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1 | #ifndef _LINUX_VHOST_H |
2 | #define _LINUX_VHOST_H |
3 | /* Userspace interface for in-kernel virtio accelerators. */ |
4 | |
5 | /* vhost is used to reduce the number of system calls involved in virtio. |
6 | * |
7 | * Existing virtio net code is used in the guest without modification. |
8 | * |
9 | * This header includes interface used by userspace hypervisor for |
10 | * device configuration. |
11 | */ |
12 | |
13 | #include <linux/types.h> |
14 | #include <linux/compiler.h> |
15 | #include <linux/ioctl.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 | struct vhost_memory_region { |
51 | __u64 guest_phys_addr; |
52 | __u64 memory_size; /* bytes */ |
53 | __u64 userspace_addr; |
54 | __u64 flags_padding; /* No flags are currently specified. */ |
55 | }; |
56 | |
57 | /* All region addresses and sizes must be 4K aligned. */ |
58 | #define VHOST_PAGE_SIZE 0x1000 |
59 | |
60 | struct vhost_memory { |
61 | __u32 nregions; |
62 | __u32 padding; |
63 | struct vhost_memory_region regions[0]; |
64 | }; |
65 | |
66 | /* ioctls */ |
67 | |
68 | #define VHOST_VIRTIO 0xAF |
69 | |
70 | /* Features bitmask for forward compatibility. Transport bits are used for |
71 | * vhost specific features. */ |
72 | #define VHOST_GET_FEATURES _IOR(VHOST_VIRTIO, 0x00, __u64) |
73 | #define VHOST_SET_FEATURES _IOW(VHOST_VIRTIO, 0x00, __u64) |
74 | |
75 | /* Set current process as the (exclusive) owner of this file descriptor. This |
76 | * must be called before any other vhost command. Further calls to |
77 | * VHOST_OWNER_SET fail until VHOST_OWNER_RESET is called. */ |
78 | #define VHOST_SET_OWNER _IO(VHOST_VIRTIO, 0x01) |
79 | /* Give up ownership, and reset the device to default values. |
80 | * Allows subsequent call to VHOST_OWNER_SET to succeed. */ |
81 | #define VHOST_RESET_OWNER _IO(VHOST_VIRTIO, 0x02) |
82 | |
83 | /* Set up/modify memory layout */ |
84 | #define VHOST_SET_MEM_TABLE _IOW(VHOST_VIRTIO, 0x03, struct vhost_memory) |
85 | |
86 | /* Write logging setup. */ |
87 | /* Memory writes can optionally be logged by setting bit at an offset |
88 | * (calculated from the physical address) from specified log base. |
89 | * The bit is set using an atomic 32 bit operation. */ |
90 | /* Set base address for logging. */ |
91 | #define VHOST_SET_LOG_BASE _IOW(VHOST_VIRTIO, 0x04, __u64) |
92 | /* Specify an eventfd file descriptor to signal on log write. */ |
93 | #define VHOST_SET_LOG_FD _IOW(VHOST_VIRTIO, 0x07, int) |
94 | |
95 | /* Ring setup. */ |
96 | /* Set number of descriptors in ring. This parameter can not |
97 | * be modified while ring is running (bound to a device). */ |
98 | #define VHOST_SET_VRING_NUM _IOW(VHOST_VIRTIO, 0x10, struct vhost_vring_state) |
99 | /* Set addresses for the ring. */ |
100 | #define VHOST_SET_VRING_ADDR _IOW(VHOST_VIRTIO, 0x11, struct vhost_vring_addr) |
101 | /* Base value where queue looks for available descriptors */ |
102 | #define VHOST_SET_VRING_BASE _IOW(VHOST_VIRTIO, 0x12, struct vhost_vring_state) |
103 | /* Get accessor: reads index, writes value in num */ |
104 | #define VHOST_GET_VRING_BASE _IOWR(VHOST_VIRTIO, 0x12, struct vhost_vring_state) |
105 | |
106 | /* The following ioctls use eventfd file descriptors to signal and poll |
107 | * for events. */ |
108 | |
109 | /* Set eventfd to poll for added buffers */ |
110 | #define VHOST_SET_VRING_KICK _IOW(VHOST_VIRTIO, 0x20, struct vhost_vring_file) |
111 | /* Set eventfd to signal when buffers have beed used */ |
112 | #define VHOST_SET_VRING_CALL _IOW(VHOST_VIRTIO, 0x21, struct vhost_vring_file) |
113 | /* Set eventfd to signal an error */ |
114 | #define VHOST_SET_VRING_ERR _IOW(VHOST_VIRTIO, 0x22, struct vhost_vring_file) |
115 | |
116 | /* VHOST_NET specific defines */ |
117 | |
118 | /* Attach virtio net ring to a raw socket, or tap device. |
119 | * The socket must be already bound to an ethernet device, this device will be |
120 | * used for transmit. Pass fd -1 to unbind from the socket and the transmit |
121 | * device. This can be used to stop the ring (e.g. for migration). */ |
122 | #define VHOST_NET_SET_BACKEND _IOW(VHOST_VIRTIO, 0x30, struct vhost_vring_file) |
123 | |
124 | /* Feature bits */ |
125 | /* Log all write descriptors. Can be changed while device is active. */ |
126 | #define VHOST_F_LOG_ALL 26 |
127 | /* vhost-net should add virtio_net_hdr for RX, and strip for TX packets. */ |
128 | #define VHOST_NET_F_VIRTIO_NET_HDR 27 |
129 | |
130 | #endif |
131 |
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