linux-kernel - Re: [PATCH] KVM: x86/mmu: Don't put invalid SPs back on the list of active pages

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Message-ID: <d1916978-6efb-2839-d45a-c39ff2f6dc1f@redhat.com>
Date:   Tue, 23 Jun 2020 02:23:53 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     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
Subject: Re: [PATCH] KVM: x86/mmu: Don't put invalid SPs back on the list of
 active pages

On 22/06/20 21:18, Sean Christopherson wrote:
> diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
> index fdd05c233308..fa5bd3f987dd 100644
> --- a/arch/x86/kvm/mmu/mmu.c
> +++ b/arch/x86/kvm/mmu/mmu.c
> @@ -2757,10 +2757,13 @@ static bool __kvm_mmu_prepare_zap_page(struct kvm *kvm,
>  	if (!sp->root_count) {
>  		/* Count self */
>  		(*nr_zapped)++;
> -		list_move(&sp->link, invalid_list);
> +		if (sp->role.invalid)
> +			list_add(&sp->link, invalid_list);
> +		else
> +			list_move(&sp->link, invalid_list);

It's late here, but I think this part needs a comment anyway...

Paolo