From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 02870C43217 for ; Thu, 17 Mar 2022 12:55:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234211AbiCQM4s (ORCPT ); Thu, 17 Mar 2022 08:56:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41314 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234199AbiCQM4I (ORCPT ); Thu, 17 Mar 2022 08:56:08 -0400 Received: from wp530.webpack.hosteurope.de (wp530.webpack.hosteurope.de [IPv6:2a01:488:42:1000:50ed:8234::]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DE9ACE6C57; Thu, 17 Mar 2022 05:54:17 -0700 (PDT) Received: from ip4d144895.dynamic.kabel-deutschland.de ([77.20.72.149] helo=[192.168.66.200]); authenticated by wp530.webpack.hosteurope.de running ExIM with esmtpsa (TLS1.3:ECDHE_RSA_AES_128_GCM_SHA256:128) id 1nUpdu-0003Ys-Jj; Thu, 17 Mar 2022 13:54:14 +0100 Message-ID: Date: Thu, 17 Mar 2022 13:54:11 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.5.0 Subject: Re: [REGRESSION] Too-low frequency limit for AMD GPU PCI-passed-through to Windows VM Content-Language: en-US To: James Turner Cc: Alex Deucher , "Lazar, Lijo" , "Deucher, Alexander" , "regressions@lists.linux.dev" , "kvm@vger.kernel.org" , Greg KH , "Pan, Xinhui" , LKML , "amd-gfx@lists.freedesktop.org" , Alex Williamson , "Koenig, Christian" References: <87ee57c8fu.fsf@turner.link> <87a6ftk9qy.fsf@dmarc-none.turner.link> <87zgnp96a4.fsf@turner.link> <87czkk1pmt.fsf@dmarc-none.turner.link> <87sftfqwlx.fsf@dmarc-none.turner.link> <87ee4wprsx.fsf@turner.link> <4b3ed7f6-d2b6-443c-970e-d963066ebfe3@amd.com> <87pmo8r6ob.fsf@turner.link> <5a68afe4-1e9e-c683-e06d-30afc2156f14@leemhuis.info> <87pmnnpmh5.fsf@dmarc-none.turner.link> <092b825a-10ff-e197-18a1-d3e3a097b0e3@leemhuis.info> <877d96to55.fsf@dmarc-none.turner.link> <87lexdw8gd.fsf@turner.link> From: Thorsten Leemhuis In-Reply-To: <87lexdw8gd.fsf@turner.link> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-bounce-key: webpack.hosteurope.de;regressions@leemhuis.info;1647521657;08da124f; X-HE-SMSGID: 1nUpdu-0003Ys-Jj Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 13.03.22 19:33, James Turner wrote: > >> My understanding at this point is that the root problem is probably >> not in the Linux kernel but rather something else (e.g. the machine >> firmware or AMD Windows driver) and that the change in f9b7f3703ff9 >> ("drm/amdgpu/acpi: make ATPX/ATCS structures global (v2)") simply >> exposed the underlying problem. FWIW: that in the end is irrelevant when it comes to the Linux kernel's 'no regressions' rule. For details see: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/Documentation/admin-guide/reporting-regressions.rst https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/Documentation/process/handling-regressions.rst That being said: sometimes for the greater good it's better to not insist on that. And I guess that might be the case here. > I'm not sure where to go from here. This issue isn't much of a concern> for me anymore, since blacklisting `amdgpu` works for my machine. At> this point, my understanding is that the root problem needs to be fixed> in AMD's Windows GPU driver or Dell's firmware, not the Linux kernel. If> any of the AMD developers on this thread would like to forward it to the> AMD Windows driver team, I'd be happy to work with AMD to fix the issue> properly. In that case I'll drop it from the list of regressions, unless what I wrote above makes you change your mind. #regzbot invalid: firmware issue exposed by kernel change, user seems to be happy with a workaround Thx everyone who participated in handling this. Ciao, Thorsten