| /* |
| * 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 "hw/virtio/vhost.h" |
| #include "hw/virtio/vhost-backend.h" |
| #include "qemu/error-report.h" |
| |
| #include <sys/ioctl.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 const VhostOps kernel_ops = { |
| .backend_type = VHOST_BACKEND_TYPE_KERNEL, |
| .vhost_call = vhost_kernel_call, |
| .vhost_backend_init = vhost_kernel_init, |
| .vhost_backend_cleanup = vhost_kernel_cleanup |
| }; |
| |
| 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\n"); |
| r = -1; |
| } |
| |
| return r; |
| } |