| /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
| #ifndef _LINUX_VHOST_H |
| #define _LINUX_VHOST_H |
| /* Userspace interface for in-kernel virtio accelerators. */ |
| |
| /* vhost is used to reduce the number of system calls involved in virtio. |
| * |
| * Existing virtio net code is used in the guest without modification. |
| * |
| * This header includes interface used by userspace hypervisor for |
| * device configuration. |
| */ |
| |
| #include <linux/vhost_types.h> |
| #include <linux/types.h> |
| #include <linux/ioctl.h> |
| |
| /* ioctls */ |
| |
| #define VHOST_VIRTIO 0xAF |
| |
| /* Features bitmask for forward compatibility. Transport bits are used for |
| * vhost specific features. */ |
| #define VHOST_GET_FEATURES _IOR(VHOST_VIRTIO, 0x00, __u64) |
| #define VHOST_SET_FEATURES _IOW(VHOST_VIRTIO, 0x00, __u64) |
| |
| /* Set current process as the (exclusive) owner of this file descriptor. This |
| * must be called before any other vhost command. Further calls to |
| * VHOST_OWNER_SET fail until VHOST_OWNER_RESET is called. */ |
| #define VHOST_SET_OWNER _IO(VHOST_VIRTIO, 0x01) |
| /* Give up ownership, and reset the device to default values. |
| * Allows subsequent call to VHOST_OWNER_SET to succeed. */ |
| #define VHOST_RESET_OWNER _IO(VHOST_VIRTIO, 0x02) |
| |
| /* Set up/modify memory layout */ |
| #define VHOST_SET_MEM_TABLE _IOW(VHOST_VIRTIO, 0x03, struct vhost_memory) |
| |
| /* Write logging setup. */ |
| /* Memory writes can optionally be logged by setting bit at an offset |
| * (calculated from the physical address) from specified log base. |
| * The bit is set using an atomic 32 bit operation. */ |
| /* Set base address for logging. */ |
| #define VHOST_SET_LOG_BASE _IOW(VHOST_VIRTIO, 0x04, __u64) |
| /* Specify an eventfd file descriptor to signal on log write. */ |
| #define VHOST_SET_LOG_FD _IOW(VHOST_VIRTIO, 0x07, int) |
| |
| /* Ring setup. */ |
| /* Set number of descriptors in ring. This parameter can not |
| * be modified while ring is running (bound to a device). */ |
| #define VHOST_SET_VRING_NUM _IOW(VHOST_VIRTIO, 0x10, struct vhost_vring_state) |
| /* Set addresses for the ring. */ |
| #define VHOST_SET_VRING_ADDR _IOW(VHOST_VIRTIO, 0x11, struct vhost_vring_addr) |
| /* Base value where queue looks for available descriptors */ |
| #define VHOST_SET_VRING_BASE _IOW(VHOST_VIRTIO, 0x12, struct vhost_vring_state) |
| /* Get accessor: reads index, writes value in num */ |
| #define VHOST_GET_VRING_BASE _IOWR(VHOST_VIRTIO, 0x12, struct vhost_vring_state) |
| |
| /* Set the vring byte order in num. Valid values are VHOST_VRING_LITTLE_ENDIAN |
| * or VHOST_VRING_BIG_ENDIAN (other values return -EINVAL). |
| * The byte order cannot be changed while the device is active: trying to do so |
| * returns -EBUSY. |
| * This is a legacy only API that is simply ignored when VIRTIO_F_VERSION_1 is |
| * set. |
| * Not all kernel configurations support this ioctl, but all configurations that |
| * support SET also support GET. |
| */ |
| #define VHOST_VRING_LITTLE_ENDIAN 0 |
| #define VHOST_VRING_BIG_ENDIAN 1 |
| #define VHOST_SET_VRING_ENDIAN _IOW(VHOST_VIRTIO, 0x13, struct vhost_vring_state) |
| #define VHOST_GET_VRING_ENDIAN _IOW(VHOST_VIRTIO, 0x14, struct vhost_vring_state) |
| |
| /* The following ioctls use eventfd file descriptors to signal and poll |
| * for events. */ |
| |
| /* Set eventfd to poll for added buffers */ |
| #define VHOST_SET_VRING_KICK _IOW(VHOST_VIRTIO, 0x20, struct vhost_vring_file) |
| /* Set eventfd to signal when buffers have beed used */ |
| #define VHOST_SET_VRING_CALL _IOW(VHOST_VIRTIO, 0x21, struct vhost_vring_file) |
| /* Set eventfd to signal an error */ |
| #define VHOST_SET_VRING_ERR _IOW(VHOST_VIRTIO, 0x22, struct vhost_vring_file) |
| /* Set busy loop timeout (in us) */ |
| #define VHOST_SET_VRING_BUSYLOOP_TIMEOUT _IOW(VHOST_VIRTIO, 0x23, \ |
| struct vhost_vring_state) |
| /* Get busy loop timeout (in us) */ |
| #define VHOST_GET_VRING_BUSYLOOP_TIMEOUT _IOW(VHOST_VIRTIO, 0x24, \ |
| struct vhost_vring_state) |
| |
| /* Set or get vhost backend capability */ |
| |
| /* Use message type V2 */ |
| #define VHOST_BACKEND_F_IOTLB_MSG_V2 0x1 |
| |
| #define VHOST_SET_BACKEND_FEATURES _IOW(VHOST_VIRTIO, 0x25, __u64) |
| #define VHOST_GET_BACKEND_FEATURES _IOR(VHOST_VIRTIO, 0x26, __u64) |
| |
| /* VHOST_NET specific defines */ |
| |
| /* Attach virtio net ring to a raw socket, or tap device. |
| * The socket must be already bound to an ethernet device, this device will be |
| * used for transmit. Pass fd -1 to unbind from the socket and the transmit |
| * device. This can be used to stop the ring (e.g. for migration). */ |
| #define VHOST_NET_SET_BACKEND _IOW(VHOST_VIRTIO, 0x30, struct vhost_vring_file) |
| |
| /* VHOST_SCSI specific defines */ |
| |
| #define VHOST_SCSI_SET_ENDPOINT _IOW(VHOST_VIRTIO, 0x40, struct vhost_scsi_target) |
| #define VHOST_SCSI_CLEAR_ENDPOINT _IOW(VHOST_VIRTIO, 0x41, struct vhost_scsi_target) |
| /* Changing this breaks userspace. */ |
| #define VHOST_SCSI_GET_ABI_VERSION _IOW(VHOST_VIRTIO, 0x42, int) |
| /* Set and get the events missed flag */ |
| #define VHOST_SCSI_SET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x43, __u32) |
| #define VHOST_SCSI_GET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x44, __u32) |
| |
| /* VHOST_VSOCK specific defines */ |
| |
| #define VHOST_VSOCK_SET_GUEST_CID _IOW(VHOST_VIRTIO, 0x60, __u64) |
| #define VHOST_VSOCK_SET_RUNNING _IOW(VHOST_VIRTIO, 0x61, int) |
| |
| #endif |
