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

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Message-ID: <18C482AB-D01D-4AAC-BBA2-7A0F7D26ADA8@zytor.com>
Date:   Fri, 17 Feb 2023 20:51:03 -0800
From:   "H. Peter Anvin" <hpa@...or.com>
To:     Ammar Faizi <ammarfaizi2@...weeb.org>, Xin Li <xin3.li@...el.com>
CC:     Dave Hansen <dave.hansen@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Cooper <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>,
        Andy Lutomirski <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 February 17, 2023 8:27:40 PM PST, Ammar Faizi <ammarfaizi2@...weeb.org> wrote:
>On Wed, Feb 15, 2023 at 07:42:47AM +0000, Li, Xin3 wrote:
>> Hi Faizi,
>> 
>> Any update on this patch set?
>
>No comment from HPA. But after the recent discussion with Andrew, I
>think at least it's now clear that we are not going to use "+r"(rsp) to
>avoid the red zone problem.
>
>I am on leave today. Will send revision v8 on Monday.
>
>Thanks,
>

My apologies, I missed your latest response in the torrent of email. The redzone issue is weird; it ought to be breaking all over the place, not just this.

Let me take a quick look at it...