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 lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 70176CD11C2 for ; Thu, 11 Apr 2024 02:41:56 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.703733.1099572 (Exim 4.92) (envelope-from ) id 1rukNW-0001SK-JM; Thu, 11 Apr 2024 02:41:30 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 703733.1099572; Thu, 11 Apr 2024 02:41:30 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1rukNW-0001SD-Gg; Thu, 11 Apr 2024 02:41:30 +0000 Received: by outflank-mailman (input) for mailman id 703733; Thu, 11 Apr 2024 02:41:28 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1rukNU-0001S7-Sv for xen-devel@lists.xenproject.org; Thu, 11 Apr 2024 02:41:28 +0000 Received: from mailhost.m5p.com (mailhost.m5p.com [74.104.188.4]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id fd285128-f7ac-11ee-b908-491648fe20b8; Thu, 11 Apr 2024 04:41:26 +0200 (CEST) Received: from m5p.com (mailhost.m5p.com [IPv6:2001:470:8ac4:0:0:0:0:f7]) by mailhost.m5p.com (8.17.1/8.17.1) with ESMTPS id 43B2fBX3064891 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO); Wed, 10 Apr 2024 22:41:16 -0400 (EDT) (envelope-from ehem@m5p.com) Received: (from ehem@localhost) by m5p.com (8.17.1/8.15.2/Submit) id 43B2f91A064890; Wed, 10 Apr 2024 19:41:09 -0700 (PDT) (envelope-from ehem) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: fd285128-f7ac-11ee-b908-491648fe20b8 Date: Wed, 10 Apr 2024 19:41:09 -0700 From: Elliott Mitchell To: Jan Beulich Cc: xen-devel@lists.xenproject.org, Andrew Cooper , Roger Pau =?iso-8859-1?Q?Monn=E9?= , Wei Liu , Kelly Choi Subject: Re: Serious AMD-Vi(?) issue Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Thu, Mar 28, 2024 at 07:25:02AM +0100, Jan Beulich wrote: > On 27.03.2024 18:27, Elliott Mitchell wrote: > > On Mon, Mar 25, 2024 at 02:43:44PM -0700, Elliott Mitchell wrote: > >> On Mon, Mar 25, 2024 at 08:55:56AM +0100, Jan Beulich wrote: > >>> > >>> In fact when running into trouble, the usual course of action would be to > >>> increase verbosity in both hypervisor and kernel, just to make sure no > >>> potentially relevant message is missed. > >> > >> More/better information might have been obtained if I'd been engaged > >> earlier. > > > > This is still true, things are in full mitigation mode and I'll be > > quite unhappy to go back with experiments at this point. > > Well, it very likely won't work without further experimenting by someone > able to observe the bad behavior. Recall we're on xen-devel here; it is > kind of expected that without clear (and practical) repro instructions > experimenting as well as info collection will remain with the reporter. After looking at the situation and considering the issues, I /may/ be able to setup for doing more testing. I guess I should confirm, which of those criteria do you think currently provided information fails at? AMD-IOMMU + Linux MD RAID1 + dual Samsung SATA (or various NVMe) + dbench; seems a pretty specific setup. I could see this being criticised as impractical if /new/ devices were required, but the confirmed flash devices are several generations old. Difficulty is cheaper candidate devices are being recycled for their precious metal content, rather than resold as used. -- (\___(\___(\______ --=> 8-) EHM <=-- ______/)___/)___/) \BS ( | ehem+sigmsg@m5p.com PGP 87145445 | ) / \_CS\ | _____ -O #include O- _____ | / _/ 8A19\___\_|_/58D2 7E3D DDF4 7BA6 <-PGP-> 41D1 B375 37D0 8714\_|_/___/5445