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@@ -0,0 +1,320 @@
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+/* Copyright (C) 2009 Red Hat, Inc.
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+ * Author: Michael S. Tsirkin <mst@redhat.com>
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+ *
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+ * This work is licensed under the terms of the GNU GPL, version 2.
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+ *
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+ * test virtio server in host kernel.
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+ */
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+
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+#include <linux/compat.h>
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+#include <linux/eventfd.h>
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+#include <linux/vhost.h>
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+#include <linux/miscdevice.h>
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+#include <linux/module.h>
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+#include <linux/mutex.h>
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+#include <linux/workqueue.h>
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+#include <linux/rcupdate.h>
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+#include <linux/file.h>
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+#include <linux/slab.h>
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+
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+#include "test.h"
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+#include "vhost.c"
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+
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+/* Max number of bytes transferred before requeueing the job.
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+ * Using this limit prevents one virtqueue from starving others. */
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+#define VHOST_TEST_WEIGHT 0x80000
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+
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+enum {
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+ VHOST_TEST_VQ = 0,
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+ VHOST_TEST_VQ_MAX = 1,
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+};
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+
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+struct vhost_test {
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+ struct vhost_dev dev;
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+ struct vhost_virtqueue vqs[VHOST_TEST_VQ_MAX];
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+};
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+
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+/* Expects to be always run from workqueue - which acts as
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+ * read-size critical section for our kind of RCU. */
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+static void handle_vq(struct vhost_test *n)
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+{
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+ struct vhost_virtqueue *vq = &n->dev.vqs[VHOST_TEST_VQ];
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+ unsigned out, in;
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+ int head;
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+ size_t len, total_len = 0;
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+ void *private;
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+
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+ private = rcu_dereference_check(vq->private_data, 1);
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+ if (!private)
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+ return;
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+
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+ mutex_lock(&vq->mutex);
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+ vhost_disable_notify(vq);
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+
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+ for (;;) {
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+ head = vhost_get_vq_desc(&n->dev, vq, vq->iov,
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+ ARRAY_SIZE(vq->iov),
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+ &out, &in,
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+ NULL, NULL);
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+ /* On error, stop handling until the next kick. */
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+ if (unlikely(head < 0))
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+ break;
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+ /* Nothing new? Wait for eventfd to tell us they refilled. */
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+ if (head == vq->num) {
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+ if (unlikely(vhost_enable_notify(vq))) {
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+ vhost_disable_notify(vq);
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+ continue;
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+ }
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+ break;
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+ }
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+ if (in) {
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+ vq_err(vq, "Unexpected descriptor format for TX: "
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+ "out %d, int %d\n", out, in);
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+ break;
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+ }
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+ len = iov_length(vq->iov, out);
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+ /* Sanity check */
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+ if (!len) {
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+ vq_err(vq, "Unexpected 0 len for TX\n");
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+ break;
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+ }
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+ vhost_add_used_and_signal(&n->dev, vq, head, 0);
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+ total_len += len;
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+ if (unlikely(total_len >= VHOST_TEST_WEIGHT)) {
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+ vhost_poll_queue(&vq->poll);
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+ break;
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+ }
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+ }
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+
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+ mutex_unlock(&vq->mutex);
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+}
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+
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+static void handle_vq_kick(struct vhost_work *work)
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+{
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+ struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
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+ poll.work);
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+ struct vhost_test *n = container_of(vq->dev, struct vhost_test, dev);
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+
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+ handle_vq(n);
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+}
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+
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+static int vhost_test_open(struct inode *inode, struct file *f)
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+{
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+ struct vhost_test *n = kmalloc(sizeof *n, GFP_KERNEL);
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+ struct vhost_dev *dev;
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+ int r;
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+
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+ if (!n)
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+ return -ENOMEM;
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+
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+ dev = &n->dev;
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+ n->vqs[VHOST_TEST_VQ].handle_kick = handle_vq_kick;
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+ r = vhost_dev_init(dev, n->vqs, VHOST_TEST_VQ_MAX);
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+ if (r < 0) {
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+ kfree(n);
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+ return r;
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+ }
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+
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+ f->private_data = n;
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+
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+ return 0;
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+}
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+
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+static void *vhost_test_stop_vq(struct vhost_test *n,
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+ struct vhost_virtqueue *vq)
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+{
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+ void *private;
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+
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+ mutex_lock(&vq->mutex);
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+ private = rcu_dereference_protected(vq->private_data,
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+ lockdep_is_held(&vq->mutex));
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+ rcu_assign_pointer(vq->private_data, NULL);
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+ mutex_unlock(&vq->mutex);
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+ return private;
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+}
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+
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+static void vhost_test_stop(struct vhost_test *n, void **privatep)
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+{
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+ *privatep = vhost_test_stop_vq(n, n->vqs + VHOST_TEST_VQ);
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+}
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+
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+static void vhost_test_flush_vq(struct vhost_test *n, int index)
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+{
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+ vhost_poll_flush(&n->dev.vqs[index].poll);
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+}
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+
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+static void vhost_test_flush(struct vhost_test *n)
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+{
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+ vhost_test_flush_vq(n, VHOST_TEST_VQ);
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+}
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+
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+static int vhost_test_release(struct inode *inode, struct file *f)
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+{
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+ struct vhost_test *n = f->private_data;
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+ void *private;
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+
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+ vhost_test_stop(n, &private);
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+ vhost_test_flush(n);
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+ vhost_dev_cleanup(&n->dev);
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+ /* We do an extra flush before freeing memory,
