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From: "Jason A. Donenfeld" <Jason@zx2c4.com>
To: linux-kernel@vger.kernel.org
Cc: linux-tip-commits@vger.kernel.org, stable@vger.kernel.org,
	Gregory Price <gourry@gourry.net>,
	"Borislav Petkov (AMD)" <bp@alien8.de>,
	x86@kernel.org
Subject: Re: [tip: x86/urgent] x86/CPU/AMD: Add RDSEED fix for Zen5
Date: Thu, 30 Oct 2025 22:48:23 +0100	[thread overview]
Message-ID: <aQPdJ7CbIRI6dj0Q@zx2c4.com> (raw)
In-Reply-To: <aQOo3LcsdU23q1i2@zx2c4.com>

On Thu, Oct 30, 2025 at 07:05:16PM +0100, Jason A. Donenfeld wrote:
> I didn't see this on LKML or any mailing list before this appeared in
> tip. Did I miss something?

Also, by the way,

Link: https://www.amd.com/en/resources/product-security/bulletin/amd-sb-7055.html
> Until the microcode patch is deployed, the following software
> workaround options could be used: 
>
> [...]
>
> - Software can treat RDSEED returning 0 equivalent to when CF=0. Retry
>   RDSEED later until a non-zero value is returned with CF=1

You sure that's such a good idea?

Jason

  reply	other threads:[~2025-10-30 21:48 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-10-28 12:01 [tip: x86/urgent] x86/CPU/AMD: Add RDSEED fix for Zen5 tip-bot2 for Gregory Price
2025-10-30 18:05 ` Jason A. Donenfeld
2025-10-30 21:48   ` Jason A. Donenfeld [this message]
2025-11-03 13:59 ` Peter Jung
2025-11-03 14:28   ` Borislav Petkov
2025-11-03 16:12   ` Thomas Gleixner
2025-11-24 22:18   ` Pavel Machek

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