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

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To: Xin Li <xin3.li@xxxxxxxxx>
Subject: Re: [RFC PATCH v5 0/2] sysret_rip update for the Intel FRED architecture
From: Ammar Faizi <ammarfaizi2@xxxxxxxxxxx>
Date: Wed, 15 Feb 2023 14:51:04 +0700
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>, "Hansen, Dave" <dave.hansen@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, "andrew.cooper3@xxxxxxxxxx" <andrew.cooper3@xxxxxxxxxx>, Brian Gerst <brgerst@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Shuah Khan <shuah@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, "Lutomirski, Andy" <luto@xxxxxxxxxx>, x86 Mailing List <x86@xxxxxxxxxx>, "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>, Linux Kselftest Mailing List <linux-kselftest@xxxxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>
In-reply-to: <SA1PR11MB67342D0472C023619BDEFB26A8A39@SA1PR11MB6734.namprd11.prod.outlook.com>

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@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/

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

References:
- Re: [RFC PATCH v2 2/2] selftests/x86: sysret_rip: Add more syscall tests with respect to `%rcx` and `%r11`
  - From: H. Peter Anvin
- Re: [RFC PATCH v2 2/2] selftests/x86: sysret_rip: Add more syscall tests with respect to `%rcx` and `%r11`
  - From: Ammar Faizi
- [RFC PATCH v5 0/2] sysret_rip update for the Intel FRED architecture
  - From: Ammar Faizi
- RE: [RFC PATCH v5 0/2] sysret_rip update for the Intel FRED architecture
  - From: Li, Xin3
- Re: [RFC PATCH v5 0/2] sysret_rip update for the Intel FRED architecture
  - From: Ammar Faizi
- RE: [RFC PATCH v5 0/2] sysret_rip update for the Intel FRED architecture
  - From: Li, Xin3
- RE: [RFC PATCH v5 0/2] sysret_rip update for the Intel FRED architecture
  - From: H. Peter Anvin
- Re: [RFC PATCH v5 0/2] sysret_rip update for the Intel FRED architecture
  - From: Ammar Faizi
- RE: [RFC PATCH v5 0/2] sysret_rip update for the Intel FRED architecture
  - From: Li, Xin3
- RE: [RFC PATCH v5 0/2] sysret_rip update for the Intel FRED architecture
  - From: Li, Xin3

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