linux-kernel - Re: [PATCH 0/2] x86/rdrand: implement sanity check for RDSEED

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Message-ID: <20250313173205.GIZ9MWlT9ElklGPSrD@fat_crate.local>
Date: Thu, 13 Mar 2025 18:32:05 +0100
From: Borislav Petkov <bp@...en8.de>
To: Mikhail Paulyshka <me@...aill.net>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] x86/rdrand: implement sanity check for RDSEED

On Wed, Mar 12, 2025 at 03:31:28PM +0300, Mikhail Paulyshka wrote:
> On the AMD Cyan Skillfish (Family 0x17 Model 0x47 Stepping 0x0), which 
> is a Zen2-based APU found on the AMD BC-250 board, there is a situation 
> where RDRAND works fine, but RDSEED generates FF.

On every read? Or only sometimes?

Is CF clear when it returns FF?

Thx.

-- 
Regards/Gruss,
    Boris.

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