From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.alien8.de (mail.alien8.de [65.109.113.108]) (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 2C495340A6B for ; Fri, 12 Jun 2026 02:22:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=65.109.113.108 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781230940; cv=none; b=YjPgZyICswDerSUz5KAdDr5LLLkqt99DTelTpp0KdvH1o+Zp2crinPIGpsQKXryO4fY2B5bE4eL3a7XRDZPfxFVmy29SgCdlBIJ4yN6588WthRJOLv0uvTA7LA7BQo6W3IITkP8Imek8PX63sJLndrZKrzjUj1Ho+40vtMnS1ok= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781230940; c=relaxed/simple; bh=V4m+ip/gU/Ih1DDN+e8oU2r+hjhPpe+wj5ps2UFF5jM=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=bFxZ638rV+gfTbJpkzUCRDlmxAZC48VGCQ2IdMMhAiVpuZ4+AnXSv3OwTCMTZpCwFM5VFTR9EX4nIsu+kPzULudwC/1XJU4enU9odLOJf12UG3HgJSL+90DZIKah7fZ6M2zPqwMbfmn6enU4ygJ5n/9OJKbfxlw8+5Jnn3EwP3I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=alien8.de; spf=pass smtp.mailfrom=alien8.de; dkim=pass (4096-bit key) header.d=alien8.de header.i=@alien8.de header.b=F+oS1upw; arc=none smtp.client-ip=65.109.113.108 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=alien8.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=alien8.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (4096-bit key) header.d=alien8.de header.i=@alien8.de header.b="F+oS1upw" Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.alien8.de (SuperMail on ZX Spectrum 128k) with ESMTP id EB83340E0176; Fri, 12 Jun 2026 02:22:15 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at mail.alien8.de Authentication-Results: mail.alien8.de (amavisd-new); dkim=pass (4096-bit key) header.d=alien8.de Received: from mail.alien8.de ([127.0.0.1]) by localhost (mail.alien8.de [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id EA2Wz5rfP1wc; Fri, 12 Jun 2026 02:22:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=alien8; t=1781230925; bh=zv4MhbDUryyam5HoC741Nh3zErM8NzTxvBSQOd8HM+Q=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=F+oS1upw8XnwfaIzVN8ri3lYXwFVoZahf+fBNunoGzynQKZq0esU+34dDofWZV3jF 3YmbW1zB54vEM6nF57ZxpO1uU5ssi627KxAEFEwih0ECT5Vboj7F7EfZl2EdsdOwxq UVHqflSKZzbc3sHh4xEmoyz8GZVTuYzdxzs2R4SIS26y2ZJY8RXZfptGif2g+LKGYW SNHhbMZa9UAJ/Zgg/AJdTjB1vW+CikGoOQQBmzFUUt7Q4nLsNEDZirHpLM8yS+C7Ci Opc1HT8+oXZqTTNr+Dv/y8UOsCOlUYihCqlFqJ16pWIF+SvEs5Xgrpr2ljCb2gfUER bMDpwp9mb2mHgPulENNquNdRLDV/VuDfYJ9GV1mToirA3sevbftbADFMU88WFaN5PW UUGnHp2RPA8/rZeJQGkYEIAcYQAviCC1b2XquhJdJOxkLRQm8aqI2C0HAov7sotuCV dLIVldwscF1ieRz+2LqDkG1DQ6eHvCq0dDFhdnpn4hqjB/RlPQTP+y2lxos6QKSZjY BWhvtzRZFIiL/Fba5etcSCmNPTBgdP1Ooh5OPBqXalOWV+hUuy0dPgv4tU6oecWVqn Y+nHFhPKEg7zLdQTrZfIlLUKahOpJIEGAV1zKy9d8Uoj4iTn96yE1/xOT93rQgjgm4 1qXRtaJ5DIbPpLG3xm8TPzkM= Received: from stx.tnic (unknown [IPv6:2600:1700:38ca:c00::1a]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature ECDSA (P-256) server-digest SHA256) (No client certificate requested) by mail.alien8.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 5E64740E015B; Fri, 12 Jun 2026 02:22:01 +0000 (UTC) Date: Thu, 11 Jun 2026 19:21:58 -0700 From: Borislav Petkov To: Peter Zijlstra Cc: Ronan Pigott , linux-kernel@vger.kernel.org, x86@kernel.org Subject: Re: UMIP and clearcpuid= Message-ID: <20260612022158.GDaittRqWfYLGwPHNw@fat_crate.local> 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=utf-8 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: > 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... Thx. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette