/* * vhost-backend * * Copyright (c) 2013 Virtual Open Systems Sarl. * * This work is licensed under the terms of the GNU GPL, version 2 or later. * See the COPYING file in the top-level directory. * */ #include "qemu/osdep.h" #include <linux/vhost.h> #include <sys/ioctl.h> #include "hw/virtio/vhost.h" #include "hw/virtio/vhost-backend.h" #include "qemu/error-report.h" static int vhost_kernel_call(struct vhost_dev *dev, unsigned long int request, void *arg) { int fd = (uintptr_t) dev->opaque; assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_KERNEL); return ioctl(fd, request, arg); } static int vhost_kernel_init(struct vhost_dev *dev, void *opaque) { assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_KERNEL); dev->opaque = opaque; return 0; } static int vhost_kernel_cleanup(struct vhost_dev *dev) { int fd = (uintptr_t) dev->opaque; assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_KERNEL); return close(fd); } static int vhost_kernel_memslots_limit(struct vhost_dev *dev) { int limit = 64; char *s; if (g_file_get_contents("/sys/module/vhost/parameters/max_mem_regions", &s, NULL, NULL)) { uint64_t val = g_ascii_strtoull(s, NULL, 10); if (!((val == G_MAXUINT64 || !val) && errno)) { g_free(s); return val; } error_report("ignoring invalid max_mem_regions value in vhost module:" " %s", s); } g_free(s); return limit; } static int vhost_kernel_net_set_backend(struct vhost_dev *dev, struct vhost_vring_file *file) { return vhost_kernel_call(dev, VHOST_NET_SET_BACKEND, file); } static int vhost_kernel_scsi_set_endpoint(struct vhost_dev *dev, struct vhost_scsi_target *target) { return vhost_kernel_call(dev, VHOST_SCSI_SET_ENDPOINT, target); } static int vhost_kernel_scsi_clear_endpoint(struct vhost_dev *dev, struct vhost_scsi_target *target) { return vhost_kernel_call(dev, VHOST_SCSI_CLEAR_ENDPOINT, target); } static int vhost_kernel_scsi_get_abi_version(struct vhost_dev *dev, int *version) { return vhost_kernel_call(dev, VHOST_SCSI_GET_ABI_VERSION, version); } static int vhost_kernel_set_log_base(struct vhost_dev *dev, uint64_t base, struct vhost_log *log) { return vhost_kernel_call(dev, VHOST_SET_LOG_BASE, &base); } static int vhost_kernel_set_mem_table(struct vhost_dev *dev, struct vhost_memory *mem) { return vhost_kernel_call(dev, VHOST_SET_MEM_TABLE, mem); } static int vhost_kernel_set_vring_addr(struct vhost_dev *dev, struct vhost_vring_addr *addr) { return vhost_kernel_call(dev, VHOST_SET_VRING_ADDR, addr); } static int vhost_kernel_set_vring_endian(struct vhost_dev *dev, struct vhost_vring_state *ring) { return vhost_kernel_call(dev, VHOST_SET_VRING_ENDIAN, ring); } static int vhost_kernel_set_vring_num(struct vhost_dev *dev, struct vhost_vring_state *ring) { return vhost_kernel_call(dev, VHOST_SET_VRING_NUM, ring); } static int vhost_kernel_set_vring_base(struct vhost_dev *dev, struct vhost_vring_state *ring) { return vhost_kernel_call(dev, VHOST_SET_VRING_BASE, ring); } static int vhost_kernel_get_vring_base(struct vhost_dev *dev, struct vhost_vring_state *ring) { return vhost_kernel_call(dev, VHOST_GET_VRING_BASE, ring); } static int vhost_kernel_set_vring_kick(struct vhost_dev *dev, struct vhost_vring_file *file) { return vhost_kernel_call(dev, VHOST_SET_VRING_KICK, file); } static int vhost_kernel_set_vring_call(struct vhost_dev *dev, struct vhost_vring_file *file) { return vhost_kernel_call(dev, VHOST_SET_VRING_CALL, file); } static int vhost_kernel_set_vring_busyloop_timeout(struct vhost_dev *dev, struct vhost_vring_state *s) { return vhost_kernel_call(dev, VHOST_SET_VRING_BUSYLOOP_TIMEOUT, s); } static int vhost_kernel_set_features(struct vhost_dev *dev, uint64_t features) { return vhost_kernel_call(dev, VHOST_SET_FEATURES, &features); } static int vhost_kernel_get_features(struct vhost_dev *dev, uint64_t *features) { return vhost_kernel_call(dev, VHOST_GET_FEATURES, features); } static int vhost_kernel_set_owner(struct vhost_dev *dev) { return vhost_kernel_call(dev, VHOST_SET_OWNER, NULL); } static int vhost_kernel_reset_device(struct vhost_dev *dev) { return vhost_kernel_call(dev, VHOST_RESET_OWNER, NULL); } static int vhost_kernel_get_vq_index(struct vhost_dev *dev, int idx) { assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs); return idx - dev->vq_index; } #ifdef CONFIG_VHOST_VSOCK static int vhost_kernel_vsock_set_guest_cid(struct vhost_dev *dev, uint64_t guest_cid) { return vhost_kernel_call(dev, VHOST_VSOCK_SET_GUEST_CID, &guest_cid); } static int vhost_kernel_vsock_set_running(struct