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Message-ID: <97789f9e-a33e-bb8d-d5b1-9be31232b64a@redhat.com>
Date: Tue, 7 Jun 2022 17:14:47 +0200
From: Paolo Bonzini <pbonzini@...hat.com>
To: shaoqin.huang@...el.com
Cc: Sean Christopherson <seanjc@...gle.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
Wanpeng Li <wanpengli@...cent.com>,
Jim Mattson <jmattson@...gle.com>,
Joerg Roedel <joro@...tes.org>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
"H. Peter Anvin" <hpa@...or.com>, Ben Gardon <bgardon@...gle.com>,
kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] KVM: x86/mmu: Check every prev_roots in
__kvm_mmu_free_obsolete_roots()
On 6/7/22 02:59, shaoqin.huang@...el.com wrote:
> From: Shaoqin Huang <shaoqin.huang@...el.com>
>
> When freeing obsolete previous roots, check prev_roots as intended, not
> the current root.
>
> Signed-off-by: Shaoqin Huang <shaoqin.huang@...el.com>
> Fixes: 527d5cd7eece ("KVM: x86/mmu: Zap only obsolete roots if a root shadow page is zapped")
> ---
> Changes in v2:
> - Make the commit message more clearer.
> - Fixed the missing idx.
>
> arch/x86/kvm/mmu/mmu.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
> index f4653688fa6d..e826ee9138fa 100644
> --- a/arch/x86/kvm/mmu/mmu.c
> +++ b/arch/x86/kvm/mmu/mmu.c
> @@ -5179,7 +5179,7 @@ static void __kvm_mmu_free_obsolete_roots(struct kvm *kvm, struct kvm_mmu *mmu)
> roots_to_free |= KVM_MMU_ROOT_CURRENT;
>
> for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++) {
> - if (is_obsolete_root(kvm, mmu->root.hpa))
> + if (is_obsolete_root(kvm, mmu->prev_roots[i].hpa))
> roots_to_free |= KVM_MMU_ROOT_PREVIOUS(i);
> }
>
Queued, thanks.
Paolo
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