linux-kernel - Re: [PATCH v5 2/3] KVM: VMX: Enable Notify VM exit

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Date:   Wed, 6 Apr 2022 18:54:56 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Chenyi Qiang <chenyi.qiang@...el.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Xiaoyao Li <xiaoyao.li@...el.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Tao Xu <tao3.xu@...el.com>
Subject: Re: [PATCH v5 2/3] KVM: VMX: Enable Notify VM exit

On Wed, Apr 06, 2022, Sean Christopherson wrote:
> On Fri, Mar 18, 2022, Chenyi Qiang wrote:
> Ha, and I think skipping this path on VMX_EXIT_REASONS_FAILED_VMENTRY is also
> technically wrong.  That's still a VM-Exit, I'm pretty sure failed VM-Entry only
> skips the MSR load/store list processing (because the load lists on VM-Entry are
> processed after the final consistency checks).

Nope, I'm wrong, the SDM explicit states that only EXIT_QUALIFICATION is modified
on VM-Entry failure VM-Exits.  Which means we actually have the opposite bug as
KVM is clearing a bunch of fields.