1 files changed, 102 insertions, 0 deletions

diff --git a/arch/um/drivers/vhost_user.h b/arch/um/drivers/vhost_user.h
new file mode 100644
index 000000000000..2a9829b0782b
--- /dev/null
+++ b/arch/um/drivers/vhost_user.h
@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Vhost-user protocol */
+
+#ifndef __VHOST_USER_H__
+#define __VHOST_USER_H__
+
+/* Message flags */
+#define VHOST_USER_FLAG_REPLY           BIT(2)
+/* Feature bits */
+#define VHOST_USER_F_PROTOCOL_FEATURES  30
+/* Protocol feature bits */
+#define VHOST_USER_PROTOCOL_F_CONFIG    9
+/* Vring state index masks */
+#define VHOST_USER_VRING_INDEX_MASK     0xff
+#define VHOST_USER_VRING_POLL_MASK      BIT(8)
+
+/* Supported version */
+#define VHOST_USER_VERSION              1
+/* Supported transport features */
+#define VHOST_USER_SUPPORTED_F          BIT_ULL(VHOST_USER_F_PROTOCOL_FEATURES)
+/* Supported protocol features */
+#define VHOST_USER_SUPPORTED_PROTOCOL_F BIT_ULL(VHOST_USER_PROTOCOL_F_CONFIG)
+
+enum vhost_user_request {
+        VHOST_USER_GET_FEATURES = 1,
+        VHOST_USER_SET_FEATURES = 2,
+        VHOST_USER_SET_OWNER = 3,
+        VHOST_USER_RESET_OWNER = 4,
+        VHOST_USER_SET_MEM_TABLE = 5,
+        VHOST_USER_SET_LOG_BASE = 6,
+        VHOST_USER_SET_LOG_FD = 7,
+        VHOST_USER_SET_VRING_NUM = 8,
+        VHOST_USER_SET_VRING_ADDR = 9,
+        VHOST_USER_SET_VRING_BASE = 10,
+        VHOST_USER_GET_VRING_BASE = 11,
+        VHOST_USER_SET_VRING_KICK = 12,
+        VHOST_USER_SET_VRING_CALL = 13,
+        VHOST_USER_SET_VRING_ERR = 14,
+        VHOST_USER_GET_PROTOCOL_FEATURES = 15,
+        VHOST_USER_SET_PROTOCOL_FEATURES = 16,
+        VHOST_USER_GET_QUEUE_NUM = 17,
+        VHOST_USER_SET_VRING_ENABLE = 18,
+        VHOST_USER_SEND_RARP = 19,
+        VHOST_USER_NET_SEND_MTU = 20,
+        VHOST_USER_SET_SLAVE_REQ_FD = 21,
+        VHOST_USER_IOTLB_MSG = 22,
+        VHOST_USER_SET_VRING_ENDIAN = 23,
+        VHOST_USER_GET_CONFIG = 24,
+        VHOST_USER_SET_CONFIG = 25,
+};
+
+struct vhost_user_header {
+        u32 request; /* Use enum vhost_user_request */
+        u32 flags;
+        u32 size;
+} __packed;
+
+struct vhost_user_config {
+        u32 offset;
+        u32 size;
+        u32 flags;
+        u8 payload[0]; /* Variable length */
+} __packed;
+
+struct vhost_user_vring_state {
+        u32 index;
+        u32 num;
+} __packed;
+
+struct vhost_user_vring_addr {
+        u32 index;
+        u32 flags;
+        u64 desc, used, avail, log;
+} __packed;
+
+struct vhost_user_mem_region {
+        u64 guest_addr;
+        u64 size;
+        u64 user_addr;
+        u64 mmap_offset;
+} __packed;
+
+struct vhost_user_mem_regions {
+        u32 num;
+        u32 padding;
+        struct vhost_user_mem_region regions[2]; /* Currently supporting 2 */
+} __packed;
+
+union vhost_user_payload {
+        u64 integer;
+        struct vhost_user_config config;
+        struct vhost_user_vring_state vring_state;
+        struct vhost_user_vring_addr vring_addr;
+        struct vhost_user_mem_regions mem_regions;
+};
+
+struct vhost_user_msg {
+        struct vhost_user_header header;
+        union vhost_user_payload payload;
+} __packed;
+
+#endif