From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 874B63D6476 for ; Fri, 12 Jun 2026 06:42:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781246529; cv=none; b=kM9KIg3zfi/wro6ckosju08xsMe1bsXBFNLqB16DptxTidFtoIXwgP2B5/WfVpTFHBlvf467MFx0H7LeyGiURFo+2B4ivI1KbxVElL1/t3eWsJBveQ6H/CelRttjFzvi9Xzr+lFWOndGSQ2+iIRLQOw2+VbBnQpnY3COyq26mC8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781246529; c=relaxed/simple; bh=Z3E4RTl8BZeJgYy/Cq1RUjl6WRaWwEUwTBD+SmaOjJ8=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=WKtVV9lUhoUgUtUqVUN0ZtSmv0bPQiaQ17GcV0Ch/aZR9a3dPjVh9YGYYws6DrD27D8sxd/e0D6/QxcpRJorFtk/PohODLHlMt5sRrOUQg8iEhhvWaJwSrK4waboiH86eZok10PA7gSth734vmzp9TdKkXqHKB8rMdyi5W32AEY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=pass smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=bXcPNI/H; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="bXcPNI/H" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=MQaOCOK+I6Ii1Ht8pVaEJwHDh6q1lXdlj2DO9pkTo7Y=; b=bXcPNI/HZ1o56cq0dg3RWqi/xG LzLoqVVQkq4HnKrfiPrJ5t/36QksZwbrfBzt7XPr+BC6Y1MI3hVriG9eG4F3FwlyEGbqYp6bdu82f YyE/IVXb9Cc0POFvG+JszbS8RNHN4jbh7unZakUNQyzzmGFCDI5yiFFU1lexLwqLoIFQsGYGAV5K+ 2Ljwrw5vJFIN4k8ExQrG9vZbTJmuESYBwcOiGNpF/JblRAg7EPJbuUVejlUKhh15xY0QZAj9ttlHE tFfY+9k/g/UK6+jVrBc5WNytyGR/01E01cAdxLwoeh53ZRhJewk2QLDlWSdlyjzHcK2kTStfpJJO7 MJvvNtbQ==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wXvad-00000003HGf-14dx; Fri, 12 Jun 2026 06:42:03 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id D5359300673; Fri, 12 Jun 2026 08:42:02 +0200 (CEST) Date: Fri, 12 Jun 2026 08:42:02 +0200 From: Peter Zijlstra To: Borislav Petkov Cc: Ronan Pigott , linux-kernel@vger.kernel.org, x86@kernel.org Subject: Re: UMIP and clearcpuid= Message-ID: <20260612064202.GN187714@noisy.programming.kicks-ass.net> References: <20260610200054.GDainCdpF585khK77w@fat_crate.local> <3868008f140c843f4443b79d800dba5456df174a@rjp.ie> <20260610235501.GGain5VbwcvpUwCxiw@fat_crate.local> <20260611075311.GH48970@noisy.programming.kicks-ass.net> <20260611160946.GAairdygGg2bMCjibT@fat_crate.local> <20260611183736.GI187714@noisy.programming.kicks-ass.net> <20260612022158.GDaittRqWfYLGwPHNw@fat_crate.local> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260612022158.GDaittRqWfYLGwPHNw@fat_crate.local> On Thu, Jun 11, 2026 at 07:21:58PM -0700, Borislav Petkov wrote: > On Thu, Jun 11, 2026 at 08:37:36PM +0200, Peter Zijlstra wrote: > > Perhaps just one print per task might be a good start? Something like > > so? > > > > I don't think anything hits this hard enough to matter performance wise; > > but the wine stuff can hit them often enough that the dmesg spam is > > annoying, and there's really nothing much you can do about it. > > > > This is somewhat similar to the split lock stuff, yeah, they're bad, but > > nobody is going to be fixing those games. > > > > And UMIP really is useful; these are gnarly instructions you really > > don't want, so as along as it all runs it should be fine. I suppose I > > should go re-enable it on my own machine and actually spend some time on > > it if/when I find another game that flat out doesn't work with the > > emulation. > > Yah, I guess... I don't play them games so meh, but sure, makes sense to me. > I guess we can have people test it and see whether it helps.. maybe... I have kids, playing games is mandatory ;-) At least I got out of having to join Fortnite on account of it not running on Linux (silver lining and all that).