131 lines
4.5 KiB
C
131 lines
4.5 KiB
C
#ifndef _LINUX_VHOST_H
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#define _LINUX_VHOST_H
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/* Userspace interface for in-kernel virtio accelerators. */
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/* vhost is used to reduce the number of system calls involved in virtio.
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*
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* Existing virtio net code is used in the guest without modification.
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*
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* This header includes interface used by userspace hypervisor for
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* device configuration.
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*/
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#include <linux/types.h>
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#include <linux/compiler.h>
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#include <linux/ioctl.h>
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#include <linux/virtio_config.h>
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#include <linux/virtio_ring.h>
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struct vhost_vring_state {
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unsigned int index;
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unsigned int num;
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};
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struct vhost_vring_file {
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unsigned int index;
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int fd; /* Pass -1 to unbind from file. */
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};
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struct vhost_vring_addr {
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unsigned int index;
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/* Option flags. */
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unsigned int flags;
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/* Flag values: */
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/* Whether log address is valid. If set enables logging. */
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#define VHOST_VRING_F_LOG 0
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/* Start of array of descriptors (virtually contiguous) */
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__u64 desc_user_addr;
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/* Used structure address. Must be 32 bit aligned */
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__u64 used_user_addr;
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/* Available structure address. Must be 16 bit aligned */
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__u64 avail_user_addr;
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/* Logging support. */
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/* Log writes to used structure, at offset calculated from specified
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* address. Address must be 32 bit aligned. */
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__u64 log_guest_addr;
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};
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struct vhost_memory_region {
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__u64 guest_phys_addr;
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__u64 memory_size; /* bytes */
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__u64 userspace_addr;
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__u64 flags_padding; /* No flags are currently specified. */
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};
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/* All region addresses and sizes must be 4K aligned. */
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#define VHOST_PAGE_SIZE 0x1000
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struct vhost_memory {
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__u32 nregions;
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__u32 padding;
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struct vhost_memory_region regions[0];
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};
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/* ioctls */
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#define VHOST_VIRTIO 0xAF
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/* Features bitmask for forward compatibility. Transport bits are used for
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* vhost specific features. */
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#define VHOST_GET_FEATURES _IOR(VHOST_VIRTIO, 0x00, __u64)
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#define VHOST_SET_FEATURES _IOW(VHOST_VIRTIO, 0x00, __u64)
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/* Set current process as the (exclusive) owner of this file descriptor. This
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* must be called before any other vhost command. Further calls to
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* VHOST_OWNER_SET fail until VHOST_OWNER_RESET is called. */
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#define VHOST_SET_OWNER _IO(VHOST_VIRTIO, 0x01)
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/* Give up ownership, and reset the device to default values.
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* Allows subsequent call to VHOST_OWNER_SET to succeed. */
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#define VHOST_RESET_OWNER _IO(VHOST_VIRTIO, 0x02)
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/* Set up/modify memory layout */
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#define VHOST_SET_MEM_TABLE _IOW(VHOST_VIRTIO, 0x03, struct vhost_memory)
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/* Write logging setup. */
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/* Memory writes can optionally be logged by setting bit at an offset
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* (calculated from the physical address) from specified log base.
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* The bit is set using an atomic 32 bit operation. */
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/* Set base address for logging. */
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#define VHOST_SET_LOG_BASE _IOW(VHOST_VIRTIO, 0x04, __u64)
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/* Specify an eventfd file descriptor to signal on log write. */
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#define VHOST_SET_LOG_FD _IOW(VHOST_VIRTIO, 0x07, int)
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/* Ring setup. */
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/* Set number of descriptors in ring. This parameter can not
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* be modified while ring is running (bound to a device). */
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#define VHOST_SET_VRING_NUM _IOW(VHOST_VIRTIO, 0x10, struct vhost_vring_state)
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/* Set addresses for the ring. */
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#define VHOST_SET_VRING_ADDR _IOW(VHOST_VIRTIO, 0x11, struct vhost_vring_addr)
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/* Base value where queue looks for available descriptors */
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#define VHOST_SET_VRING_BASE _IOW(VHOST_VIRTIO, 0x12, struct vhost_vring_state)
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/* Get accessor: reads index, writes value in num */
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#define VHOST_GET_VRING_BASE _IOWR(VHOST_VIRTIO, 0x12, struct vhost_vring_state)
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/* The following ioctls use eventfd file descriptors to signal and poll
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* for events. */
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/* Set eventfd to poll for added buffers */
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#define VHOST_SET_VRING_KICK _IOW(VHOST_VIRTIO, 0x20, struct vhost_vring_file)
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/* Set eventfd to signal when buffers have beed used */
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#define VHOST_SET_VRING_CALL _IOW(VHOST_VIRTIO, 0x21, struct vhost_vring_file)
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/* Set eventfd to signal an error */
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#define VHOST_SET_VRING_ERR _IOW(VHOST_VIRTIO, 0x22, struct vhost_vring_file)
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/* VHOST_NET specific defines */
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/* Attach virtio net ring to a raw socket, or tap device.
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* The socket must be already bound to an ethernet device, this device will be
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* used for transmit. Pass fd -1 to unbind from the socket and the transmit
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* device. This can be used to stop the ring (e.g. for migration). */
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#define VHOST_NET_SET_BACKEND _IOW(VHOST_VIRTIO, 0x30, struct vhost_vring_file)
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/* Feature bits */
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/* Log all write descriptors. Can be changed while device is active. */
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#define VHOST_F_LOG_ALL 26
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/* vhost-net should add virtio_net_hdr for RX, and strip for TX packets. */
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#define VHOST_NET_F_VIRTIO_NET_HDR 27
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#endif
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