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

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Message-ID: <20241021073140.GAZxYDXCk02lSrG3-T@fat_crate.local>
Date: Mon, 21 Oct 2024 09:31:40 +0200
From: Borislav Petkov <bp@...en8.de>
To: Jens Axboe <axboe@...nel.dk>
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 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.

> I get:
> 
> 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.

Thx.

-- 
Regards/Gruss,
    Boris.

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