linux-kernel - Re: [PATCH v6 6/7] KVM: VMX: Expose PKS to guest

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Date:   Wed, 30 Mar 2022 21:30:07 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Chenyi Qiang <chenyi.qiang@...el.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Xiaoyao Li <xiaoyao.li@...el.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 6/7] KVM: VMX: Expose PKS to guest

On Mon, Feb 21, 2022, Chenyi Qiang wrote:
> @@ -7454,6 +7455,13 @@ static __init void vmx_set_cpu_caps(void)
>  
>  	if (cpu_has_vmx_waitpkg())
>  		kvm_cpu_cap_check_and_set(X86_FEATURE_WAITPKG);
> +
> +	/*
> +	 * If not support VM_{ENTRY, EXIT}_LOAD_IA32_PKRS,
> +	 * don't expose the PKS as well.
> +	 */

I wouldn't bother with the comment, this pattern is common and the behavior is
self-explanatory.

> +	if (cpu_has_load_ia32_pkrs())
> +		kvm_cpu_cap_check_and_set(X86_FEATURE_PKS);
>  }