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

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Message-ID: <20251020192605.yqg5mmvah2fzyjvu@desk>
Date: Mon, 20 Oct 2025 12:26:05 -0700
From: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
To: Dave Hansen <dave.hansen@...el.com>
Cc: Jon Kohler <jon@...anix.com>, Sean Christopherson <seanjc@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	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] x86/its: use Sapphire Rapids+ feature to opt out

On Mon, Oct 20, 2025 at 09:21:41AM -0700, Dave Hansen wrote:
> On 10/20/25 09:05, Jon Kohler wrote:
> > Was running into some testing issues with my qemu change internally,
> > but I’ll get that out this week once I clear them.
> 
> BTW, if there are folks out there that are working on things like QEMU
> and want more formal or regular notification from vendors that a FOO_NO
> bit has been added, that can probably be arranged.
> 
> The real issue here is that nobody cared enough to get QEMU to
> comprehend ITS_NO right after the embargo was lifted, right?

ITS_NO support was added to QEMU right after the embargo was lifted:

https://lore.kernel.org/all/8c1797e488b42650f62d816f25c58726eb522fad.1745946029.git.pawan.kumar.gupta@linux.intel.com/