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.gnu.org (lists.gnu.org [209.51.188.17]) (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 420D5C71136 for ; Fri, 13 Jun 2025 17:18:16 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1uQ82N-0005iv-B3; Fri, 13 Jun 2025 13:17:55 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1uQ82F-0005co-1C; Fri, 13 Jun 2025 13:17:47 -0400 Received: from [185.176.79.56] (helo=frasgout.his.huawei.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1uQ82C-0002b0-7e; Fri, 13 Jun 2025 13:17:46 -0400 Received: from mail.maildlp.com (unknown [172.18.186.31]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4bJmKf5XBnz6M4sr; Sat, 14 Jun 2025 01:17:10 +0800 (CST) Received: from frapeml500008.china.huawei.com (unknown [7.182.85.71]) by mail.maildlp.com (Postfix) with ESMTPS id 439BC140277; Sat, 14 Jun 2025 01:17:38 +0800 (CST) Received: from localhost (10.122.19.247) by frapeml500008.china.huawei.com (7.182.85.71) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Fri, 13 Jun 2025 19:17:37 +0200 Date: Fri, 13 Jun 2025 18:17:36 +0100 To: Peter Maydell CC: , Fan Ni , , Zhijian Li , Itaru Kitayama , , , , Yuquan Wang , Philippe =?ISO-8859-1?Q?Mathieu-Daud=E9?= , Alireza Sanaee , Alex =?ISO-8859-1?Q?Benn=E9e?= Subject: Re: [PATCH v15 2/4] hw/cxl: Make the CXL fixed memory windows devices. Message-ID: <20250613181736.000063e5@huawei.com> In-Reply-To: References: <20250612134338.1871023-1-Jonathan.Cameron@huawei.com> <20250612134338.1871023-3-Jonathan.Cameron@huawei.com> <20250613140954.000013f5@huawei.com> X-Mailer: Claws Mail 4.3.0 (GTK 3.24.42; x86_64-w64-mingw32) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.122.19.247] X-ClientProxiedBy: lhrpeml100006.china.huawei.com (7.191.160.224) To frapeml500008.china.huawei.com (7.182.85.71) X-Host-Lookup-Failed: Reverse DNS lookup failed for 185.176.79.56 (deferred) Received-SPF: pass client-ip=185.176.79.56; envelope-from=jonathan.cameron@huawei.com; helo=frasgout.his.huawei.com X-Spam_score_int: -33 X-Spam_score: -3.4 X-Spam_bar: --- X-Spam_report: (-3.4 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-to: Jonathan Cameron From: Jonathan Cameron via Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Fri, 13 Jun 2025 17:08:28 +0100 Peter Maydell wrote: > On Fri, 13 Jun 2025 at 14:10, Jonathan Cameron > wrote: > > For these specific devices (the fixed memory windows) there isn't > > any state as they are representing fixed configuration of the system. > > The state is all in the host bridges and beyond. I'll add > > a comment as you suggest. > > > > Currently CXL emulation is completely broken wrt to migration and > > there are some known issues for reset as well. Both are on the list > > of things to fix. Migration is less important as the only current use > > for this stuff is running software stack test cases and for that > > migration isn't currently of interest - that will change for some > > of the virtualization related work that is just getting started. > > That's OK as long as something somewhere is registering a > migration-blocker so there's a useful error message if the > user ever tries it. :( Michael asked for us to fix that a while back and I forgot. Will sort that out shortly. J > > -- PMM