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vhost_types.h
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #ifndef _LINUX_VHOST_TYPES_H #define _LINUX_VHOST_TYPES_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/types.h> #include <linux/virtio_config.h> #include <linux/virtio_ring.h> struct vhost_vring_state { unsigned int index; unsigned int num; }; struct vhost_vring_file { unsigned int index; int fd; /* Pass -1 to unbind from file. */ }; struct vhost_vring_addr { unsigned int index; /* Option flags. */ unsigned int flags; /* Flag values: */ /* Whether log address is valid. If set enables logging. */ #define VHOST_VRING_F_LOG 0 /* Start of array of descriptors (virtually contiguous) */ __u64 desc_user_addr; /* Used structure address. Must be 32 bit aligned */ __u64 used_user_addr; /* Available structure address. Must be 16 bit aligned */ __u64 avail_user_addr; /* Logging support. */ /* Log writes to used structure, at offset calculated from specified * address. Address must be 32 bit aligned. */ __u64 log_guest_addr; }; struct vhost_worker_state { /* * For VHOST_NEW_WORKER the kernel will return the new vhost_worker id. * For VHOST_FREE_WORKER this must be set to the id of the vhost_worker * to free. */ unsigned int worker_id; }; struct vhost_vring_worker { /* vring index */ unsigned int index; /* The id of the vhost_worker returned from VHOST_NEW_WORKER */ unsigned int worker_id; }; /* no alignment requirement */ struct vhost_iotlb_msg { __u64 iova; __u64 size; __u64 uaddr; #define VHOST_ACCESS_RO 0x1 #define VHOST_ACCESS_WO 0x2 #define VHOST_ACCESS_RW 0x3 __u8 perm; #define VHOST_IOTLB_MISS 1 #define VHOST_IOTLB_UPDATE 2 #define VHOST_IOTLB_INVALIDATE 3 #define VHOST_IOTLB_ACCESS_FAIL 4 /* * VHOST_IOTLB_BATCH_BEGIN and VHOST_IOTLB_BATCH_END allow modifying * multiple mappings in one go: beginning with * VHOST_IOTLB_BATCH_BEGIN, followed by any number of * VHOST_IOTLB_UPDATE messages, and ending with VHOST_IOTLB_BATCH_END. * When one of these two values is used as the message type, the rest * of the fields in the message are ignored. There's no guarantee that * these changes take place automatically in the device. */ #define VHOST_IOTLB_BATCH_BEGIN 5 #define VHOST_IOTLB_BATCH_END 6 __u8 type; }; #define VHOST_IOTLB_MSG 0x1 #define VHOST_IOTLB_MSG_V2 0x2 struct vhost_msg { int type; union { struct vhost_iotlb_msg iotlb; __u8 padding[64]; }; }; struct vhost_msg_v2 { __u32 type; __u32 asid; union { struct vhost_iotlb_msg iotlb; __u8 padding[64]; }; }; struct vhost_memory_region { __u64 guest_phys_addr; __u64 memory_size; /* bytes */ __u64 userspace_addr; __u64 flags_padding; /* No flags are currently specified. */ }; /* All region addresses and sizes must be 4K aligned. */ #define VHOST_PAGE_SIZE 0x1000 struct vhost_memory { __u32 nregions; __u32 padding; struct vhost_memory_region regions[]; }; /* VHOST_SCSI specific definitions */ /* * Used by QEMU userspace to ensure a consistent vhost-scsi ABI. * * ABI Rev 0: July 2012 version starting point for v3.6-rc merge candidate + * RFC-v2 vhost-scsi userspace. Add GET_ABI_VERSION ioctl usage * ABI Rev 1: January 2013. Ignore vhost_tpgt field in struct vhost_scsi_target. * All the targets under vhost_wwpn can be seen and used by guset. */ #define VHOST_SCSI_ABI_VERSION 1 struct vhost_scsi_target { int abi_version; char vhost_wwpn[224]; /* TRANSPORT_IQN_LEN */ unsigned short vhost_tpgt; unsigned short reserved; }; /* VHOST_VDPA specific definitions */ struct vhost_vdpa_config { __u32 off; __u32 len; __u8 buf[]; }; /* vhost vdpa IOVA range * @first: First address that can be mapped by vhost-vDPA * @last: Last address that can be mapped by vhost-vDPA */ struct vhost_vdpa_iova_range { __u64 first; __u64 last; }; /* Feature bits */ /* Log all write descriptors. Can be changed while device is active. */ #define VHOST_F_LOG_ALL 26 /* vhost-net should add virtio_net_hdr for RX, and strip for TX packets. */ #define VHOST_NET_F_VIRTIO_NET_HDR 27 /* Use message type V2 */ #define VHOST_BACKEND_F_IOTLB_MSG_V2 0x1 /* IOTLB can accept batching hints */ #define VHOST_BACKEND_F_IOTLB_BATCH 0x2 /* IOTLB can accept address space identifier through V2 type of IOTLB * message */ #define VHOST_BACKEND_F_IOTLB_ASID 0x3 /* Device can be suspended */ #define VHOST_BACKEND_F_SUSPEND 0x4 /* Device can be resumed */ #define VHOST_BACKEND_F_RESUME 0x5 /* Device supports the driver enabling virtqueues both before and after * DRIVER_OK */ #define VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK 0x6 /* Device may expose the virtqueue's descriptor area, driver area and * device area to a different group for ASID binding than where its * buffers may reside. Requires VHOST_BACKEND_F_IOTLB_ASID. */ #define VHOST_BACKEND_F_DESC_ASID 0x7 /* IOTLB don't flush memory mapping across device reset */ #define VHOST_BACKEND_F_IOTLB_PERSIST 0x8 #endif