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Tue, 3 Feb 2026 14:29:07 -0800 From: Daniel Jurgens To: , , , CC: , , , , , , , , , , , "Daniel Jurgens" Subject: [PATCH net-next v18 03/12] virtio: Expose generic device capability operations Date: Tue, 3 Feb 2026 16:28:50 -0600 Message-ID: <20260203222859.4219-4-danielj@nvidia.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20260203222859.4219-1-danielj@nvidia.com> References: <20260203222859.4219-1-danielj@nvidia.com> Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH1PEPF0000A34B:EE_|DS4PR12MB9586:EE_ X-MS-Office365-Filtering-Correlation-Id: 0056238a-24e5-4868-e718-08de6373b158 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|7416014|36860700013|376014; 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However, each device type has generic and device specific capabilities, that may be queried and set. In subsequent patches virtio_net will query and set flow filter capabilities. This changes the size of virtio_admin_cmd_query_cap_id_result. It's safe to do because this data is written by DMA, so a newer controller can't overrun the size on an older kernel. Signed-off-by: Daniel Jurgens Reviewed-by: Parav Pandit Reviewed-by: Xuan Zhuo --- v4: Moved this logic from virtio_pci_modern to new file virtio_admin_commands. v12: - Removed uapi virtio_pci include in virtio_admin.h. MST - Added virtio_pci uapi include to virtio_admin_commands.c - Put () around cap in macro. MST - Removed nonsense comment above VIRTIO_ADMIN_MAX_CAP. MST - +1 VIRTIO_ADMIN_MAX_CAP when calculating array size. MST - Updated commit message v13: - Include linux/slab.h MST - Check for overflow when adding inputs. MST v17: - Added missing includes. MST --- drivers/virtio/Makefile | 2 +- drivers/virtio/virtio_admin_commands.c | 96 ++++++++++++++++++++++++++ include/linux/virtio_admin.h | 80 +++++++++++++++++++++ include/uapi/linux/virtio_pci.h | 6 +- 4 files changed, 181 insertions(+), 3 deletions(-) create mode 100644 drivers/virtio/virtio_admin_commands.c create mode 100644 include/linux/virtio_admin.h diff --git a/drivers/virtio/Makefile b/drivers/virtio/Makefile index eefcfe90d6b8..2b4a204dde33 100644 --- a/drivers/virtio/Makefile +++ b/drivers/virtio/Makefile @@ -1,5 +1,5 @@ # SPDX-License-Identifier: GPL-2.0 -obj-$(CONFIG_VIRTIO) += virtio.o virtio_ring.o +obj-$(CONFIG_VIRTIO) += virtio.o virtio_ring.o virtio_admin_commands.o obj-$(CONFIG_VIRTIO_ANCHOR) += virtio_anchor.o obj-$(CONFIG_VIRTIO_PCI_LIB) += virtio_pci_modern_dev.o obj-$(CONFIG_VIRTIO_PCI_LIB_LEGACY) += virtio_pci_legacy_dev.o diff --git a/drivers/virtio/virtio_admin_commands.c b/drivers/virtio/virtio_admin_commands.c new file mode 100644 index 000000000000..be9144b25d84 --- /dev/null +++ b/drivers/virtio/virtio_admin_commands.c @@ -0,0 +1,96 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include +#include +#include +#include +#include +#include +#include + +int virtio_admin_cap_id_list_query(struct virtio_device *vdev, + struct virtio_admin_cmd_query_cap_id_result *data) +{ + struct virtio_admin_cmd cmd = {}; + struct scatterlist result_sg; + + if (!vdev->config->admin_cmd_exec) + return -EOPNOTSUPP; + + sg_init_one(&result_sg, data, sizeof(*data)); + cmd.opcode = cpu_to_le16(VIRTIO_ADMIN_CMD_CAP_ID_LIST_QUERY); + cmd.group_type = cpu_to_le16(VIRTIO_ADMIN_GROUP_TYPE_SELF); + cmd.result_sg = &result_sg; + + return vdev->config->admin_cmd_exec(vdev, &cmd); +} +EXPORT_SYMBOL_GPL(virtio_admin_cap_id_list_query); + +int virtio_admin_cap_get(struct virtio_device *vdev, + u16 id, + void *caps, + size_t cap_size) +{ + struct virtio_admin_cmd_cap_get_data *data; + struct virtio_admin_cmd cmd = {}; + struct scatterlist result_sg; + struct scatterlist data_sg; + int err; + + if (!vdev->config->admin_cmd_exec) + return -EOPNOTSUPP; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->id = cpu_to_le16(id); + sg_init_one(&data_sg, data, sizeof(*data)); + sg_init_one(&result_sg, caps, cap_size); + cmd.opcode = cpu_to_le16(VIRTIO_ADMIN_CMD_DEVICE_CAP_GET); + cmd.group_type = cpu_to_le16(VIRTIO_ADMIN_GROUP_TYPE_SELF); + cmd.data_sg = &data_sg; + cmd.result_sg = &result_sg; + + err = vdev->config->admin_cmd_exec(vdev, &cmd); + kfree(data); + + return err; +} +EXPORT_SYMBOL_GPL(virtio_admin_cap_get); + +int virtio_admin_cap_set(struct virtio_device *vdev, + u16 id, + const void *caps, + size_t cap_size) +{ + struct virtio_admin_cmd_cap_set_data *data; + struct virtio_admin_cmd cmd = {}; + struct scatterlist data_sg; + size_t data_size; + int err; + + if (!vdev->config->admin_cmd_exec) + return -EOPNOTSUPP; + + if (check_add_overflow(sizeof(*data), cap_size, &data_size)) + return -EOVERFLOW; + + data = kzalloc(data_size, GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->id = cpu_to_le16(id); + memcpy(data->cap_specific_data, caps, cap_size); + sg_init_one(&data_sg, data, data_size); + cmd.opcode = cpu_to_le16(VIRTIO_ADMIN_CMD_DRIVER_CAP_SET); + cmd.group_type = cpu_to_le16(VIRTIO_ADMIN_GROUP_TYPE_SELF); + cmd.data_sg = &data_sg; + cmd.result_sg = NULL; + + err = vdev->config->admin_cmd_exec(vdev, &cmd); + kfree(data); + + return err; +} +EXPORT_SYMBOL_GPL(virtio_admin_cap_set); diff --git a/include/linux/virtio_admin.h b/include/linux/virtio_admin.h new file mode 100644 index 000000000000..4ab84d53c924 --- /dev/null +++ b/include/linux/virtio_admin.h @@ -0,0 +1,80 @@ +/* SPDX-License-Identifier: GPL-2.0-only + * + * Header file for virtio admin operations + */ + +#ifndef _LINUX_VIRTIO_ADMIN_H +#define _LINUX_VIRTIO_ADMIN_H + +struct virtio_device; +struct virtio_admin_cmd_query_cap_id_result; + +/** + * VIRTIO_CAP_IN_LIST - Check if a capability is supported in the capability list + * @cap_list: Pointer to capability list structure containing supported_caps array + * @cap: Capability ID to check + * + * The cap_list contains a supported_caps array of little-endian 64-bit integers + * where each bit represents a capability. Bit 0 of the first element represents + * capability ID 0, bit 1 represents capability ID 1, and so on. + * + * Return: 1 if capability is supported, 0 otherwise + */ +#define VIRTIO_CAP_IN_LIST(cap_list, cap) \ + (!!(1 & (le64_to_cpu(cap_list->supported_caps[(cap) / 64]) >> (cap) % 64))) + +/** + * virtio_admin_cap_id_list_query - Query the list of available capability IDs + * @vdev: The virtio device to query + * @data: Pointer to result structure (must be heap allocated) + * + * This function queries the virtio device for the list of available capability + * IDs that can be used with virtio_admin_cap_get() and virtio_admin_cap_set(). + * The result is stored in the provided data structure. + * + * Return: 0 on success, -EOPNOTSUPP if the device doesn't support admin + * operations or capability queries, or a negative error code on other failures. + */ +int virtio_admin_cap_id_list_query(struct virtio_device *vdev, + struct virtio_admin_cmd_query_cap_id_result *data); + +/** + * virtio_admin_cap_get - Get capability data for a specific capability ID + * @vdev: The virtio device + * @id: Capability ID to retrieve + * @caps: Pointer to capability data structure (must be heap allocated) + * @cap_size: Size of the capability data structure + * + * This function retrieves a specific capability from the virtio device. + * The capability data is stored in the provided buffer. The caller must + * ensure the buffer is large enough to hold the capability data. + * + * Return: 0 on success, -EOPNOTSUPP if the device doesn't support admin + * operations or capability retrieval, or a negative error code on other failures. + */ +int virtio_admin_cap_get(struct virtio_device *vdev, + u16 id, + void *caps, + size_t cap_size); + +/** + * virtio_admin_cap_set - Set capability data for a specific capability ID + * @vdev: The virtio device + * @id: Capability ID to set + * @caps: Pointer to capability data structure (must be heap allocated) + * @cap_size: Size of the capability data structure + * + * This function sets a specific capability on the virtio device. + * The capability data is read from the provided buffer and applied + * to the device. The device may validate the capability data before + * applying it. + * + * Return: 0 on success, -EOPNOTSUPP if the device doesn't support admin + * operations or capability setting, or a negative error code on other failures. + */ +int virtio_admin_cap_set(struct virtio_device *vdev, + u16 id, + const void *caps, + size_t cap_size); + +#endif /* _LINUX_VIRTIO_ADMIN_H */ diff --git a/include/uapi/linux/virtio_pci.h b/include/uapi/linux/virtio_pci.h index e732e3456e27..96d097d3757e 100644 --- a/include/uapi/linux/virtio_pci.h +++ b/include/uapi/linux/virtio_pci.h @@ -315,15 +315,17 @@ struct virtio_admin_cmd_notify_info_result { #define VIRTIO_DEV_PARTS_CAP 0x0000 +#define VIRTIO_ADMIN_MAX_CAP 0x0fff + struct virtio_dev_parts_cap { __u8 get_parts_resource_objects_limit; __u8 set_parts_resource_objects_limit; }; -#define MAX_CAP_ID __KERNEL_DIV_ROUND_UP(VIRTIO_DEV_PARTS_CAP + 1, 64) +#define VIRTIO_ADMIN_CAP_ID_ARRAY_SIZE __KERNEL_DIV_ROUND_UP(VIRTIO_ADMIN_MAX_CAP + 1, 64) struct virtio_admin_cmd_query_cap_id_result { - __le64 supported_caps[MAX_CAP_ID]; + __le64 supported_caps[VIRTIO_ADMIN_CAP_ID_ARRAY_SIZE]; }; struct virtio_admin_cmd_cap_get_data { -- 2.50.1