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virtio-rng: hardware random number generator device

Browse source 
The Linux kernel already has a virtio-rng driver, this is the device
implementation.

When the guest asks for entropy from the virtio hwrng, it puts a buffer
in the vq.  We then put entropy into that buffer, and push it back to
the guest.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---
aliguori: converted to new RngBackend interface
aliguori: remove entropy needed event
aliguori: fix migration
This commit is contained in:
Amit Shah 2012-06-20 12:29:32 +05:30 • committed by Anthony Liguori
parent 1da2738f55
commit 16c915ba42
9 changed files with 341 additions and 0 deletions
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37
hw/s390-virtio-bus.c
View file

@ -26,6 +26,7 @@
#include "loader.h"
#include "elf.h"
#include "hw/virtio.h"
#include "hw/virtio-rng.h"
#include "hw/virtio-serial.h"
#include "hw/virtio-net.h"
#include "hw/sysbus.h"
@ -206,6 +207,18 @@ static int s390_virtio_scsi_init(VirtIOS390Device *dev)
return s390_virtio_device_init(dev, vdev);
}
static int s390_virtio_rng_init(VirtIOS390Device *dev)
{
VirtIODevice *vdev;
vdev = virtio_rng_init((DeviceState *)dev, &dev->rng);
if (!vdev) {
return -1;
}
return s390_virtio_device_init(dev, vdev);
}
static uint64_t s390_virtio_device_vq_token(VirtIOS390Device *dev, int vq)
{
ram_addr_t token_off;
@ -448,6 +461,29 @@ static TypeInfo s390_virtio_serial = {
.class_init = s390_virtio_serial_class_init,
};
static void s390_virtio_rng_initfn(Object *obj)
{
VirtIOS390Device *dev = VIRTIO_S390_DEVICE(obj);
object_property_add_link(obj, "rng", TYPE_RNG_BACKEND,
(Object **)&dev->rng.rng, NULL);
}
static void s390_virtio_rng_class_init(ObjectClass *klass, void *data)
{
VirtIOS390DeviceClass *k = VIRTIO_S390_DEVICE_CLASS(klass);
k->init = s390_virtio_rng_init;
}
static TypeInfo s390_virtio_rng = {
.name = "virtio-rng-s390",
.parent = TYPE_VIRTIO_S390_DEVICE,
.instance_size = sizeof(VirtIOS390Device),
.instance_init = s390_virtio_rng_initfn,
.class_init = s390_virtio_rng_class_init,
};
static int s390_virtio_busdev_init(DeviceState *dev)
{
VirtIOS390Device *_dev = (VirtIOS390Device *)dev;
@ -528,6 +564,7 @@ static void s390_virtio_register_types(void)
type_register_static(&s390_virtio_blk);
type_register_static(&s390_virtio_net);
type_register_static(&s390_virtio_scsi);
type_register_static(&s390_virtio_rng);
type_register_static(&s390_virtio_bridge_info);
}