1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 #ifndef _LINUX_VHOST_TYPES_H 3 #define _LINUX_VHOST_TYPES_H 4 /* Userspace interface for in-kernel virtio accelerators. */ 5 6 /* vhost is used to reduce the number of system calls involved in virtio. 7 * 8 * Existing virtio net code is used in the guest without modification. 9 * 10 * This header includes interface used by userspace hypervisor for 11 * device configuration. 12 */ 13 14 #include "standard-headers/linux/types.h" 15 16 #include "standard-headers/linux/virtio_config.h" 17 #include "standard-headers/linux/virtio_ring.h" 18 19 struct vhost_vring_state { 20 unsigned int index; 21 unsigned int num; 22 }; 23 24 struct vhost_vring_file { 25 unsigned int index; 26 int fd; /* Pass -1 to unbind from file. */ 27 28 }; 29 30 struct vhost_vring_addr { 31 unsigned int index; 32 /* Option flags. */ 33 unsigned int flags; 34 /* Flag values: */ 35 /* Whether log address is valid. If set enables logging. */ 36 #define VHOST_VRING_F_LOG 0 37 38 /* Start of array of descriptors (virtually contiguous) */ 39 uint64_t desc_user_addr; 40 /* Used structure address. Must be 32 bit aligned */ 41 uint64_t used_user_addr; 42 /* Available structure address. Must be 16 bit aligned */ 43 uint64_t avail_user_addr; 44 /* Logging support. */ 45 /* Log writes to used structure, at offset calculated from specified 46 * address. Address must be 32 bit aligned. */ 47 uint64_t log_guest_addr; 48 }; 49 50 /* no alignment requirement */ 51 struct vhost_iotlb_msg { 52 uint64_t iova; 53 uint64_t size; 54 uint64_t uaddr; 55 #define VHOST_ACCESS_RO 0x1 56 #define VHOST_ACCESS_WO 0x2 57 #define VHOST_ACCESS_RW 0x3 58 uint8_t perm; 59 #define VHOST_IOTLB_MISS 1 60 #define VHOST_IOTLB_UPDATE 2 61 #define VHOST_IOTLB_INVALIDATE 3 62 #define VHOST_IOTLB_ACCESS_FAIL 4 63 uint8_t type; 64 }; 65 66 #define VHOST_IOTLB_MSG 0x1 67 #define VHOST_IOTLB_MSG_V2 0x2 68 69 struct vhost_msg { 70 int type; 71 union { 72 struct vhost_iotlb_msg iotlb; 73 uint8_t padding[64]; 74 }; 75 }; 76 77 struct vhost_msg_v2 { 78 uint32_t type; 79 uint32_t reserved; 80 union { 81 struct vhost_iotlb_msg iotlb; 82 uint8_t padding[64]; 83 }; 84 }; 85 86 struct vhost_memory_region { 87 uint64_t guest_phys_addr; 88 uint64_t memory_size; /* bytes */ 89 uint64_t userspace_addr; 90 uint64_t flags_padding; /* No flags are currently specified. */ 91 }; 92 93 /* All region addresses and sizes must be 4K aligned. */ 94 #define VHOST_PAGE_SIZE 0x1000 95 96 struct vhost_memory { 97 uint32_t nregions; 98 uint32_t padding; 99 struct vhost_memory_region regions[0]; 100 }; 101 102 /* VHOST_SCSI specific definitions */ 103 104 /* 105 * Used by QEMU userspace to ensure a consistent vhost-scsi ABI. 106 * 107 * ABI Rev 0: July 2012 version starting point for v3.6-rc merge candidate + 108 * RFC-v2 vhost-scsi userspace. Add GET_ABI_VERSION ioctl usage 109 * ABI Rev 1: January 2013. Ignore vhost_tpgt field in struct vhost_scsi_target. 110 * All the targets under vhost_wwpn can be seen and used by guset. 111 */ 112 113 #define VHOST_SCSI_ABI_VERSION 1 114 115 struct vhost_scsi_target { 116 int abi_version; 117 char vhost_wwpn[224]; /* TRANSPORT_IQN_LEN */ 118 unsigned short vhost_tpgt; 119 unsigned short reserved; 120 }; 121 122 /* VHOST_VDPA specific definitions */ 123 124 struct vhost_vdpa_config { 125 uint32_t off; 126 uint32_t len; 127 uint8_t buf[0]; 128 }; 129 130 /* Feature bits */ 131 /* Log all write descriptors. Can be changed while device is active. */ 132 #define VHOST_F_LOG_ALL 26 133 /* vhost-net should add virtio_net_hdr for RX, and strip for TX packets. */ 134 #define VHOST_NET_F_VIRTIO_NET_HDR 27 135 136 #endif 137