Re: [PATCH 4.19 72/98] x86/CPU/AMD: Clear RDRAND CPUID bit on AMD family 15h/16h

From: Pavel Machek
Date: Wed Aug 28 2019 - 08:09:40 EST

On Wed 2019-08-28 14:00:24, Borislav Petkov wrote:
> On Wed, Aug 28, 2019 at 01:49:47PM +0200, Pavel Machek wrote:
> > AMD screwed this up,
> Except that it wasn't AMD who screwed up but BIOS on *some* laptops.

Yes, and now AMD has patch to break it on *all* machines.

Hmm. "Get random data" instruction that fails to return random data,
depending on BIOS... (and even indicates success, IIRC)... Sounds like
CPU vendor screwup to me.

And they can also fix it up. If re-initing random generator is
impossible from kernel, surely CPU microcode can be either updated to
do the init automatically, or at least allow kernel to do the init.

Best regards,
DENX Software Engineering GmbH, Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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