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1.1 root 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:
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
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