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 B652B10A62C9 for ; Thu, 26 Mar 2026 13:04:40 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1w5kNs-0004w8-3d; Thu, 26 Mar 2026 09:04:24 -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 1w5kNq-0004vu-2r for qemu-devel@nongnu.org; Thu, 26 Mar 2026 09:04:22 -0400 Received: from frasgout.his.huawei.com ([185.176.79.56]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1w5kNl-0005ea-3O for qemu-devel@nongnu.org; Thu, 26 Mar 2026 09:04:21 -0400 Received: from mail.maildlp.com (unknown [172.18.224.150]) by frasgout.his.huawei.com (SkyGuard) with ESMTPS id 4fhP9465qdzHnGhq; Thu, 26 Mar 2026 21:03:36 +0800 (CST) Received: from dubpeml500005.china.huawei.com (unknown [7.214.145.207]) by mail.maildlp.com (Postfix) with ESMTPS id 33EC64056E; Thu, 26 Mar 2026 21:04:14 +0800 (CST) Received: from localhost (10.203.177.99) by dubpeml500005.china.huawei.com (7.214.145.207) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Thu, 26 Mar 2026 13:04:13 +0000 Date: Thu, 26 Mar 2026 13:04:09 +0000 To: Markus Armbruster CC: , , , , , , , , , , , , Subject: Re: [PATCH 1/9] hw/mem: Add tag support to generic host memory backends Message-ID: <20260326130409.0000405b.alireza.sanaee@huawei.com> In-Reply-To: <87bjgag2y5.fsf@pond.sub.org> References: <20260325184259.366-1-alireza.sanaee@huawei.com> <20260325184259.366-2-alireza.sanaee@huawei.com> <87a4vuhnxy.fsf@pond.sub.org> <20260326112921.000028e6.alireza.sanaee@huawei.com> <87bjgag2y5.fsf@pond.sub.org> Organization: Huawei 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: [10.203.177.99] X-ClientProxiedBy: lhrpeml100009.china.huawei.com (7.191.174.83) To dubpeml500005.china.huawei.com (7.214.145.207) Received-SPF: pass client-ip=185.176.79.56; envelope-from=alireza.sanaee@huawei.com; helo=frasgout.his.huawei.com X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, 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: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-to: Alireza Sanaee From: Alireza Sanaee via qemu development Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Thu, 26 Mar 2026 14:01:06 +0100 Markus Armbruster wrote: Hi Markus, Sure, absolutely. > Alireza Sanaee writes: > > > On Thu, 26 Mar 2026 11:42:17 +0100 > > Markus Armbruster wrote: > > > > Hi Markus, > > > >> Alireza Sanaee writes: > >> > >> > Add a string tag property to HostMemoryBackend so that backends can be > >> > identified by a user-assigned name at runtime. Expose the property through > >> > QOM and add a host_memory_backend_find_by_tag() helper that walks the > >> > object tree to locate a backend by its tag. > >> > >> Why can't you use the QOM ID? > >> > >> $ qemu-system-x86_64 -S -display none -monitor stdio -object memory-backend-ram,id=fred,size=1M > >> QEMU 10.2.90 monitor - type 'help' for more information > >> (qemu) info qom-tree /objects/fred > >> /fred (memory-backend-ram) > >> /fred[0] (memory-region) > >> > >> > > > > Fair question. The ID would have been a solution if it had accepted GUIDs. CXL spec > > requires GUIDs for extents as identification, hence new tag property. > > Your commit message should state that this needs to be a GUID and why. > > > alireza@blue-ocean:~/Downloads$ qemu-system-x86_64 -s -display none -monitor std > > io -object memory-backend-ram,id=02bb2436-e87d-4aa1-b2be-aaffdd76bb79,size=1M > > qemu-system-x86_64: -object memory-backend-ram,id=02bb2436-e87d-4aa1-b2be-aaffdd > > 76bb79,size=1M: Parameter 'id' expects an identifier > > Identifiers consist of letters, digits, '-', '.', '_', starting with a letter. > > > > Thanks, > > Ali > >