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 X-Spam-Level: X-Spam-Status: No, score=-4.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C7B24C433DB for ; Thu, 25 Mar 2021 21:52:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7F5B261A27 for ; Thu, 25 Mar 2021 21:52:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231148AbhCYVwV (ORCPT ); Thu, 25 Mar 2021 17:52:21 -0400 Received: from mail.kernel.org ([198.145.29.99]:37546 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231233AbhCYVvz (ORCPT ); Thu, 25 Mar 2021 17:51:55 -0400 Received: by mail.kernel.org (Postfix) with ESMTPS id 28D0761A49 for ; Thu, 25 Mar 2021 21:51:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1616709115; bh=bwFIOzzkPaRKsaCL9jS1JDpgiNCXMLMTYXZxa/QVGf8=; h=From:To:Subject:Date:In-Reply-To:References:From; b=XXeq7FemFZmXOlTMvcW8iIeTqqHC9jwUkNvyRf0RPqdMBY4K7hywiVMHRWXEf39ZN r80YISCLeDd8AFpXghuK9Iq6RYbGlB1py6NhHh+lrOf/OWmCgrQ6BJJ2cEKmD3IsGJ LFrmraJkcKlvq7gGC1jwc1PP8WIu7o3CwFR8dyfJMHRpDs5i5OwNhVTh8VR3OYGv9J aTf66nfd8U8Y246Fr0uIGJcjSytWl1pVXmqY20GGA5qO1UVvc5MkRCYx/Pvk/dVx/z hl5laiyVmud3gM3WcKS0c6RvSQ4IlSFPGayTh8flVvxg6zLLhaVKuwKIX+sbCK3f1h Upe8BsBBxkUBA== From: bugzilla-daemon@bugzilla.kernel.org To: kvm@vger.kernel.org Subject: [Bug 201753] AMD-Vi: Unable to write to IOMMU perf counter Date: Thu, 25 Mar 2021 21:51:54 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: AssignedTo virtualization_kvm@kernel-bugs.osdl.org X-Bugzilla-Product: Virtualization X-Bugzilla-Component: kvm X-Bugzilla-Version: unspecified X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: david.coe@live.co.uk X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P1 X-Bugzilla-Assigned-To: virtualization_kvm@kernel-bugs.osdl.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugzilla.kernel.org/ Auto-Submitted: auto-generated MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org https://bugzilla.kernel.org/show_bug.cgi?id=3D201753 --- Comment #33 from David Coe (david.coe@live.co.uk) --- Good evening all! Herewith a summary of our various results, including my latest for the Ryze= n 7 4700U (Acer Swift 3). 20 msec wait with logged retrys Ryzen Kernel Cold Warm 4700U 5.11.0-11 6 1 3500U 5.11.7 5 6 2500U 5.8.0-45 5 5.12.0 RC3 5 > 5 2400G 5.11.0-11 6 6 5.8.0-45 5 6 2200G ? >10 Two points are clear: 1. there are differences between cold and warm boot, mostly marginal but ma= rked and very consistent with my 4700U. 2. the choice of 5 as the maximum retry number is (sorry, Suravee) unfortun= ate. Mostly, it guarantees that all our Ryzens just fail the IOMMU write test! Paul's experiences with the 2200G are the exception and I can appreciate his unease about just increasing the number of retrys. I'm sure he, Suravee, Al= ex and the AMD engineers will find an elegant solution to the problem :-). In the meantime, could you formally patch-the-patch, Suravee? I'll pass on = the above data to Alex Hung, our "cherry-picker" at Ubuntu. Best regards David --=20 You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.=