linux-kernel - Re: [PATCH 17/15] KVM: X86: Ensure pae_root to be reconstructed for shadow paging if the guest PDPTEs is changed

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Message-ID: <56281d07-de85-69be-8855-71e7219e0227@redhat.com>
Date:   Sat, 11 Dec 2021 09:22:15 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Maxim Levitsky <mlevitsk@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>
Cc:     Lai Jiangshan <jiangshanlai@...il.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Lai Jiangshan <laijs@...ux.alibaba.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>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Xiao Guangrong <guangrong.xiao@...ux.intel.com>
Subject: Re: [PATCH 17/15] KVM: X86: Ensure pae_root to be reconstructed for
 shadow paging if the guest PDPTEs is changed

On 12/11/21 07:56, Maxim Levitsky wrote:
>> This apparently wasn't validated against a simple use case, let
>> alone against things like migration with nested VMs, multliple L2s,
>> etc...
> 
> I did validate the *SREGS2* against all the cases I could (like
> migration, EPT/NPT disabled/etc. I even started testing SMM to see
> how it affects PDPTRs, and patched seabios to use PAE paging. I still
> could have missed something.

Don't worry, I think Sean was talking about patch 16 and specifically
digging at me (who deserved it completely).

Paolo