From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 960BF3DA7C3 for ; Fri, 14 Aug 2026 12:19:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786709993; cv=none; b=pfBsj/ylqqe7p5V2PxLsh3/vt7R7yg4XRlHFEeGV55uhrV+IU3wKspLx3MlJXekWU3wEowQTprluVCo7dkEdqaYaNrGppTz+ySPMADny+IUrX4bGSN+b3Y1s0rONKdiQbbiYlwQAfTSjs6dTxVKdJ4g0HBafqK7/UddOfPlLcN4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786709993; c=relaxed/simple; bh=VUtGNqXWvyAJIrWJsI0Hp9TtwcugVvbL2hDDb2JOZAE=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=KHCbl9n9iMAQch8+JgarFLmYw0HXRZQ4h69nHgbu+L1STrmXonzXck9k340DUAaj9/YbKjr4GVgfjW0/L1kWpB42uN9g9xbyYQlQV+OHHxDyp6IWNkAXPkPEn8EhmPgMQProkyHBW/xvMceS2M4jqQcw7lFZTEyxQVUukJcgrLU= 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=dPJIWFUZ; arc=none smtp.client-ip=90.155.92.199 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="dPJIWFUZ" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; 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=CQp4p9edTdeSil5O+cvn0gdwv6NrG4CNakXof33eO0s=; b=dPJIWFUZZLGqKPiMrMBEHkDl8y VJil6FFes+j0jArtdCZYj9qXYFvUQsTWZFbEa39RBLF+U+edEFy3FbY/sAPuzQ6WqkX+22XECmWQM BIvhcC1tVST3ZSGoLbqrBYAm376fvmcwFidCCAymjdxik04+XvgPlLmn2VJgt8AJfvRcHGtHpVieT W7VNySR9QGiqtLJCtbmxMg2EjblalQkGrhyE104uvOJpNUJHQsuP8F0xPkerxrOREaU5x5ZLpEZZO fPdpMEn1hFCNQW2z1kZDaoYL3mdBOiQ7RfsFaXsqE7TLmrZSW9Cjs8tZ6K1F5IPApVs+p8X9qjmaO SEPvti0Q==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.99.2 #2 (Red Hat Linux)) id 1wuqt2-0000000GuGQ-1zMg; Fri, 14 Aug 2026 12:19:48 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id B9F50300323; Fri, 14 Aug 2026 14:19:47 +0200 (CEST) Date: Fri, 14 Aug 2026 14:19:47 +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: <20260814121947.GJ788244@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> 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: <20260611183736.GI187714@noisy.programming.kicks-ass.net> On Thu, Jun 11, 2026 at 08:37:36PM +0200, Peter Zijlstra wrote: > On Thu, Jun 11, 2026 at 09:09:46AM -0700, Borislav Petkov wrote: > > > > It is really annoying having to disable UMIP though, its bugged me, just > > > not enough to ever actually do anything about it. > > > > Well, what else could we do? Whitelist processes, make it more fine-grained or > > so...? > > 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. Apparently some games are hitting this rather hard: https://www.reddit.com/r/linux_gaming/comments/1qdj79f/is_mhwilds_performance_throttled_by_an_expensive/ That seems to suggest the game is doing DLC checks on *EVERY* frame while in a settlement. That's absolutely bonkers, but whatever.