Commit 34679ec7 authored by Amit Shah's avatar Amit Shah

virtio: rng: add derating factor for use by hwrng core

The khwrngd thread is started when a hwrng device of sufficient
quality is registered.  The virtio-rng device is backed by the
hypervisor, and we trust the hypervisor to provide real entropy.

A malicious or badly-implemented hypervisor is a scenario that's
irrelevant -- such a setup is bound to cause all sorts of badness, and a
compromised hwrng is the least of the user's worries.

Given this, we might as well assume that the quality of randomness we
receive is perfectly trustworthy.  Hence, we use 100% for the factor,
indicating maximum confidence in the source.
Signed-off-by: default avatarAmit Shah <amit.shah@redhat.com>
Reviewed-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
Reviewed-by: default avatarAmos Kong <akong@redhat.com>
Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
parent c9d26423
...@@ -116,6 +116,7 @@ static int probe_common(struct virtio_device *vdev) ...@@ -116,6 +116,7 @@ static int probe_common(struct virtio_device *vdev)
.cleanup = virtio_cleanup, .cleanup = virtio_cleanup,
.priv = (unsigned long)vi, .priv = (unsigned long)vi,
.name = vi->name, .name = vi->name,
.quality = 1000,
}; };
vdev->priv = vi; vdev->priv = vi;
......
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