linux-kernel - Re: [PATCH v3 03/37] KVM: nVMX: Invalidate all EPTP contexts when emulating INVEPT for L1

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Date:   Tue, 24 Mar 2020 00:50:53 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Jim Mattson <jmattson@...gle.com>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Joerg Roedel <joro@...tes.org>, kvm list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ben Gardon <bgardon@...gle.com>,
        Junaid Shahid <junaids@...gle.com>,
        Liran Alon <liran.alon@...cle.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        John Haxby <john.haxby@...cle.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: [PATCH v3 03/37] KVM: nVMX: Invalidate all EPTP contexts when
 emulating INVEPT for L1

On 23/03/20 17:44, Sean Christopherson wrote:
> So I think
> 
>   Fixes: 14c07ad89f4d ("x86/kvm/mmu: introduce guest_mmu")
> 
> would be appropriate?
> 

Yes.  I changed it and also added the comment

+		/*
+		 * Nested EPT roots are always held through guest_mmu,
+		 * not root_mmu.
+		 */

which isn't unlike what you suggested elsewhere in the thread.

Paolo