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 637B528E7 for ; Sun, 23 Mar 2025 19:51:24 +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=1742759487; cv=none; b=s5sI32mwU7V5pcBO0qlScu78NbzdTj7bvTKMXI+OC0sekhtIbdgGgX5o0PYGqr7cq4fM3TPwx2hJyK1kZt4Jha77OH90yqXyEeVnHtYWB56thhssYfT3mUQabgY5u+F5c3CvFIZv2dqcx2ZsdnKAgMXJPeMZP/Yj5j7x31PXTfQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742759487; c=relaxed/simple; bh=2z8DIs/MfUWa4qmP6/wlHkaufzH2IeAdTj7tuhZKYfo=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=CDufFBvlDEfesiTMMiS87pI575++C1USfVzodH72GW9SttFQN/lCdsveNiEQluw8evt3FOYcnS2HC28/zoobvcqyS9Dy/iGqCpU2EJeCxdKztCCQtjemqA++ddDU+wfIYUYRW0gOtLdrEhfIYsc2wvIHXH3SyQSNbh91pSFaHYQ= 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=UH2jBKc6; 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="UH2jBKc6" Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.alien8.de (SuperMail on ZX Spectrum 128k) with ESMTP id EA50A40E01FF; Sun, 23 Mar 2025 19:51:21 +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 cG2-PWExDVlH; Sun, 23 Mar 2025 19:51:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=alien8; t=1742759477; bh=vQw69BVbIRV1aaHYirCZ/+GJ4s80ZDu6SI8BvHKYn8A=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=UH2jBKc6jVqAIqZubq7aY1UJ3vXE5wMiTbd6k8MXHRVQefXBfpw+asyn4ui9kkVxg fjxrj20aZesbat3Pftq70yxH4ozNE65xVl8nX9oBhOlkgqGz5ZqP0/PipPaQj6SWKG hEg4nL3H1bOHJhjTugbWmceHCXQVr+e2g66DQmxkYgt0Y5SwqzaYP05yVhH2oB3G6R f4ngt764A3gM481M+IXAdwkelzftbVD9YyLUujpKxtGsdIwebZY6zpqjdUWz3H6KNP 8prqHf8PS3qLs/RYardt9/JxxlpowVTyaxxLRozsrv16z+TrVa2IqUTw/r3PbKmJjI gv4q9+yVFBY9fngGdvGaoVyM7bWVGE6KwNhbuhPTOe0mLnGNi/FUar+osX0r4w0knL ubZckyZAJTfjp5dcpgezyAWmm4uXDWxFNib86ptdn305vHmJMoLcY+jApwms0xxB0i aRa/CT8mChQvNDcX3m+HJgeRPkVHH6Hxl+9V0BWSng6UDlbXe82oFEvJIfbpbsQyEC Z1yPxEik31BBsINuWwVqAFpS/7L3I5EZFXoX0qaQKcEPVkG4s0BXG0jyl9ASrXEzaQ qEZz9WSh9mNTbA4jBwsxfKdDO37HTZrVtx4VP6LRo8I79yscKSILRbcw50iLzDX3r/ 4fhVH1BVeTBI4gyUSdlqBNZM= Received: from zn.tnic (pd95303ce.dip0.t-ipconnect.de [217.83.3.206]) (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 86A3240E0196; Sun, 23 Mar 2025 19:51:08 +0000 (UTC) Date: Sun, 23 Mar 2025 20:51:02 +0100 From: Borislav Petkov To: "Guilherme G. Piccoli" Cc: Thomas Gleixner , "H. Peter Anvin" , x86@kernel.org, linux-kernel@vger.kernel.org, mingo@redhat.com, dave.hansen@linux.intel.com, kernel@gpiccoli.net, kernel-dev@igalia.com Subject: Re: [PATCH] x86/tsc: Add debugfs entry to mark TSC as unstable after boot Message-ID: <20250323195102.GDZ-BmJgDWLieuUaJs@fat_crate.local> References: <20250226132733.58327-1-gpiccoli@igalia.com> <1238b1d0-275c-9117-a2e3-5e7684404980@igalia.com> <87iko213qo.ffs@tglx> <20250323181444.GCZ-BPlCAhtO7AIsS7@fat_crate.local> <8247f64e-316d-0eca-9e5d-0c63c7dfc862@igalia.com> 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: <8247f64e-316d-0eca-9e5d-0c63c7dfc862@igalia.com> On Sun, Mar 23, 2025 at 04:21:44PM -0300, Guilherme G. Piccoli wrote: > This is great to hear - is there any starting point model that you know > AMD introduced/is introducing TSC_ADJUST? Zen5. > We don't know yet what's going on, some TSC skews reported eventually in > some machines, in a fleet - but "old" processors, Zen 1st gen. Once things > are more clear, definitely could provide a more mature report of the issue. Sure. Zen1 should not have TSC problems either. If it does, whack BIOS people. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette