linux-kernel - Re: [PATCH v2 10/14] KVM: SVM: Explicitly check max SEV ASID during sev_hardware

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Date:   Thu, 14 Jan 2021 15:35:01 -0600
From:   Brijesh Singh <brijesh.singh@....com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     brijesh.singh@....com, Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Borislav Petkov <bp@...e.de>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: [PATCH v2 10/14] KVM: SVM: Explicitly check max SEV ASID during
 sev_hardware_setup()


On 1/13/21 6:37 PM, Sean Christopherson wrote:
> Query max_sev_asid directly after setting it instead of bouncing through
> its wrapper, svm_sev_enabled().  Using the wrapper is unnecessary
> obfuscation.
>
> No functional change intended.
>
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> ---
>  arch/x86/kvm/svm/sev.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)

thanks

Reviewed-by: Brijesh Singh <brijesh.singh@....com>

>
> diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
> index 02a66008e9b9..1a143340103e 100644
> --- a/arch/x86/kvm/svm/sev.c
> +++ b/arch/x86/kvm/svm/sev.c
> @@ -1278,8 +1278,7 @@ void __init sev_hardware_setup(void)
>  
>  	/* Maximum number of encrypted guests supported simultaneously */
>  	max_sev_asid = ecx;
> -
> -	if (!svm_sev_enabled())
> +	if (!max_sev_asid)
>  		goto out;
>  
>  	/* Minimum ASID value that should be used for SEV guest */