From: Christopher Snowhill <chris@kode54.net>
To: "Jason A. Donenfeld" <Jason@zx2c4.com>
Cc: Borislav Petkov <bp@alien8.de>, Gregory Price <gourry@gourry.net>,
x86@kernel.org, linux-kernel@vger.kernel.org, tglx@linutronix.de,
mingo@redhat.com, dave.hansen@linux.intel.com, hpa@zytor.com,
peterz@infradead.org, mario.limonciello@amd.com,
riel@surriel.com, yazen.ghannam@amd.com, me@mixaill.net,
kai.huang@intel.com, sandipan.das@amd.com, darwi@linutronix.de,
stable@vger.kernel.org
Subject: Re: [PATCH v2] x86/amd: Disable RDSEED on AMD Zen5 because of an error.
Date: Mon, 03 Nov 2025 02:22:44 -0800 [thread overview]
Message-ID: <176216536464.37138.975167391934381427@copycat> (raw)
In-Reply-To: <aPT9vUT7Hcrkh6_l@zx2c4.com>
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On Sun 19 Oct 2025 05:03:25 PM , Jason A. Donenfeld wrote:
> On Sun, Oct 19, 2025 at 05:00:27PM +0200, Borislav Petkov wrote:
> > On Sun, Oct 19, 2025 at 04:46:06PM +0200, Jason A. Donenfeld wrote:
> > > While your team is checking into this, I'd be most interested to know
> > > one way or the other whether this affects RDRAND too.
> >
> > No it doesn't, AFAIK. The only one affected is the 32-bit or 16-bit dest
> > operand version of RDSEED. Again, AFAIK.
>
> Oh good. So on 64-bit kernels, the impact to random.c is zilch.
>
> Jason
>
Although apparently, the patch does break userspace for any distribution
building packages with -march=znver4
- Christopher
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next prev parent reply other threads:[~2025-11-03 10:22 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-18 2:40 Gregory Price
2025-10-18 10:03 ` Borislav Petkov
2025-10-19 14:46 ` Jason A. Donenfeld
2025-10-19 15:00 ` Borislav Petkov
2025-10-19 15:03 ` Jason A. Donenfeld
2025-11-03 10:22 ` Christopher Snowhill [this message]
2025-11-03 12:03 ` Borislav Petkov
2025-11-03 23:55 ` Christopher Snowhill
2025-11-04 13:21 ` Borislav Petkov
2025-11-04 14:28 ` Jason A. Donenfeld
2025-11-04 15:00 ` Jason A. Donenfeld
2025-11-04 18:08 ` Thiago Macieira
2025-11-04 21:56 ` Jason A. Donenfeld
2025-11-04 23:50 ` Thiago Macieira
2025-11-05 1:58 ` Jason A. Donenfeld
2025-11-05 16:41 ` Thiago Macieira
2025-11-07 19:13 ` Jason A. Donenfeld
2025-11-07 19:55 ` Thiago Macieira
2025-11-07 23:07 ` Jason A. Donenfeld
2025-11-07 23:11 ` Thiago Macieira
2025-11-08 0:04 ` Jason A. Donenfeld
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