linux-kernel - Re: [PATCH 06/13] KVM: SVM: Add VNMI bit definition

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Message-ID: <Y3Zkkc1edwYtpk+N@google.com>
Date:   Thu, 17 Nov 2022 16:42:57 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Maxim Levitsky <mlevitsk@...hat.com>, kvm@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sandipan Das <sandipan.das@....com>,
        Daniel Sneddon <daniel.sneddon@...ux.intel.com>,
        Jing Liu <jing2.liu@...el.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Wyes Karny <wyes.karny@....com>,
        Babu Moger <babu.moger@....com>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Jim Mattson <jmattson@...gle.com>, x86@...nel.org,
        Santosh Shukla <santosh.shukla@....com>
Subject: Re: [PATCH 06/13] KVM: SVM: Add VNMI bit definition

On Thu, Nov 17, 2022, Borislav Petkov wrote:
> On Thu, Nov 17, 2022 at 04:32:35PM +0200, Maxim Levitsky wrote:
> > @@ -5029,6 +5031,10 @@ static __init int svm_hardware_setup(void)
> >  		svm_x86_ops.vcpu_get_apicv_inhibit_reasons = NULL;
> >  	}
> >  
> > +	vnmi = vnmi && boot_cpu_has(X86_FEATURE_AMD_VNMI);
> 
> s/boot_cpu_has/cpu_feature_enabled/

Why?  This is rarely run code, won't cpu_feature_enabled() unnecessarily require
patching?

And while we're on the topic... https://lore.kernel.org/all/Y22IzA9DN%2FxYWgWN@google.com