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Wed, 19 Jun 2024 13:12:50 -0700 From: Nicolin Chen To: , , , , , CC: , , Subject: [PATCH v4] hw/arm/virt-acpi-build: Fix id_count in build_iort_id_mapping Date: Wed, 19 Jun 2024 13:12:43 -0700 Message-ID: <20240619201243.936819-1-nicolinc@nvidia.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MWH0EPF000989EB:EE_|PH7PR12MB9128:EE_ X-MS-Office365-Filtering-Correlation-Id: dc4f1075-e56c-40a8-6aed-08dc909c38b1 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230037|376011|36860700010|82310400023|1800799021; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.161; CTRY:US; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:mail.nvidia.com; PTR:dc6edge2.nvidia.com; CAT:NONE; SFS:(13230037)(376011)(36860700010)(82310400023)(1800799021); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Jun 2024 20:13:01.9279 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: dc4f1075-e56c-40a8-6aed-08dc909c38b1 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[216.228.117.161]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: MWH0EPF000989EB.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB9128 Received-SPF: softfail client-ip=2a01:111:f400:7ea9::610; envelope-from=nicolinc@nvidia.com; helo=NAM02-SN1-obe.outbound.protection.outlook.com X-Spam_score_int: -22 X-Spam_score: -2.3 X-Spam_bar: -- X-Spam_report: (-2.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.144, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org It's observed that Linux kernel booting with the VM reports a "conflicting mapping for input ID" FW_BUG. The IORT doc defines "Number of IDs" to be "the number of IDs in the range minus one", while virt-acpi-build.c simply stores the number of IDs in the id_count without the "minus one". Meanwhile, some of the callers pass in a 0xFFFF following the spec. So, this is a mismatch between the function and its callers. Fix build_iort_id_mapping() by internally subtracting one from the pass-in @id_count. Accordingly make sure that all existing callers pass in a value without the "minus one", i.e. change all 0xFFFFs to 0x10000s. Also, add a few lines of comments to highlight this change along with the referencing document for this build_iort_id_mapping(). Fixes: 42e0f050e3a5 ("hw/arm/virt-acpi-build: Add IORT support to bypass SMMUv3") Suggested-by: Michael S. Tsirkin Reviewed-by: Eric Auger Signed-off-by: Nicolin Chen --- Changelog v4: * Rephrased the function documentation and used the latest IORT spec ver. * Added "Reviewed-by" from Eric v3: https://lore.kernel.org/all/20240618211110.922809-1-nicolinc@nvidia.com/ * Added "-1" internally in build_iort_id_mapping() instead * Added comments to highlight this and referencing doc v2: https://lore.kernel.org/all/20240617223945.906996-1-nicolinc@nvidia.com/ * Moved "-1" to the same line of id_count calculation * Added "+1" to the next_range.input_base calculation v1: https://lore.kernel.org/all/20240613234802.828265-1-nicolinc@nvidia.com/ hw/arm/virt-acpi-build.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c index c3ccfef026..60a79b91ca 100644 --- a/hw/arm/virt-acpi-build.c +++ b/hw/arm/virt-acpi-build.c @@ -209,12 +209,19 @@ static void acpi_dsdt_add_tpm(Aml *scope, VirtMachineState *vms) #define ROOT_COMPLEX_ENTRY_SIZE 36 #define IORT_NODE_OFFSET 48 +/* + * Append an ID mapping entry as described by "Table 4 ID mapping format" in + * "IO Remapping Table System Software on ARM Platforms", Chapter 3. + * Document number: ARM DEN 0049E.f, Apr 2024 + * + * Note that @id_count gets internally subtracted by one, following the spec. + */ static void build_iort_id_mapping(GArray *table_data, uint32_t input_base, uint32_t id_count, uint32_t out_ref) { - /* Table 4 ID mapping format */ build_append_int_noprefix(table_data, input_base, 4); /* Input base */ - build_append_int_noprefix(table_data, id_count, 4); /* Number of IDs */ + /* Number of IDs - The number of IDs in the range minus one */ + build_append_int_noprefix(table_data, id_count - 1, 4); build_append_int_noprefix(table_data, input_base, 4); /* Output base */ build_append_int_noprefix(table_data, out_ref, 4); /* Output Reference */ /* Flags */ @@ -306,8 +313,8 @@ build_iort(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms) } /* Append the last RC -> ITS ID mapping */ - if (next_range.input_base < 0xFFFF) { - next_range.id_count = 0xFFFF - next_range.input_base; + if (next_range.input_base < 0x10000) { + next_range.id_count = 0x10000 - next_range.input_base; g_array_append_val(its_idmaps, next_range); } @@ -366,7 +373,7 @@ build_iort(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms) build_append_int_noprefix(table_data, 0, 4); /* output IORT node is the ITS group node (the first node) */ - build_iort_id_mapping(table_data, 0, 0xFFFF, IORT_NODE_OFFSET); + build_iort_id_mapping(table_data, 0, 0x10000, IORT_NODE_OFFSET); } /* Table 17 Root Complex Node */ @@ -419,7 +426,7 @@ build_iort(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms) } } else { /* output IORT node is the ITS group node (the first node) */ - build_iort_id_mapping(table_data, 0, 0xFFFF, IORT_NODE_OFFSET); + build_iort_id_mapping(table_data, 0, 0x10000, IORT_NODE_OFFSET); } acpi_table_end(linker, &table);