linux-kernel - Re: [PATCH 1/4] kvm, vmx: move CR2 context switch out of assembly path

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Message-ID: <CALMp9eQ=+jEabpDqa-a7WP7LVfTjmpW1ymWrVYeSxH4O4XOmyA@mail.gmail.com>
Date:   Thu, 25 Oct 2018 10:02:08 -0700
From:   Jim Mattson <jmattson@...gle.com>
To:     Julian Stecklina <jsteckli@...zon.de>
Cc:     kvm list <kvm@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>, js@...en8.de,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] kvm, vmx: move CR2 context switch out of assembly path

On Wed, Oct 24, 2018 at 1:28 AM, Julian Stecklina <jsteckli@...zon.de> wrote:
> 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@...zon.de>
> Reviewed-by: Jan H. Schönherr <jschoenh@...zon.de>
> Reviewed-by: Konrad Jan Miller <kjm@...zon.de>
Reviewed-by: Jim Mattson <jmattson@...gle.com>