Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
MIME-Version: 1.0
In-Reply-To: <09986c98c9655f1542768ecfda644ac821e67a57.1540369608.git.jsteckli@amazon.de>
References: <09986c98c9655f1542768ecfda644ac821e67a57.1540369608.git.jsteckli@amazon.de>
From:   Jim Mattson <jmattson@google.com>
Date:   Thu, 25 Oct 2018 10:02:08 -0700
Message-ID: <CALMp9eQ=+jEabpDqa-a7WP7LVfTjmpW1ymWrVYeSxH4O4XOmyA@mail.gmail.com>
Subject: Re: [PATCH 1/4] kvm, vmx: move CR2 context switch out of assembly path
To:     Julian Stecklina <jsteckli@amazon.de>
Cc:     kvm list <kvm@vger.kernel.org>,
        Paolo Bonzini <pbonzini@redhat.com>, js@alien8.de,
        LKML <linux-kernel@vger.kernel.org>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Wed, Oct 24, 2018 at 1:28 AM, Julian Stecklina <jsteckli@amazon.de> wrot=
e:
> The VM entry/exit path is a giant inline assembly statement. Simplify it
> by doing CR2 context switching in plain C. Move CR2 restore behind IBRS
> clearing, so we reduce the amount of code we execute with IBRS on.
>
> Signed-off-by: Julian Stecklina <jsteckli@amazon.de>
> Reviewed-by: Jan H. Sch=C3=B6nherr <jschoenh@amazon.de>
> Reviewed-by: Konrad Jan Miller <kjm@amazon.de>
Reviewed-by: Jim Mattson <jmattson@google.com>