include/standard-headers/linux/vhost_types.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _LINUX_VHOST_TYPES_H
#define _LINUX_VHOST_TYPES_H
/* Userspace interface for in-kernel virtio accelerators. */

/* vhost is used to reduce the number of system calls involved in virtio.
 *
 * Existing virtio net code is used in the guest without modification.
 *
 * This header includes interface used by userspace hypervisor for
 * device configuration.
 */

#include "standard-headers/linux/types.h"

#include "standard-headers/linux/virtio_config.h"
#include "standard-headers/linux/virtio_ring.h"

struct vhost_vring_state {
	unsigned int index;
	unsigned int num;
};

struct vhost_vring_file {
	unsigned int index;
	int fd; /* Pass -1 to unbind from file. */

};

struct vhost_vring_addr {
	unsigned int index;
	/* Option flags. */
	unsigned int flags;
	/* Flag values: */
	/* Whether log address is valid. If set enables logging. */
#define VHOST_VRING_F_LOG 0

	/* Start of array of descriptors (virtually contiguous) */
	uint64_t desc_user_addr;
	/* Used structure address. Must be 32 bit aligned */
	uint64_t used_user_addr;
	/* Available structure address. Must be 16 bit aligned */
	uint64_t avail_user_addr;
	/* Logging support. */
	/* Log writes to used structure, at offset calculated from specified
	 * address. Address must be 32 bit aligned. */
	uint64_t log_guest_addr;
};

/* no alignment requirement */
struct vhost_iotlb_msg {
	uint64_t iova;
	uint64_t size;
	uint64_t uaddr;
#define VHOST_ACCESS_RO      0x1
#define VHOST_ACCESS_WO      0x2
#define VHOST_ACCESS_RW      0x3
	uint8_t perm;
#define VHOST_IOTLB_MISS           1
#define VHOST_IOTLB_UPDATE         2
#define VHOST_IOTLB_INVALIDATE     3
#define VHOST_IOTLB_ACCESS_FAIL    4
	uint8_t type;
};

#define VHOST_IOTLB_MSG 0x1
#define VHOST_IOTLB_MSG_V2 0x2

struct vhost_msg {
	int type;
	union {
		struct vhost_iotlb_msg iotlb;
		uint8_t padding[64];
	};
};

struct vhost_msg_v2 {
	uint32_t type;
	uint32_t reserved;
	union {
		struct vhost_iotlb_msg iotlb;
		uint8_t padding[64];
	};
};

struct vhost_memory_region {
	uint64_t guest_phys_addr;
	uint64_t memory_size; /* bytes */
	uint64_t userspace_addr;
	uint64_t flags_padding; /* No flags are currently specified. */
};

/* All region addresses and sizes must be 4K aligned. */
#define VHOST_PAGE_SIZE 0x1000

struct vhost_memory {
	uint32_t nregions;
	uint32_t padding;
	struct vhost_memory_region regions[0];
};

/* VHOST_SCSI specific definitions */

/*
 * Used by QEMU userspace to ensure a consistent vhost-scsi ABI.
 *
 * ABI Rev 0: July 2012 version starting point for v3.6-rc merge candidate +
 *            RFC-v2 vhost-scsi userspace.  Add GET_ABI_VERSION ioctl usage
 * ABI Rev 1: January 2013. Ignore vhost_tpgt field in struct vhost_scsi_target.
 *            All the targets under vhost_wwpn can be seen and used by guset.
 */

#define VHOST_SCSI_ABI_VERSION	1

struct vhost_scsi_target {
	int abi_version;
	char vhost_wwpn[224]; /* TRANSPORT_IQN_LEN */
	unsigned short vhost_tpgt;
	unsigned short reserved;
};

/* Feature bits */
/* Log all write descriptors. Can be changed while device is active. */
#define VHOST_F_LOG_ALL 26
/* vhost-net should add virtio_net_hdr for RX, and strip for TX packets. */
#define VHOST_NET_F_VIRTIO_NET_HDR 27

#endif