linux-kernel - Re: AMD zen microcode updates breaks boot

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: <daa98312-cc66-4c2f-8e64-01358ee99305@kernel.dk>
Date: Mon, 21 Oct 2024 11:00:26 -0600
From: Jens Axboe <axboe@...nel.dk>
To: Borislav Petkov <bp@...en8.de>
Cc: Thomas Gleixner <tglx@...utronix.de>,
 the arch/x86 maintainers <x86@...nel.org>,
 LKML <linux-kernel@...r.kernel.org>,
 "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>
Subject: Re: AMD zen microcode updates breaks boot

On 10/21/24 1:31 AM, Borislav Petkov wrote:
> On Sun, Oct 20, 2024 at 06:47:25PM -0600, Jens Axboe wrote:
>> Works, outside of waiting 3 min for the serial console spewage from the
>> patch! But it boots and it's happy after that. Attached here gzip'ed as
>> it's 1.3M otherwise.
> 
> Thanks for testing.
> 
> Lemme write proper patches, run them everywhere here and give them to you for
> one final testing.

Sounds good, I'll give them a spin once posted.

>> root@...25 ~# echo 1 > /sys/devices/system/cpu/microcode/reload
>> warning: An error occurred while redirecting file '/sys/devices/system/cpu/microcode/reload'
>> open: Permission denied
>>
>> and no output in dmesg.
> 
> Right, you need
> 
> CONFIG_MICROCODE_LATE_LOADING=y
> 
> for that.

Ah gotcha, makes sense.

-- 
Jens Axboe