linux-kernel - Re: [RFC 09/17] x86/asm/32: Pull MSR_IA32_SYSENTER_CS update code out of native_load

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Message-ID: <20170912200623.ytigiftoi252pl7a@treble>
Date:   Tue, 12 Sep 2017 15:06:23 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Borislav Petkov <bp@...en8.de>,
        Brian Gerst <brgerst@...il.com>,
        Andrew Cooper <andrew.cooper3@...rix.com>,
        Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [RFC 09/17] x86/asm/32: Pull MSR_IA32_SYSENTER_CS update code
 out of native_load_sp0()

On Wed, Sep 06, 2017 at 02:36:54PM -0700, Andy Lutomirski wrote:
> This causees the MSR_IA32_SYSENTER_CS write to move out of the
> paravirt hook.  This shouldn't affect Xen or lgeust: Xen already
> ignores MSR_IA32_SYSENTER_ESP writes and lguest doesn't support
> SYSENTER at all.  In any event, Xen doesn't support vm86()
> in a useful way.

Thanks to Juergen, lguest is no more :-)

-- 
Josh