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 <linux/types.h> 15 #include <linux/compiler.h> 16 #include <linux/virtio_config.h> 17 #include <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 __u64 desc_user_addr; 40 /* Used structure address. Must be 32 bit aligned */ 41 __u64 used_user_addr; 42 /* Available structure address. Must be 16 bit aligned */ 43 __u64 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 __u64 log_guest_addr; 48 }; 49 50 /* no alignment requirement */ 51 struct vhost_iotlb_msg { 52 __u64 iova; 53 __u64 size; 54 __u64 uaddr; 55 #define VHOST_ACCESS_RO 0x1 56 #define VHOST_ACCESS_WO 0x2 57 #define VHOST_ACCESS_RW 0x3 58 __u8 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 /* 64 * VHOST_IOTLB_BATCH_BEGIN and VHOST_IOTLB_BATCH_END allow modifying 65 * multiple mappings in one go: beginning with 66 * VHOST_IOTLB_BATCH_BEGIN, followed by any number of 67 * VHOST_IOTLB_UPDATE messages, and ending with VHOST_IOTLB_BATCH_END. 68 * When one of these two values is used as the message type, the rest 69 * of the fields in the message are ignored. There's no guarantee that 70 * these changes take place automatically in the device. 71 */ 72 #define VHOST_IOTLB_BATCH_BEGIN 5 73 #define VHOST_IOTLB_BATCH_END 6 74 __u8 type; 75 }; 76 77 #define VHOST_IOTLB_MSG 0x1 78 #define VHOST_IOTLB_MSG_V2 0x2 79 80 struct vhost_msg { 81 int type; 82 union { 83 struct vhost_iotlb_msg iotlb; 84 __u8 padding[64]; 85 }; 86 }; 87 88 struct vhost_msg_v2 { 89 __u32 type; 90 __u32 reserved; 91 union { 92 struct vhost_iotlb_msg iotlb; 93 __u8 padding[64]; 94 }; 95 }; 96 97 struct vhost_memory_region { 98 __u64 guest_phys_addr; 99 __u64 memory_size; /* bytes */ 100 __u64 userspace_addr; 101 __u64 flags_padding; /* No flags are currently specified. */ 102 }; 103 104 /* All region addresses and sizes must be 4K aligned. */ 105 #define VHOST_PAGE_SIZE 0x1000 106 107 struct vhost_memory { 108 __u32 nregions; 109 __u32 padding; 110 struct vhost_memory_region regions[0]; 111 }; 112 113 /* VHOST_SCSI specific definitions */ 114 115 /* 116 * Used by QEMU userspace to ensure a consistent vhost-scsi ABI. 117 * 118 * ABI Rev 0: July 2012 version starting point for v3.6-rc merge candidate + 119 * RFC-v2 vhost-scsi userspace. Add GET_ABI_VERSION ioctl usage 120 * ABI Rev 1: January 2013. Ignore vhost_tpgt field in struct vhost_scsi_target. 121 * All the targets under vhost_wwpn can be seen and used by guset. 122 */ 123 124 #define VHOST_SCSI_ABI_VERSION 1 125 126 struct vhost_scsi_target { 127 int abi_version; 128 char vhost_wwpn[224]; /* TRANSPORT_IQN_LEN */ 129 unsigned short vhost_tpgt; 130 unsigned short reserved; 131 }; 132 133 /* VHOST_VDPA specific definitions */ 134 135 struct vhost_vdpa_config { 136 __u32 off; 137 __u32 len; 138 __u8 buf[0]; 139 }; 140 141 /* vhost vdpa IOVA range 142 * @first: First address that can be mapped by vhost-vDPA 143 * @last: Last address that can be mapped by vhost-vDPA 144 */ 145 struct vhost_vdpa_iova_range { 146 __u64 first; 147 __u64 last; 148 }; 149 150 /* Feature bits */ 151 /* Log all write descriptors. Can be changed while device is active. */ 152 #define VHOST_F_LOG_ALL 26 153 /* vhost-net should add virtio_net_hdr for RX, and strip for TX packets. */ 154 #define VHOST_NET_F_VIRTIO_NET_HDR 27 155 156 #endif 157