Re: [PATCH 2/2] KVM: SVM: Add support for MPK feature on AMD

[Dave Hansen <dave.hansen@intel.com>]

On 5/6/20 3:02 PM, Babu Moger wrote:
> --- a/arch/x86/kvm/svm/svm.c
> +++ b/arch/x86/kvm/svm/svm.c
> @@ -818,6 +818,10 @@ static __init void svm_set_cpu_caps(void)
>  	if (boot_cpu_has(X86_FEATURE_LS_CFG_SSBD) ||
>  	    boot_cpu_has(X86_FEATURE_AMD_SSBD))
>  		kvm_cpu_cap_set(X86_FEATURE_VIRT_SSBD);
> +
> +	/* PKU is not yet implemented for shadow paging. */
> +	if (npt_enabled && boot_cpu_has(X86_FEATURE_OSPKE))
> +		kvm_cpu_cap_check_and_set(X86_FEATURE_PKU);
>  }

Reviewed-by: Dave Hansen <dave.hansen@intel.com>

But, I'll also say that we probably shouldn't have put the other code
into arch/x86/kvm/vmx/vmx.c in the first place.  It would be much nicer
if this refactored the current code into a common spot rather than
copying.  But, I do understand the impulse to do it the way it was done.