off-by: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
> Signed-off-by: Chao Peng <chao.p.peng@xxxxxxxxxxxxxxx>

Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

> ---
>  xen/arch/x86/platform_hypercall.c |    8 ++++++++
>  xen/include/asm-x86/msr-index.h   |    2 ++
>  2 files changed, 10 insertions(+)
>
> diff --git a/xen/arch/x86/platform_hypercall.c 
> b/xen/arch/x86/platform_hypercall.c
> index 4b92b56..c049499 100644
> --- a/xen/arch/x86/platform_hypercall.c
> +++ b/xen/arch/x86/platform_hypercall.c
> @@ -69,6 +69,14 @@ struct xen_resource_access {
>  
>  static bool_t allow_access_msr(unsigned int msr)
>  {
> +    switch ( msr )
> +    {
> +    /* MSR for CMT, refer to chapter 17.14 of Intel SDM. */
> +    case MSR_IA32_QOSEVTSEL:
> +    case MSR_IA32_QMC:
> +        return 1;
> +    }
> +
>      return 0;
>  }
>  
> diff --git a/xen/include/asm-x86/msr-index.h b/xen/include/asm-x86/msr-index.h
> index dcb2b87..ae089fb 100644
> --- a/xen/include/asm-x86/msr-index.h
> +++ b/xen/include/asm-x86/msr-index.h
> @@ -324,6 +324,8 @@
>  #define MSR_IA32_ENERGY_PERF_BIAS    0x000001b0
>  
>  /* Platform Shared Resource MSRs */
> +#define MSR_IA32_QOSEVTSEL           0x00000c8d
> +#define MSR_IA32_QMC                 0x00000c8e
>  #define MSR_IA32_PQR_ASSOC           0x00000c8f
>  
>  /* Intel Model 6 */


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