linux-kernel - Re: [PATCH v2] x86/its: use Sapphire Rapids+ feature to opt out

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Message-ID: <aedb4d0f-8361-4366-9513-b01db6e9c7ae@intel.com>
Date: Fri, 17 Oct 2025 07:02:36 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Jon Kohler <jon@...anix.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, Borislav Petkov <bp@...en8.de>,
 Peter Zijlstra <peterz@...radead.org>, Josh Poimboeuf <jpoimboe@...nel.org>,
 Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
 Jonathan Corbet <corbet@....net>, Ingo Molnar <mingo@...hat.com>,
 Dave Hansen <dave.hansen@...ux.intel.com>, "x86@...nel.org"
 <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
 Brian Gerst <brgerst@...il.com>, Brendan Jackman <jackmanb@...gle.com>,
 "Ahmed S. Darwish" <darwi@...utronix.de>,
 Alexandre Chartre <alexandre.chartre@...cle.com>,
 "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] x86/its: use Sapphire Rapids+ feature to opt out

On 10/17/25 05:21, Jon Kohler wrote:
> Using that documentation to improve my approach, how about
> this instead, where A) we have better code comments and B) we
> also check eIBRS enablement? 

No thanks.

Sounds like you are doing the right thing and fixing the hypervisor
that's not exposing thing that it should.