linux-kernel - Re: [PATCH v2] KVM: x86/mmu: Check every prev_roots in __kvm_mmu_free_obsolete

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Date:   Mon, 6 Jun 2022 16:56:50 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     shaoqin.huang@...el.com
Cc:     pbonzini@...hat.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 Mon, Jun 06, 2022, 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")

Because KVM patches aren't guaranteed to be backported without it (though it's
"only" v5.18 that's affected), this needs:

  Cc: stable@...r.kernel.org 

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