linux-kernel - Re: [PATCH] KVM: nVMX: Fix CR4 after VMLAUNCH/VMRESUME failure

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Message-ID: <CALMp9eRHzmU3Kfr0cxhy2Hrr-RybnjrsKHByoV27TdYffuuC3w@mail.gmail.com>
Date:   Tue, 6 Feb 2018 08:58:10 -0800
From:   Jim Mattson <jmattson@...gle.com>
To:     Wanpeng Li <kernellwp@...il.com>
Cc:     kvm list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Radim Krcmar <rkrcmar@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH] KVM: nVMX: Fix CR4 after VMLAUNCH/VMRESUME failure

On Mon, Feb 5, 2018 at 4:57 PM, Wanpeng Li <kernellwp@...il.com> wrote:

> This is effective one, what I restore in this patch is
> achitectural/guest visible.

This patch doesn't "restore" the guest visible CR4 to its value at the
time of VMLAUNCH/VMRESUME. It loads a new CR4 value from the vmcs12.
That behavior is incorrect.