linux-kernel - Re: [PATCH v1 2/4] x86/fred: Write to FRED MSRs with wrmsrns()

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <ada20b3c-2935-4d4f-8daf-ba7b9a533877@zytor.com>
Date: Wed, 3 Jul 2024 22:57:29 -0700
From: Xin Li <xin@...or.com>
To: Andrew Cooper <andrew.cooper3@...rix.com>,
        "H. Peter Anvin"
 <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
        dave.hansen@...el.com
Cc: linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
        dave.hansen@...ux.intel.com, x86@...nel.org, peterz@...radead.org,
        nik.borisov@...e.com, houwenlong.hwl@...group.com
Subject: Re: [PATCH v1 2/4] x86/fred: Write to FRED MSRs with wrmsrns()

On 7/3/2024 9:18 AM, Andrew Cooper wrote:
> On 03/07/2024 5:06 pm, H. Peter Anvin wrote:
>> I believe tglx declared53  to use them unconditionally since FRED depends on WRMSRNS (and the kernel enforces that.)
> 
> I know that Linux has chosen to have this as a software-enforced
> requirement.
> 
> The dependency does not exist architecturally, and just because it
> happens to be true on Intel processors doesn't mean it's true of other
> implementations.

Won't it be way better if we could have all x86 vendors agree on it?