[PATCH V7 vfio 4/9] virtio-pci: Introduce admin commands

Yishai Hadas
2023-12-07T10:29:28Z

From: Feng Liu <feliu@nvidia.com>

Introduces admin commands, as follow:

The "list query" command can be used by the driver to query the
set of admin commands supported by the virtio device.
The "list use" command is used to inform the virtio device which
admin commands the driver will use.
The "legacy common cfg rd/wr" commands are used to read from/write
into the legacy common configuration structure.
The "legacy dev cfg rd/wr" commands are used to read from/write
into the legacy device configuration structure.
The "notify info" command is used to query the notification region
information.

Signed-off-by: Feng Liu <feliu@nvidia.com>
Reviewed-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
---
include/uapi/linux/virtio_pci.h | 41 +++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)

diff --git a/include/uapi/linux/virtio_pci.h b/include/uapi/linux/virtio_pci.h
index 187fd9e34a30..ef3810dee7ef 100644
--- a/include/uapi/linux/virtio_pci.h
+++ b/include/uapi/linux/virtio_pci.h
@@ -226,6 +226,20 @@ struct virtio_pci_cfg_cap {
/* Admin command status. */
#define VIRTIO_ADMIN_STATUS_OK 0

+/* Admin command opcode. */
+#define VIRTIO_ADMIN_CMD_LIST_QUERY 0x0
+#define VIRTIO_ADMIN_CMD_LIST_USE 0x1
+
+/* Admin command group type. */
+#define VIRTIO_ADMIN_GROUP_TYPE_SRIOV 0x1
+
+/* Transitional device admin command. */
+#define VIRTIO_ADMIN_CMD_LEGACY_COMMON_CFG_WRITE 0x2
+#define VIRTIO_ADMIN_CMD_LEGACY_COMMON_CFG_READ 0x3
+#define VIRTIO_ADMIN_CMD_LEGACY_DEV_CFG_WRITE 0x4
+#define VIRTIO_ADMIN_CMD_LEGACY_DEV_CFG_READ 0x5
+#define VIRTIO_ADMIN_CMD_LEGACY_NOTIFY_INFO 0x6
+
struct __packed virtio_admin_cmd_hdr {
__le16 opcode;
/*
@@ -245,4 +259,31 @@ struct __packed virtio_admin_cmd_status {
__u8 reserved2[4];
};

+struct __packed virtio_admin_cmd_legacy_wr_data {
+ __u8 offset; /* Starting offset of the register(s) to write. */
+ __u8 reserved[7];
+ __u8 registers[];
+};
+
+struct __packed virtio_admin_cmd_legacy_rd_data {
+ __u8 offset; /* Starting offset of the register(s) to read. */
+};
+
+#define VIRTIO_ADMIN_CMD_NOTIFY_INFO_FLAGS_END 0
+#define VIRTIO_ADMIN_CMD_NOTIFY_INFO_FLAGS_OWNER_DEV 0x1
+#define VIRTIO_ADMIN_CMD_NOTIFY_INFO_FLAGS_OWNER_MEM 0x2
+
+#define VIRTIO_ADMIN_CMD_MAX_NOTIFY_INFO 4
+
+struct __packed virtio_admin_cmd_notify_info_data {
+ __u8 flags; /* 0 = end of list, 1 = owner device, 2 = member device */
+ __u8 bar; /* BAR of the member or the owner device */
+ __u8 padding[6];
+ __le64 offset; /* Offset within bar. */
+};
+
+struct virtio_admin_cmd_notify_info_result {
+ struct virtio_admin_cmd_notify_info_data entries[VIRTIO_ADMIN_CMD_MAX_NOTIFY_INFO];
+};
+
#endif
--
2.27.0