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-rw-r--r--qemu/hw/virtio/vhost-backend.c69
1 files changed, 69 insertions, 0 deletions
diff --git a/qemu/hw/virtio/vhost-backend.c b/qemu/hw/virtio/vhost-backend.c
new file mode 100644
index 000000000..4d68a2765
--- /dev/null
+++ b/qemu/hw/virtio/vhost-backend.c
@@ -0,0 +1,69 @@
+/*
+ * 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");
+ r = -1;
+ }
+
+ return r;
+}