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+ * since jobs can re-queue themselves. */
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+ vhost_test_flush(n);
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+ kfree(n);
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+ return 0;
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+}
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+
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+static long vhost_test_run(struct vhost_test *n, int test)
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+{
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+ void *priv, *oldpriv;
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+ struct vhost_virtqueue *vq;
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+ int r, index;
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+
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+ if (test < 0 || test > 1)
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+ return -EINVAL;
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+
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+ mutex_lock(&n->dev.mutex);
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+ r = vhost_dev_check_owner(&n->dev);
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+ if (r)
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+ goto err;
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+
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+ for (index = 0; index < n->dev.nvqs; ++index) {
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+ /* Verify that ring has been setup correctly. */
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+ if (!vhost_vq_access_ok(&n->vqs[index])) {
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+ r = -EFAULT;
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+ goto err;
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+ }
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+ }
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+
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+ for (index = 0; index < n->dev.nvqs; ++index) {
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+ vq = n->vqs + index;
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+ mutex_lock(&vq->mutex);
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+ priv = test ? n : NULL;
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+
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+ /* start polling new socket */
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+ oldpriv = rcu_dereference_protected(vq->private_data,
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+ lockdep_is_held(&vq->mutex));
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+ rcu_assign_pointer(vq->private_data, priv);
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+
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+ mutex_unlock(&vq->mutex);
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+
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+ if (oldpriv) {
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+ vhost_test_flush_vq(n, index);
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+ }
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+ }
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+
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+ mutex_unlock(&n->dev.mutex);
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+ return 0;
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+
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+err:
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+ mutex_unlock(&n->dev.mutex);
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+ return r;
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+}
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+
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+static long vhost_test_reset_owner(struct vhost_test *n)
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+{
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+ void *priv = NULL;
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+ long err;
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+ mutex_lock(&n->dev.mutex);
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+ err = vhost_dev_check_owner(&n->dev);
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+ if (err)
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+ goto done;
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+ vhost_test_stop(n, &priv);
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+ vhost_test_flush(n);
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+ err = vhost_dev_reset_owner(&n->dev);
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+done:
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+ mutex_unlock(&n->dev.mutex);
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+ return err;
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+}
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+
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+static int vhost_test_set_features(struct vhost_test *n, u64 features)
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+{
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+ mutex_lock(&n->dev.mutex);
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+ if ((features & (1 << VHOST_F_LOG_ALL)) &&
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+ !vhost_log_access_ok(&n->dev)) {
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+ mutex_unlock(&n->dev.mutex);
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+ return -EFAULT;
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+ }
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+ n->dev.acked_features = features;
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+ smp_wmb();
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+ vhost_test_flush(n);
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+ mutex_unlock(&n->dev.mutex);
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+ return 0;
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+}
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+
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+static long vhost_test_ioctl(struct file *f, unsigned int ioctl,
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+ unsigned long arg)
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+{
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+ struct vhost_test *n = f->private_data;
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+ void __user *argp = (void __user *)arg;
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+ u64 __user *featurep = argp;
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+ int test;
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+ u64 features;
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+ int r;
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+ switch (ioctl) {
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+ case VHOST_TEST_RUN:
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+ if (copy_from_user(&test, argp, sizeof test))
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+ return -EFAULT;
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+ return vhost_test_run(n, test);
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+ case VHOST_GET_FEATURES:
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+ features = VHOST_FEATURES;
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+ if (copy_to_user(featurep, &features, sizeof features))
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+ return -EFAULT;
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+ return 0;
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+ case VHOST_SET_FEATURES:
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+ if (copy_from_user(&features, featurep, sizeof features))
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+ return -EFAULT;
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+ if (features & ~VHOST_FEATURES)
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+ return -EOPNOTSUPP;
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+ return vhost_test_set_features(n, features);
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+ case VHOST_RESET_OWNER:
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+ return vhost_test_reset_owner(n);
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+ default:
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+ mutex_lock(&n->dev.mutex);
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+ r = vhost_dev_ioctl(&n->dev, ioctl, arg);
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+ vhost_test_flush(n);
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+ mutex_unlock(&n->dev.mutex);
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+ return r;
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+ }
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+}
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+
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+#ifdef CONFIG_COMPAT
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+static long vhost_test_compat_ioctl(struct file *f, unsigned int ioctl,
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+ unsigned long arg)
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+{
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+ return vhost_test_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
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+}
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+#endif
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+
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+static const struct file_operations vhost_test_fops = {
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+ .owner = THIS_MODULE,
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+ .release = vhost_test_release,
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+ .unlocked_ioctl = vhost_test_ioctl,
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+#ifdef CONFIG_COMPAT
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+ .compat_ioctl = vhost_test_compat_ioctl,
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+#endif
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+ .open = vhost_test_open,
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+ .llseek = noop_llseek,
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+};
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+
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+static struct miscdevice vhost_test_misc = {
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+ MISC_DYNAMIC_MINOR,
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+ "vhost-test",
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+ &vhost_test_fops,
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+};
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+
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+static int vhost_test_init(void)
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+{
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+ return misc_register(&vhost_test_misc);
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+}
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+module_init(vhost_test_init);
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+
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+static void vhost_test_exit(void)
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+{
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+ misc_deregister(&vhost_test_misc);
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+}
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+module_exit(vhost_test_exit);
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+
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+MODULE_VERSION("0.0.1");
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+MODULE_LICENSE("GPL v2");
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+MODULE_AUTHOR("Michael S. Tsirkin");
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+MODULE_DESCRIPTION("Host kernel side for virtio simulator");
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David S. Miller