linux-kernel - Re: [PATCH v7 05/27] x86/fpu/xstate: Add XSAVES system states for shadow stack

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Date:   Fri, 07 Jun 2019 09:14:50 -0700
From:   Yu-cheng Yu <yu-cheng.yu@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-mm@...ck.org,
        linux-arch@...r.kernel.org, linux-api@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        Andy Lutomirski <luto@...capital.net>,
        Balbir Singh <bsingharora@...il.com>,
        Borislav Petkov <bp@...en8.de>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Eugene Syromiatnikov <esyr@...hat.com>,
        Florian Weimer <fweimer@...hat.com>,
        "H.J. Lu" <hjl.tools@...il.com>, Jann Horn <jannh@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Kees Cook <keescook@...omium.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Oleg Nesterov <oleg@...hat.com>, Pavel Machek <pavel@....cz>,
        Randy Dunlap <rdunlap@...radead.org>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Vedvyas Shanbhogue <vedvyas.shanbhogue@...el.com>,
        Dave Martin <Dave.Martin@....com>
Subject: Re: [PATCH v7 05/27] x86/fpu/xstate: Add XSAVES system states for
 shadow stack

On Fri, 2019-06-07 at 09:07 +0200, Peter Zijlstra wrote:
> On Thu, Jun 06, 2019 at 01:06:24PM -0700, Yu-cheng Yu wrote:
> > Intel Control-flow Enforcement Technology (CET) introduces the
> > following MSRs.
> > 
> >     MSR_IA32_U_CET (user-mode CET settings),
> >     MSR_IA32_PL3_SSP (user-mode shadow stack),
> >     MSR_IA32_PL0_SSP (kernel-mode shadow stack),
> >     MSR_IA32_PL1_SSP (Privilege Level 1 shadow stack),
> >     MSR_IA32_PL2_SSP (Privilege Level 2 shadow stack).
> > 
> > Introduce them into XSAVES system states.
> > 
> > Signed-off-by: Yu-cheng Yu <yu-cheng.yu@...el.com>
> > ---
> >  arch/x86/include/asm/fpu/types.h            | 22 +++++++++++++++++++++
> >  arch/x86/include/asm/fpu/xstate.h           |  4 +++-
> >  arch/x86/include/uapi/asm/processor-flags.h |  2 ++
> >  arch/x86/kernel/fpu/xstate.c                | 10 ++++++++++
> >  4 files changed, 37 insertions(+), 1 deletion(-)
> 
> And yet, no changes to msr-index.h !?

You are right.  I will move msr-index.h changes to here.

Yu-cheng