1 /* 2 * vhost-backend 3 * 4 * Copyright (c) 2013 Virtual Open Systems Sarl. 5 * 6 * This work is licensed under the terms of the GNU GPL, version 2 or later. 7 * See the COPYING file in the top-level directory. 8 * 9 */ 10 11 #include "hw/virtio/vhost.h" 12 #include "hw/virtio/vhost-backend.h" 13 #include "qemu/error-report.h" 14 15 #include <sys/ioctl.h> 16 17 static int vhost_kernel_call(struct vhost_dev *dev, unsigned long int request, 18 void *arg) 19 { 20 int fd = (uintptr_t) dev->opaque; 21 22 assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_KERNEL); 23 24 return ioctl(fd, request, arg); 25 } 26 27 static int vhost_kernel_init(struct vhost_dev *dev, void *opaque) 28 { 29 assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_KERNEL); 30 31 dev->opaque = opaque; 32 33 return 0; 34 } 35 36 static int vhost_kernel_cleanup(struct vhost_dev *dev) 37 { 38 int fd = (uintptr_t) dev->opaque; 39 40 assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_KERNEL); 41 42 return close(fd); 43 } 44 45 static const VhostOps kernel_ops = { 46 .backend_type = VHOST_BACKEND_TYPE_KERNEL, 47 .vhost_call = vhost_kernel_call, 48 .vhost_backend_init = vhost_kernel_init, 49 .vhost_backend_cleanup = vhost_kernel_cleanup 50 }; 51 52 int vhost_set_backend_type(struct vhost_dev *dev, VhostBackendType backend_type) 53 { 54 int r = 0; 55 56 switch (backend_type) { 57 case VHOST_BACKEND_TYPE_KERNEL: 58 dev->vhost_ops = &kernel_ops; 59 break; 60 case VHOST_BACKEND_TYPE_USER: 61 dev->vhost_ops = &user_ops; 62 break; 63 default: 64 error_report("Unknown vhost backend type"); 65 r = -1; 66 } 67 68 return r; 69 } 70