linux-kernel - Re: [PATCH 2/2] x86/random: Issue a warning if RDRAND or RDSEED fails

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Message-ID: <9c6f045e-6e14-49a2-973d-276e8a5bce84@intel.com>
Date: Tue, 30 Jan 2024 10:37:15 -0800
From: Dave Hansen <dave.hansen@...el.com>
To: "Jason A. Donenfeld" <Jason@...c4.com>
Cc: "Reshetova, Elena" <elena.reshetova@...el.com>,
 "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
 "H. Peter Anvin" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>,
 Theodore Ts'o <tytso@....edu>,
 Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>,
 "Nakajima, Jun" <jun.nakajima@...el.com>,
 Tom Lendacky <thomas.lendacky@....com>, "Kalra, Ashish"
 <ashish.kalra@....com>, Sean Christopherson <seanjc@...gle.com>,
 "linux-coco@...ts.linux.dev" <linux-coco@...ts.linux.dev>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] x86/random: Issue a warning if RDRAND or RDSEED fails

On 1/30/24 10:23, Jason A. Donenfeld wrote:
>> Any chance you could share some more information about the environment
>> where you're seeing this?  It'd be good to reconcile what you're seeing
>> with how the hardware is expected to behave.
> That is already in this thread already. Maybe catch up on the whole
> thing and then jump back in?
> https://lore.kernel.org/all/Zbjw5hRHr_E6k18r@zx2c4.com/

Gah, sorry about that.  I can reproduce what you're seeing, and it does
seem widespread.  Let me do some digging and see where we got our wires
crossed.