linux-kernel - Re: [PATCH 1/1] KVM: x86: remove incorrect comment on active_mmu

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Date:   Thu, 25 Feb 2021 16:44:31 -0800
From:   Sean Christopherson <seanjc@...gle.com>
To:     Dongli Zhang <dongli.zhang@...cle.com>
Cc:     x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        pbonzini@...hat.com, vkuznets@...hat.com, wanpengli@...cent.com,
        jmattson@...gle.com, joro@...tes.org, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, hpa@...or.com
Subject: Re: [PATCH 1/1] KVM: x86: remove incorrect comment on
 active_mmu_pages

On Tue, Feb 23, 2021, Dongli Zhang wrote:
> The 'mmu_page_hash' is used as hash table while 'active_mmu_pages' is a
> list. This patch removes the incorrect comment on active_mmu_pages.

Maybe change the last sentence to "Remove the misplaced comment, it's mostly
stating the obvious anyways."  It's more misplaced than flat out incorrect, e.g.
the alternative would be to hoist the comment above mmu_page_hash.  I like
removing it though, IMO mmu_page_hash is the most obvious name out of the
various structures that track shadow pages.

With that tweak:

Reviewed-by: Sean Christopherson <seanjc@...gle.com>


> Signed-off-by: Dongli Zhang <dongli.zhang@...cle.com>
> ---
>  arch/x86/include/asm/kvm_host.h | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index 84499aad01a4..318242512407 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -937,9 +937,6 @@ struct kvm_arch {
>  	unsigned int indirect_shadow_pages;
>  	u8 mmu_valid_gen;
>  	struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
> -	/*
> -	 * Hash table of struct kvm_mmu_page.
> -	 */
>  	struct list_head active_mmu_pages;
>  	struct list_head zapped_obsolete_pages;
>  	struct list_head lpage_disallowed_mmu_pages;
> -- 
> 2.17.1
>