linux-kernel - Re: [PATCH 08/23] KVM: MMU: rephrase unclear comment

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Date:   Fri, 4 Feb 2022 19:38:41 +0000
From:   David Matlack <dmatlack@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        seanjc@...gle.com, vkuznets@...hat.com
Subject: Re: [PATCH 08/23] KVM: MMU: rephrase unclear comment

On Fri, Feb 04, 2022 at 06:57:03AM -0500, Paolo Bonzini wrote:
> If accessed bits are not supported there simple isn't any distinction
> between accessed and non-accessed gPTEs, so the comment does not make
> much sense.  Rephrase it in terms of what happens if accessed bits
> *are* supported.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>

Reviewed-by: David Matlack <dmatlack@...gle.com>

> ---
>  arch/x86/kvm/mmu/paging_tmpl.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kvm/mmu/paging_tmpl.h b/arch/x86/kvm/mmu/paging_tmpl.h
> index 5b5bdac97c7b..6bb9a377bf89 100644
> --- a/arch/x86/kvm/mmu/paging_tmpl.h
> +++ b/arch/x86/kvm/mmu/paging_tmpl.h
> @@ -193,7 +193,7 @@ static bool FNAME(prefetch_invalid_gpte)(struct kvm_vcpu *vcpu,
>  	if (!FNAME(is_present_gpte)(gpte))
>  		goto no_present;
>  
> -	/* if accessed bit is not supported prefetch non accessed gpte */
> +	/* if accessed bit is supported, prefetch only accessed gpte */
>  	if (PT_HAVE_ACCESSED_DIRTY(vcpu->arch.mmu) &&
>  	    !(gpte & PT_GUEST_ACCESSED_MASK))
>  		goto no_present;
> -- 
> 2.31.1
> 
>