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GET /api/1.0/patches/2219344/?format=api
{ "id": 2219344, "url": "http://patchwork.ozlabs.org/api/1.0/patches/2219344/?format=api", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/1.0/projects/14/?format=api", "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": "" }, "msgid": "<20260402215629.745866-22-ruslichenko.r@gmail.com>", "date": "2026-04-02T21:56:06", "name": "[v3,21/33] hw/arm/arm_generic_fdt: Add support for host-backed RAM regions", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "756c7b046e2e03a99a0ddc01f42f1f6649482157", "submitter": { "id": 92275, "url": "http://patchwork.ozlabs.org/api/1.0/people/92275/?format=api", "name": "Ruslan Ruslichenko", "email": "ruslichenko.r@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260402215629.745866-22-ruslichenko.r@gmail.com/mbox/", "series": [ { "id": 498555, "url": "http://patchwork.ozlabs.org/api/1.0/series/498555/?format=api", "date": "2026-04-02T21:55:47", "name": "hw/arm: Introduce generic FDT-driven machine", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/498555/mbox/" } ], "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2219344/checks/", "tags": {}, "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=N3lcUhX3;\n\tdkim-atps=neutral", "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 4fmwj80yrTz1yD3\n\tfor <incoming@patchwork.ozlabs.org>; Fri, 03 Apr 2026 08:58:36 +1100 (AEDT)", "from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from <qemu-devel-bounces@nongnu.org>)\n\tid 1w8Q2k-0000GD-K0; Thu, 02 Apr 2026 17:57:39 -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 <ruslichenko.r@gmail.com>)\n id 1w8Q2W-00005L-Pe\n for qemu-devel@nongnu.org; Thu, 02 Apr 2026 17:57:25 -0400", "from mail-ej1-x62b.google.com ([2a00:1450:4864:20::62b])\n by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128)\n (Exim 4.90_1) (envelope-from <ruslichenko.r@gmail.com>)\n id 1w8Q2T-0007CW-VD\n for qemu-devel@nongnu.org; Thu, 02 Apr 2026 17:57:23 -0400", "by mail-ej1-x62b.google.com with SMTP id\n a640c23a62f3a-b7cf4a975d2so176158166b.2\n for <qemu-devel@nongnu.org>; Thu, 02 Apr 2026 14:57:21 -0700 (PDT)", "from thinkpad-t470s.. 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Iglesias\" <edgar.iglesias@gmail.com>,\n Ruslan_Ruslichenko@epam.com, balaton@eik.bme.hu", "Subject": "[PATCH v3 21/33] hw/arm/arm_generic_fdt: Add support for host-backed\n RAM regions", "Date": "Thu, 2 Apr 2026 23:56:06 +0200", "Message-ID": "<20260402215629.745866-22-ruslichenko.r@gmail.com>", "X-Mailer": "git-send-email 2.43.0", "In-Reply-To": "<20260402215629.745866-1-ruslichenko.r@gmail.com>", "References": "<20260402215629.745866-1-ruslichenko.r@gmail.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Received-SPF": "pass client-ip=2a00:1450:4864:20::62b;\n envelope-from=ruslichenko.r@gmail.com; helo=mail-ej1-x62b.google.com", "X-Spam_score_int": "-20", "X-Spam_score": "-2.1", "X-Spam_bar": "--", "X-Spam_report": "(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=unavailable 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 <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "From: Ruslan Ruslichenko <Ruslan_Ruslichenko@epam.com>\n\nAdd the ability to dynamically map QEMU host memory backends to\nguest memory using configuration from the Device Tree.\n\nTo map a host memory backend, memory region nodes with the\n'qemu-memory-region' compatible string and the 'qemu,ram' property\nmust specify a 'qemu,host-id' property containing the memdev name.\n\nThe corresponding memory backends can be specified via the command line:\n\n...\n-object memory-backend-file,id=mem0,mem-path=memory.img,size=256M\n...