virtio: An entropy device, as suggested by hpa.

Note that by itself, having a "hardware" random generator does very
little: you should probably run "rngd" in your guest to feed this into
the kernel entropy pool.

Included:
	virtio_rng: dont use vmalloced addresses for virtio

	If virtio_rng is build as a module, random_data is an address
	in vmalloc space. As virtio expects guest real addresses, this
	can cause any kind of funny behaviour, so lets allocate
	random_data dynamically with kmalloc.

	Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 155 insertions, 0 deletions

diff --git a/drivers/char/hw_random/virtio-rng.c b/drivers/char/hw_random/virtio-rng.c
new file mode 100644
index 000000000000..d0e563e4fc39
--- /dev/null
+++ b/drivers/char/hw_random/virtio-rng.c
@@ -0,0 +1,155 @@
+/*
+ * Randomness driver for virtio
+ *  Copyright (C) 2007, 2008 Rusty Russell IBM Corporation
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+#include <linux/err.h>
+#include <linux/hw_random.h>
+#include <linux/scatterlist.h>
+#include <linux/spinlock.h>
+#include <linux/virtio.h>
+#include <linux/virtio_rng.h>
+
+/* The host will fill any buffer we give it with sweet, sweet randomness.  We
+ * give it 64 bytes at a time, and the hwrng framework takes it 4 bytes at a
+ * time. */
+#define RANDOM_DATA_SIZE 64
+
+static struct virtqueue *vq;
+static u32 *random_data;
+static unsigned int data_left;
+static DECLARE_COMPLETION(have_data);
+
+static void random_recv_done(struct virtqueue *vq)
+{
+        int len;
+
+        /* We never get spurious callbacks. */
+        if (!vq->vq_ops->get_buf(vq, &len))
+                BUG();
+
+        data_left = len / sizeof(random_data[0]);
+        complete(&have_data);
+}
+
+static void register_buffer(void)
+{
+        struct scatterlist sg;
+
+        sg_init_one(&sg, random_data, RANDOM_DATA_SIZE);
+        /* There should always be room for one buffer. */
+        if (vq->vq_ops->add_buf(vq, &sg, 0, 1, random_data) != 0)
+                BUG();
+        vq->vq_ops->kick(vq);
+}
+
+/* At least we don't udelay() in a loop like some other drivers. */
+static int virtio_data_present(struct hwrng *rng, int wait)
+{
+        if (data_left)
+                return 1;
+
+        if (!wait)
+                return 0;
+
+        wait_for_completion(&have_data);
+        return 1;
+}
+
+/* virtio_data_present() must have succeeded before this is called. */
+static int virtio_data_read(struct hwrng *rng, u32 *data)
+{
+        BUG_ON(!data_left);
+
+        *data = random_data[--data_left];
+
+        if (!data_left) {
+                init_completion(&have_data);
+                register_buffer();
+        }
+        return sizeof(*data);
+}
+
+static struct hwrng virtio_hwrng = {
+        .name = "virtio",
+        .data_present = virtio_data_present,
+        .data_read = virtio_data_read,
+};
+
+static int virtrng_probe(struct virtio_device *vdev)
+{
+        int err;
+
+        /* We expect a single virtqueue. */
+        vq = vdev->config->find_vq(vdev, 0, random_recv_done);
+        if (IS_ERR(vq))
+                return PTR_ERR(vq);
+
+        err = hwrng_register(&virtio_hwrng);
+        if (err) {
+                vdev->config->del_vq(vq);
+                return err;
+        }
+
+        register_buffer();
+        return 0;
+}
+
+static void virtrng_remove(struct virtio_device *vdev)
+{
+        vdev->config->reset(vdev);
+        hwrng_unregister(&virtio_hwrng);
+        vdev->config->del_vq(vq);
+}
+
+static struct virtio_device_id id_table[] = {
+        { VIRTIO_ID_RNG, VIRTIO_DEV_ANY_ID },
+        { 0 },
+};
+
+static struct virtio_driver virtio_rng = {
+        .driver.name =  KBUILD_MODNAME,
+        .driver.owner = THIS_MODULE,
+        .id_table =     id_table,
+        .probe =        virtrng_probe,
+        .remove =       __devexit_p(virtrng_remove),
+};
+
+static int __init init(void)
+{
+        int err;
+
+        random_data = kmalloc(RANDOM_DATA_SIZE, GFP_KERNEL);
+        if (!random_data)
+                return -ENOMEM;
+
+        err = register_virtio_driver(&virtio_rng);
+        if (err)
+                kfree(random_data);
+        return err;
+}
+
+static void __exit fini(void)
+{
+        kfree(random_data);
+        unregister_virtio_driver(&virtio_rng);
+}
+module_init(init);
+module_exit(fini);
+
+MODULE_DEVICE_TABLE(virtio, id_table);
+MODULE_DESCRIPTION("Virtio random number driver");
+MODULE_LICENSE("GPL");