linux-kernel - Re: [PATCH] x86: also disable FSRM if ERMS is disabled

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Message-ID: <Y7VlZsaWz4/b6Phf@zn.tnic>
Date:   Wed, 4 Jan 2023 12:39:18 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Jiri Slaby <jirislaby@...nel.org>
Cc:     Daniel Verkamp <dverkamp@...omium.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org, Tony Luck <tony.luck@...el.com>
Subject: Re: [PATCH] x86: also disable FSRM if ERMS is disabled

On Wed, Jan 04, 2023 at 08:43:51AM +0100, Jiri Slaby wrote:
> Let me resurrect this thread... Our customer has an AMD CPU which has indeed
> both capabilities under normal circumstances. But they have a cool UEFI BIOS
> too. They say:
> 
> """
> In AMD platform, while disalbe ERMS(Enhanced Rep MOVSB/STOSB) in UEFI
> (system setup -> processor -> Enhanced Rep MOVSB/STOSB), the OS can't boot
> normally.

Any particular reason they're disabling ERMS?

What do they set FSRM to?

-- 
Regards/Gruss,
    Boris.

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