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// 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)
#define VHOST_USER_FLAG_NEED_REPLY BIT(3)
/* Feature bits */
#define VHOST_USER_F_PROTOCOL_FEATURES 30
/* Protocol feature bits */
#define VHOST_USER_PROTOCOL_F_REPLY_ACK 3
#define VHOST_USER_PROTOCOL_F_SLAVE_REQ 5
#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_REPLY_ACK) | \
BIT_ULL(VHOST_USER_PROTOCOL_F_SLAVE_REQ) | \
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,
};
enum vhost_user_slave_request {
VHOST_USER_SLAVE_IOTLB_MSG = 1,
VHOST_USER_SLAVE_CONFIG_CHANGE_MSG = 2,
VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG = 3,
};
struct vhost_user_header {
/*
* Use enum vhost_user_request for outgoing messages,
* uses enum vhost_user_slave_request for incoming ones.
*/
u32 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
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