\n\nIf no host backend is found, the initialization will fall back to\nstandard anonymous memory mapping.\n\nSigned-off-by: Ruslan Ruslichenko <Ruslan_Ruslichenko@epam.com>\n---\n hw/arm/arm_generic_fdt.c | 96 +++++++++++++++++++++++++++++++++++++++-\n 1 file changed, 95 insertions(+), 1 deletion(-)", "diff": "diff --git a/hw/arm/arm_generic_fdt.c b/hw/arm/arm_generic_fdt.c\nindex 7b50957a82..de121820e0 100644\n--- a/hw/arm/arm_generic_fdt.c\n+++ b/hw/arm/arm_generic_fdt.c\n@@ -43,6 +43,98 @@ struct ARMGenericFDTState {\n \n OBJECT_DECLARE_SIMPLE_TYPE(ARMGenericFDTState, ARM_GENERIC_FDT_MACHINE)\n \n+static void map_host_memdev_node(FDTMachineInfo *fdti, const char *node_path)\n+{\n+ int len;\n+ uint64_t mr_size, backed_size;\n+ Object *mem_obj;\n+ Object *backend_obj;\n+ MemoryRegion *mr;\n+ MemoryRegion *backend_mr;\n+ MemoryRegion *container;\n+ HostMemoryBackend *backend_mem;\n+\n+ const char *compat = qemu_fdt_getprop(fdti->fdt, node_path,\n+ \"compatible\", &len, NULL);\n+ const char *host_id = qemu_fdt_getprop(fdti->fdt, node_path, \"qemu,host-id\",\n+ &len, NULL);\n+ bool is_qemu_ram = (qemu_fdt_getprop(fdti->fdt, node_path, \"qemu,ram\",\n+ &len, NULL) != NULL);\n+\n+ if (!compat || strcmp(compat, \"qemu-memory-region\")) {\n+ return;\n+ }\n+\n+ if (!is_qemu_ram || !host_id) {\n+ return;\n+ }\n+\n+ mem_obj = fdt_init_get_opaque(fdti, node_path);\n+ if (!mem_obj) {\n+ return;\n+ }\n+\n+ backend_obj = object_resolve_path_type(host_id, TYPE_MEMORY_BACKEND,\n+ NULL);\n+ if (!backend_obj) {\n+ warn_report(\"No mem backend found for FDT requested host-id %s\",\n+ host_id);\n+ return;\n+ }\n+\n+ backend_mem = MEMORY_BACKEND(backend_obj);\n+ backend_mr = host_memory_backend_get_memory(backend_mem);\n+\n+ mr = MEMORY_REGION(mem_obj);\n+ container = mr->container;\n+ if (!container) {\n+ warn_report(\"No parent found for requested host-id %s\",\n+ host_id);\n+ return;\n+ }\n+\n+ mr_size = memory_region_size(mr);\n+ backed_size = memory_region_size(backend_mr);\n+\n+ if (backed_size != mr_size) {\n+ error_report(\"Unable to map host backed memory: %s, \"\n+ \"dts size: 0x%\" PRIx64 \", but memdev size: 0x%\" PRIx64,\n+ host_id, mr_size, backed_size);\n+ exit(1);\n+ }\n+\n+ hwaddr base_addr = mr->addr;\n+\n+ memory_region_del_subregion(container, mr);\n+ memory_region_add_subregion(container, base_addr, backend_mr);\n+\n+ fdt_init_set_opaque(fdti, node_path, OBJECT(backend_mr));\n+ object_unparent(mem_obj);\n+}\n+\n+/* Parse device-tree starting from 'node' and attach file-backed RAM's */\n+static void map_host_memdevs(FDTMachineInfo *fdti, const char *node_path)\n+{\n+ int i;\n+ char **children;\n+ int num_children = qemu_devtree_get_num_children(fdti->fdt, node_path);\n+\n+ if (num_children > 0) {\n+ children = g_malloc0(sizeof(*children) * num_children);\n+\n+ num_children = qemu_devtree_get_children(fdti->fdt, node_path,\n+ num_children, children);\n+ for (i = 0; i < num_children; ++i) {\n+ map_host_memdevs(fdti, children[i]);\n+ g_free(children[i]);\n+ }\n+\n+ g_free(children);\n+ }\n+\n+ map_host_memdev_node(fdti, node_path);\n+}\n+\n static void init_machine(void *fdt, ARMGenericFDTState *s)\n {\n FDTMachineInfo *fdti;\n@@ -63,7 +155,9 @@ static void init_machine(void *fdt, ARMGenericFDTState *s)\n /* Instantiate peripherals from the FDT. */\n fdti = fdt_generic_create_machine(fdt, NULL);\n \n- mem_area = MEMORY_REGION(object_resolve_path(node_path[0], NULL));\n+ map_host_memdevs(fdti, \"/\");\n+\n+ mem_area = MEMORY_REGION(fdt_init_get_opaque(fdti, node_path[0]));\n \n s->bootinfo.loader_start = object_property_get_int(OBJECT(mem_area),\n \"addr\", NULL);\n", "prefixes": [ "v3", "21/33" ] }