include/standard-headers/linux/vhost_types.h

   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