Re: [Xen-devel] [PATCH v1] x86/hvm: Expose MSR_SHADOW_GS_BASE

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 01/09/17 11:44, Alexandru Isaila wrote:
> diff --git a/xen/include/public/arch-x86/hvm/save.h 
> b/xen/include/public/arch-x86/hvm/save.h
> index fd7bf3f..e6e8e87 100644
> --- a/xen/include/public/arch-x86/hvm/save.h
> +++ b/xen/include/public/arch-x86/hvm/save.h
> @@ -134,6 +134,8 @@ struct hvm_hw_cpu {
>      /* msr for em64t */
>      uint64_t shadow_gs;
>  
> +    uint64_t shadow_gs_base;
> +

You presumably haven't tried migrating across this boundary?  (Things
will explode rather impressively when you try to restore LSTAR into SMASK.)

What's wrong with the shadow_gs in context here?

~Andrew

>      /* msr content saved/restored. */
>      uint64_t msr_flags; /* Obsolete, ignored. */
>      uint64_t msr_lstar;


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