{"id":2216054,"url":"http://patchwork.ozlabs.org/api/patches/2216054/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260325184259.366-9-alireza.sanaee@huawei.com/","project":{"id":14,"url":"http://patchwork.ozlabs.org/api/projects/14/?format=json","name":"QEMU Development","link_name":"qemu-devel","list_id":"qemu-devel.nongnu.org","list_email":"qemu-devel@nongnu.org","web_url":"","scm_url":"","webscm_url":"","list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260325184259.366-9-alireza.sanaee@huawei.com>","list_archive_url":null,"date":"2026-03-25T18:42:56","name":"[8/9] hw/cxl: Add tag-based dynamic-capacity release support","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"9ec9b380b89b35dbe3c7a64c5a2483454604e412","submitter":{"id":90159,"url":"http://patchwork.ozlabs.org/api/people/90159/?format=json","name":"Alireza Sanaee","email":"alireza.sanaee@huawei.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260325184259.366-9-alireza.sanaee@huawei.com/mbox/","series":[{"id":497484,"url":"http://patchwork.ozlabs.org/api/series/497484/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/list/?series=497484","date":"2026-03-25T18:42:48","name":"Application Specific Tagged Memory Support in CXL Type 3 Devices","version":1,"mbox":"http://patchwork.ozlabs.org/series/497484/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2216054/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2216054/checks/","tags":{},"related":[],"headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":"legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)","Received":["from lists.gnu.org (lists.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fgws52vzWz1xy3\n\tfor ; Thu, 26 Mar 2026 05:48:09 +1100 (AEDT)","from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from )\n\tid 1w5TGV-0005lj-TL; Wed, 25 Mar 2026 14:47:39 -0400","from eggs.gnu.org ([2001:470:142:3::10])\n by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from )\n id 1w5TGR-0005kC-Ht\n for qemu-devel@nongnu.org; Wed, 25 Mar 2026 14:47:36 -0400","from frasgout.his.huawei.com ([185.176.79.56])\n by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from )\n id 1w5TGP-0000Ec-Ro\n for qemu-devel@nongnu.org; Wed, 25 Mar 2026 14:47:35 -0400","from mail.maildlp.com (unknown [172.18.224.83])\n by frasgout.his.huawei.com (SkyGuard) with ESMTPS id 4fgwrC0wMtzJ46DS;\n Thu, 26 Mar 2026 02:47:23 +0800 (CST)","from dubpeml500005.china.huawei.com (unknown [7.214.145.207])\n by mail.maildlp.com (Postfix) with ESMTPS id 16DA640086;\n Thu, 26 Mar 2026 02:47:32 +0800 (CST)","from a2303103017.china.huawei.com (10.47.66.203) by\n dubpeml500005.china.huawei.com (7.214.145.207) with Microsoft SMTP Server\n (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id\n 15.2.1544.11; Wed, 25 Mar 2026 18:47:30 +0000"],"To":"","CC":", , ,\n , ,\n , , ,\n , , ,\n , ","Subject":"[PATCH 8/9] hw/cxl: Add tag-based dynamic-capacity release support","Date":"Wed, 25 Mar 2026 18:42:56 +0000","Message-ID":"<20260325184259.366-9-alireza.sanaee@huawei.com>","X-Mailer":"git-send-email 2.51.0.windows.2","In-Reply-To":"<20260325184259.366-1-alireza.sanaee@huawei.com>","References":"<20260325184259.366-1-alireza.sanaee@huawei.com>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","Content-Type":"text/plain","X-Originating-IP":"[10.47.66.203]","X-ClientProxiedBy":"lhrpeml500011.china.huawei.com (7.191.174.215) To\n dubpeml500005.china.huawei.com (7.214.145.207)","Received-SPF":"pass client-ip=185.176.79.56;\n 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,\n RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001,\n 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":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Reply-to":"Alireza Sanaee ","From":"Alireza Sanaee via qemu development ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"},"content":"Add support for the tag-based dynamic-capacity release policy via the QMP\ninterface. The new path scans committed extents, selects those whose stored\ntag matches the requested UUID, and emits a Release Dynamic Capacity event\nfor each matching range.\n\nThis is intentionally scoped to tag-driven selection. Prescriptive release\nhandling and the underlying extent teardown stay in the existing paths.\n\nSigned-off-by: Alireza Sanaee \n---\n hw/mem/cxl_type3.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++\n 1 file changed, 61 insertions(+)","diff":"diff --git a/hw/mem/cxl_type3.c b/hw/mem/cxl_type3.c\nindex 6b73d58358..d5fa8a530a 100644\n--- a/hw/mem/cxl_type3.c\n+++ b/hw/mem/cxl_type3.c\n@@ -2492,6 +2492,63 @@ static void qmp_cxl_process_dynamic_capacity_prescriptive(const char *path,\n cxl_create_dc_event_records_for_extents(dcd, type, extents, num_extents);\n }\n \n+static void qmp_cxl_process_dynamic_capacity_tag_based(const char *path,\n+ uint16_t hid, CXLDCEventType type, uint8_t rid, const char *tag,\n+ CxlDynamicCapacityExtentList *records, Error **errp)\n+{\n+ Object *obj;\n+ CXLType3Dev *dcd;\n+ CXLDCExtentList *list = NULL;\n+ CXLDCExtent *ent;\n+ g_autofree CXLDCExtentRaw *extents = NULL;\n+\n+ obj = object_resolve_path_type(path, TYPE_CXL_TYPE3, NULL);\n+ if (!obj) {\n+ error_setg(errp, \"Unable to resolve CXL type 3 device\");\n+ return;\n+ }\n+\n+ dcd = CXL_TYPE3(obj);\n+ if (!dcd->dc.num_regions) {\n+ error_setg(errp, \"No dynamic capacity support from the device\");\n+ return;\n+ }\n+\n+ if (rid >= dcd->dc.num_regions) {\n+ error_setg(errp, \"region id is too large\");\n+ return;\n+ }\n+\n+ QemuUUID uuid_req;\n+ qemu_uuid_parse(tag, &uuid_req);\n+\n+ list = &dcd->dc.extents;\n+ size_t cap = 8, n = 0;\n+ extents = g_new0(CXLDCExtentRaw, cap);\n+ QTAILQ_FOREACH(ent, list, node) {\n+ QemuUUID uuid_ext;\n+ memcpy(&uuid_ext.data, ent->tag, sizeof(ent->tag));\n+ if (!qemu_uuid_is_equal(&uuid_req, &uuid_ext)) {\n+ continue;\n+ }\n+\n+ if (n == cap) {\n+ cap *= 2;\n+ extents = g_renew(CXLDCExtentRaw, extents, cap);\n+ }\n+\n+ extents[n++] = (CXLDCExtentRaw){ .start_dpa = ent->start_dpa,\n+ .len = ent->len,\n+ .shared_seq = 0 };\n+ }\n+\n+ if (n == 0) {\n+ return;\n+ }\n+ extents = g_renew(CXLDCExtentRaw, extents, n);\n+ cxl_create_dc_event_records_for_extents(dcd, type, extents, n);\n+}\n+\n void qmp_cxl_add_dynamic_capacity(const char *path, uint16_t host_id,\n CxlExtentSelectionPolicy sel_policy,\n uint8_t region, const char *tag,\n@@ -2537,6 +2594,10 @@ void qmp_cxl_release_dynamic_capacity(const char *path, uint16_t host_id,\n region, tag,\n extents, errp);\n return;\n+ case CXL_EXTENT_REMOVAL_POLICY_TAG_BASED:\n+ qmp_cxl_process_dynamic_capacity_tag_based(path, host_id, type, region,\n+ tag, extents, errp);\n+ return;\n default:\n error_setg(errp, \"Removal policy not supported\");\n return;\n","prefixes":["8/9"]}