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 1974AF30955 for ; Thu, 5 Mar 2026 12:33:04 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vy7sJ-0004h4-MF; Thu, 05 Mar 2026 07:32:20 -0500 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 1vy7sH-0004gh-II for qemu-devel@nongnu.org; Thu, 05 Mar 2026 07:32:17 -0500 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 1vy7sE-0001yP-Sn for qemu-devel@nongnu.org; Thu, 05 Mar 2026 07:32:17 -0500 Received: from mail.maildlp.com (unknown [172.18.224.150]) by frasgout.his.huawei.com (SkyGuard) with ESMTPS id 4fRTRk6B4gzJ46mH; Thu, 5 Mar 2026 20:31:30 +0800 (CST) Received: from dubpeml500005.china.huawei.com (unknown [7.214.145.207]) by mail.maildlp.com (Postfix) with ESMTPS id 3701F4056A; Thu, 5 Mar 2026 20:32:07 +0800 (CST) Received: from localhost (10.203.177.15) 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, 5 Mar 2026 12:32:06 +0000 Date: Thu, 5 Mar 2026 12:32:05 +0000 To: fanhuang CC: , , , , , , , Subject: Re: [PATCH v6 0/1] numa: add 'memmap-type' option for memory type configuration Message-ID: <20260305123205.00006ac0@huawei.com> In-Reply-To: <20260226105023.256568-1-FangSheng.Huang@amd.com> References: <20260226105023.256568-1-FangSheng.Huang@amd.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: [10.203.177.15] X-ClientProxiedBy: lhrpeml100012.china.huawei.com (7.191.174.184) To dubpeml500005.china.huawei.com (7.214.145.207) Received-SPF: pass client-ip=185.176.79.56; envelope-from=jonathan.cameron@huawei.com; helo=frasgout.his.huawei.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.892, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.622, 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: Jonathan Cameron From: Jonathan Cameron 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 Feb 2026 18:50:22 +0800 fanhuang wrote: > Hi all, > > This is v6 of the SPM (Specific Purpose Memory) patch. Thank you for > the feedback on v5, especially Gregory's review. > > Changes in v6: > - Added validation: memmap-type now requires memdev to be specified, > to avoid misconfiguration on memory-less NUMA nodes > - Simplified pc_update_numa_memory_types() by replacing switch/goto > with a direct conditional expression > - Reserved memory nodes are now excluded from SRAT memory affinity > entries, since E820 already marks them as reserved and SRAT should > not report them as enabled memory affinity > > Use case: > This feature allows marking NUMA node memory as Specific Purpose Memory > (SPM) or reserved in the E820 table. SPM serves as a hint to the guest > that this memory might be managed by device drivers based on guest policy > > Example usage: > -object memory-backend-ram,size=8G,id=m0 > -object memory-backend-memfd,size=8G,id=m1 > -numa node,nodeid=0,memdev=m0 > -numa node,nodeid=1,memdev=m1,memmap-type=spm > > Supported memmap-type values: > - normal: Regular system RAM (E820 type 1, default) > - spm: Specific Purpose Memory (E820 type 0xEFFFFFFF), a hint > that this memory might be managed by device drivers > - reserved: Reserved memory (E820 type 2), not usable as RAM Interface looks good to me. I'm not familiar enough to confirm the x86 specific elements without more time than I have today though so no tags from me. Thanks for doing this! Jonathan