vhost_dev *dev, int start) { return vhost_kernel_call(dev, VHOST_VSOCK_SET_RUNNING, &start); } #endif /* CONFIG_VHOST_VSOCK */ static void vhost_kernel_iotlb_read(void *opaque) { struct vhost_dev *dev = opaque; struct vhost_msg msg; ssize_t len; while ((len = read((uintptr_t)dev->opaque, &msg, sizeof msg)) > 0) { if (len < sizeof msg) { error_report("Wrong vhost message len: %d", (int)len); break; } if (msg.type != VHOST_IOTLB_MSG) { error_report("Unknown vhost iotlb message type"); break; } vhost_backend_handle_iotlb_msg(dev, &msg.iotlb); } } static int vhost_kernel_send_device_iotlb_msg(struct vhost_dev *dev, struct vhost_iotlb_msg *imsg) { struct vhost_msg msg; msg.type = VHOST_IOTLB_MSG; msg.iotlb = *imsg; if (write((uintptr_t)dev->opaque, &msg, sizeof msg) != sizeof msg) { error_report("Fail to update device iotlb"); return -EFAULT; } return 0; } static void vhost_kernel_set_iotlb_callback(struct vhost_dev *dev, int enabled) { if (enabled) qemu_set_fd_handler((uintptr_t)dev->opaque, vhost_kernel_iotlb_read, NULL, dev); else qemu_set_fd_handler((uintptr_t)dev->opaque, NULL, NULL, NULL); } static const VhostOps kernel_ops = { .backend_type = VHOST_BACKEND_TYPE_KERNEL, .vhost_backend_init = vhost_kernel_init, .vhost_backend_cleanup = vhost_kernel_cleanup, .vhost_backend_memslots_limit = vhost_kernel_memslots_limit, .vhost_net_set_backend = vhost_kernel_net_set_backend, .vhost_scsi_set_endpoint = vhost_kernel_scsi_set_endpoint, .vhost_scsi_clear_endpoint = vhost_kernel_scsi_clear_endpoint, .vhost_scsi_get_abi_version = vhost_kernel_scsi_get_abi_version, .vhost_set_log_base = vhost_kernel_set_log_base, .vhost_set_mem_table = vhost_kernel_set_mem_table, .vhost_set_vring_addr = vhost_kernel_set_vring_addr, .vhost_set_vring_endian = vhost_kernel_set_vring_endian, .vhost_set_vring_num = vhost_kernel_set_vring_num, .vhost_set_vring_base = vhost_kernel_set_vring_base, .vhost_get_vring_base = vhost_kernel_get_vring_base, .vhost_set_vring_kick = vhost_kernel_set_vring_kick, .vhost_set_vring_call = vhost_kernel_set_vring_call, .vhost_set_vring_busyloop_timeout = vhost_kernel_set_vring_busyloop_timeout, .vhost_set_features = vhost_kernel_set_features, .vhost_get_features = vhost_kernel_get_features, .vhost_set_owner = vhost_kernel_set_owner, .vhost_reset_device = vhost_kernel_reset_device, .vhost_get_vq_index = vhost_kernel_get_vq_index, #ifdef CONFIG_VHOST_VSOCK .vhost_vsock_set_guest_cid = vhost_kernel_vsock_set_guest_cid, .vhost_vsock_set_running = vhost_kernel_vsock_set_running, #endif /* CONFIG_VHOST_VSOCK */ .vhost_set_iotlb_callback = vhost_kernel_set_iotlb_callback, .vhost_send_device_iotlb_msg = vhost_kernel_send_device_iotlb_msg, }; int vhost_set_backend_type(struct vhost_dev *dev, VhostBackendType backend_type) { int r = 0; switch (backend_type) { case VHOST_BACKEND_TYPE_KERNEL: dev->vhost_ops = &kernel_ops; break; case VHOST_BACKEND_TYPE_USER: dev->vhost_ops = &user_ops; break; default: error_report("Unknown vhost backend type"); r = -1; } return r; } int vhost_backend_update_device_iotlb(struct vhost_dev *dev, uint64_t iova, uint64_t uaddr, uint64_t len, IOMMUAccessFlags perm) { struct vhost_iotlb_msg imsg; imsg.iova = iova; imsg.uaddr = uaddr; imsg.size = len; imsg.type = VHOST_IOTLB_UPDATE; switch (perm) { case IOMMU_RO: imsg.perm = VHOST_ACCESS_RO; break; case IOMMU_WO: imsg.perm = VHOST_ACCESS_WO; break; case IOMMU_RW: imsg.perm = VHOST_ACCESS_RW; break; default: return -EINVAL; } if (dev->vhost_ops && dev->vhost_ops->vhost_send_device_iotlb_msg) return dev->vhost_ops->vhost_send_device_iotlb_msg(dev, &imsg); return -ENODEV; } int vhost_backend_invalidate_device_iotlb(struct vhost_dev *dev, uint64_t iova, uint64_t len) { struct vhost_iotlb_msg imsg; imsg.iova = iova; imsg.size = len; imsg.type = VHOST_IOTLB_INVALIDATE; if (dev->vhost_ops && dev->vhost_ops->vhost_send_device_iotlb_msg) return dev->vhost_ops->vhost_send_device_iotlb_msg(dev, &imsg); return -ENODEV; } int vhost_backend_handle_iotlb_msg(struct vhost_dev *dev, struct vhost_iotlb_msg *imsg) { int ret = 0; switch (imsg->type) { case VHOST_IOTLB_MISS: ret = vhost_device_iotlb_miss(dev, imsg->iova, imsg->perm != VHOST_ACCESS_RO); break; case VHOST_IOTLB_ACCESS_FAIL: /* FIXME: report device iotlb error */ error_report("Access failure IOTLB message type not supported"); ret = -ENOTSUP; break; case VHOST_IOTLB_UPDATE: case VHOST_IOTLB_INVALIDATE: default: error_report("Unexpected IOTLB message type"); ret = -EINVAL; break; } return ret; }