1 #ifndef VFIO_USER_PROTOCOL_H 2 #define VFIO_USER_PROTOCOL_H 3 4 /* 5 * vfio protocol over a UNIX socket. 6 * 7 * Copyright © 2018, 2021 Oracle and/or its affiliates. 8 * 9 * Each message has a standard header that describes the command 10 * being sent, which is almost always a VFIO ioctl(). 11 * 12 * The header may be followed by command-specific data, such as the 13 * region and offset info for read and write commands. 14 * 15 * SPDX-License-Identifier: GPL-2.0-or-later 16 */ 17 18 typedef struct { 19 uint16_t id; 20 uint16_t command; 21 uint32_t size; 22 uint32_t flags; 23 uint32_t error_reply; 24 } VFIOUserHdr; 25 26 /* VFIOUserHdr commands */ 27 enum vfio_user_command { 28 VFIO_USER_VERSION = 1, 29 VFIO_USER_DMA_MAP = 2, 30 VFIO_USER_DMA_UNMAP = 3, 31 VFIO_USER_DEVICE_GET_INFO = 4, 32 VFIO_USER_DEVICE_GET_REGION_INFO = 5, 33 VFIO_USER_DEVICE_GET_REGION_IO_FDS = 6, 34 VFIO_USER_DEVICE_GET_IRQ_INFO = 7, 35 VFIO_USER_DEVICE_SET_IRQS = 8, 36 VFIO_USER_REGION_READ = 9, 37 VFIO_USER_REGION_WRITE = 10, 38 VFIO_USER_DMA_READ = 11, 39 VFIO_USER_DMA_WRITE = 12, 40 VFIO_USER_DEVICE_RESET = 13, 41 VFIO_USER_DIRTY_PAGES = 14, 42 VFIO_USER_MAX, 43 }; 44 45 /* VFIOUserHdr flags */ 46 #define VFIO_USER_REQUEST 0x0 47 #define VFIO_USER_REPLY 0x1 48 #define VFIO_USER_TYPE 0xF 49 50 #define VFIO_USER_NO_REPLY 0x10 51 #define VFIO_USER_ERROR 0x20 52 53 54 /* 55 * VFIO_USER_VERSION 56 */ 57 typedef struct { 58 VFIOUserHdr hdr; 59 uint16_t major; 60 uint16_t minor; 61 char capabilities[]; 62 } VFIOUserVersion; 63 64 #define VFIO_USER_MAJOR_VER 0 65 #define VFIO_USER_MINOR_VER 0 66 67 #define VFIO_USER_CAP "capabilities" 68 69 /* "capabilities" members */ 70 #define VFIO_USER_CAP_MAX_FDS "max_msg_fds" 71 #define VFIO_USER_CAP_MAX_XFER "max_data_xfer_size" 72 #define VFIO_USER_CAP_PGSIZES "pgsizes" 73 #define VFIO_USER_CAP_MAP_MAX "max_dma_maps" 74 #define VFIO_USER_CAP_MIGR "migration" 75 76 /* "migration" members */ 77 #define VFIO_USER_CAP_PGSIZE "pgsize" 78 #define VFIO_USER_CAP_MAX_BITMAP "max_bitmap_size" 79 80 /* 81 * Max FDs mainly comes into play when a device supports multiple interrupts 82 * where each ones uses an eventfd to inject it into the guest. 83 * It is clamped by the the number of FDs the qio channel supports in a 84 * single message. 85 */ 86 #define VFIO_USER_DEF_MAX_FDS 8 87 #define VFIO_USER_MAX_MAX_FDS 16 88 89 /* 90 * Max transfer limits the amount of data in region and DMA messages. 91 * Region R/W will be very small (limited by how much a single instruction 92 * can process) so just use a reasonable limit here. 93 */ 94 #define VFIO_USER_DEF_MAX_XFER (1024 * 1024) 95 #define VFIO_USER_MAX_MAX_XFER (64 * 1024 * 1024) 96 97 /* 98 * Default pagesizes supported is 4k. 99 */ 100 #define VFIO_USER_DEF_PGSIZE 4096 101 102 /* 103 * Default max number of DMA mappings is stolen from the 104 * linux kernel "dma_entry_limit" 105 */ 106 #define VFIO_USER_DEF_MAP_MAX 65535 107 108 /* 109 * Default max bitmap size is also take from the linux kernel, 110 * where usage of signed ints limits the VA range to 2^31 bytes. 111 * Dividing that by the number of bits per byte yields 256MB 112 */ 113 #define VFIO_USER_DEF_MAX_BITMAP (256 * 1024 * 1024) 114 115 #endif /* VFIO_USER_PROTOCOL_H */ 116