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h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=Z43cZeKSdhq3v6JXln/ykC0j1uv41JjKp5FJGFs3XtE=; b=5eigp3WEKqXsLgiw61C9MlZs66CGYjU0COs9Prsbt4bc+Qnc6X5SqldBZdXlvesuh738QvXWk6CpwydctSwr4epWUQvU5+IzLqVurq47JUCjK8vCRORo8JecN++waolmDsPCh6YY7a2dIVEnHdJNJdgHNe/Y1Usu4l8rWAKX0UA= X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C From: Michal Orzel To: CC: Michal Orzel , Stefano Stabellini , Julien Grall , Bertrand Marquis , Volodymyr Babchuk , Luca Fancellu Subject: [PATCH for-4.20 v2] xen/arm: bootfdt: Fix device tree memory node probing Date: Wed, 10 Jul 2024 13:22:04 +0200 Message-ID: <20240710112204.33542-1-michal.orzel@amd.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: None (SATLEXMB04.amd.com: michal.orzel@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN3PEPF0000B070:EE_|CH3PR12MB7692:EE_ X-MS-Office365-Filtering-Correlation-Id: a546f256-c261-4f3a-7b5f-08dca0d28a14 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|36860700013|376014; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Jul 2024 11:22:09.7442 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a546f256-c261-4f3a-7b5f-08dca0d28a14 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN3PEPF0000B070.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB7692 X-ZohoMail-DKIM: pass (identity @amd.com) X-ZM-MESSAGEID: 1720611028609116600 Content-Type: text/plain; charset="utf-8" Memory node probing is done as part of early_scan_node() that is called for each node with depth >=3D 1 (root node is at depth 0). According to Devicetree Specification v0.4, chapter 3.4, /memory node can only exists as a top level node. However, Xen incorrectly considers all the nodes with unit node name "memory" as RAM. This buggy behavior can result in a failure if there are other nodes in the device tree (at depth >=3D 2) with "memory" as unit node name. An example can be a "memory@xxx" node under /reserved-memory. Fix it by introducing device_tree_is_memory_node() to perform all the required checks to assess if a node is a proper /memory node. Fixes: 3e99c95ba1c8 ("arm, device tree: parse the DTB for RAM location and = size") Signed-off-by: Michal Orzel Reviewed-by: Luca Fancellu Tested-by: Luca Fancellu Reviewed-by: Julien Grall --- Changes in v2: - improve the length check --- xen/arch/arm/bootfdt.c | 28 +++++++++++++++++++++++++++- 1 file changed, 27 insertions(+), 1 deletion(-) diff --git a/xen/arch/arm/bootfdt.c b/xen/arch/arm/bootfdt.c index 6e060111d95b..f2892fce0a9c 100644 --- a/xen/arch/arm/bootfdt.c +++ b/xen/arch/arm/bootfdt.c @@ -83,6 +83,32 @@ static bool __init device_tree_node_compatible(const voi= d *fdt, int node, return false; } =20 +/* + * Check if a node is a proper /memory node according to Devicetree + * Specification v0.4, chapter 3.4. + */ +static bool __init device_tree_is_memory_node(const void *fdt, int node, + int depth) +{ + const char *type; + int len; + + if ( depth !=3D 1 ) + return false; + + if ( !device_tree_node_matches(fdt, node, "memory") ) + return false; + + type =3D fdt_getprop(fdt, node, "device_type", &len); + if ( !type ) + return false; + + if ( (len <=3D strlen("memory")) || strcmp(type, "memory") ) + return false; + + return true; +} + void __init device_tree_get_reg(const __be32 **cell, uint32_t address_cell= s, uint32_t size_cells, paddr_t *start, paddr_t *size) @@ -448,7 +474,7 @@ static int __init early_scan_node(const void *fdt, * populated. So we should skip the parsing. */ if ( !efi_enabled(EFI_BOOT) && - device_tree_node_matches(fdt, node, "memory") ) + device_tree_is_memory_node(fdt, node, depth) ) rc =3D process_memory_node(fdt, node, name, depth, address_cells, size_cells, bootinfo_get_m= em()); else if ( depth =3D=3D 1 && !dt_node_cmp(name, "reserved-memory") ) --=20 2.25.1