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/include/linux/vhost.h

https://github.com/airy09/android_kernel_sony_apq8064
C Header | 130 lines | 55 code | 23 blank | 52 comment | 0 complexity | 68e78a39303be457b2cde7389245392f MD5 | raw file
  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
 19struct vhost_vring_state {
 20	unsigned int index;
 21	unsigned int num;
 22};
 23
 24struct vhost_vring_file {
 25	unsigned int index;
 26	int fd; /* Pass -1 to unbind from file. */
 27
 28};
 29
 30struct 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
 50struct 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
 60struct 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