linux-kernel - Re: [RFC PATCH v5 0/2] sysret_rip update for the Intel FRED architecture

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Message-ID: <Y+yO6Da4t0+pQQ03@biznet-home.integral.gnuweeb.org>
Date:   Wed, 15 Feb 2023 14:51:04 +0700
From:   Ammar Faizi <ammarfaizi2@...weeb.org>
To:     Xin Li <xin3.li@...el.com>
Cc:     "H. Peter Anvin" <hpa@...or.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "andrew.cooper3@...rix.com" <andrew.cooper3@...rix.com>,
        Brian Gerst <brgerst@...il.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Shuah Khan <shuah@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        "Lutomirski, Andy" <luto@...nel.org>,
        x86 Mailing List <x86@...nel.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Linux Kselftest Mailing List 
        <linux-kselftest@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v5 0/2] sysret_rip update for the Intel FRED
 architecture

On Wed, Feb 15, 2023 at 07:42:47AM +0000, Li, Xin3 wrote:
> Hi Faizi,
> 
> Any update on this patch set?

Xin,

Before I send the next version, I need an answer for this one:
https://lore.kernel.org/lkml/Y9LfmQ%2Fr1%2FpEP+uv@biznet-home.integral.gnuweeb.org/

I don't think the redzone problem is handled correctly here. Using
"+r" (rsp) constraint doesn't solve the redzone problem.

HPA, Andrew, anybody?

-- 
Ammar Faizi