linux-kernel - [PATCH 1/2] rngd: add udev rule to source from hwrng if virtio-rng present

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Date:	Thu,  7 Aug 2014 18:38:59 +0530
From:	Amit Shah <amit.shah@...hat.com>
To:	jgarzik@...pay.com
Cc:	hpa@...ux.intel.com,
	Virtualization List <virtualization@...ts.linux-foundation.org>,
	Amos Kong <akong@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org, Amit Shah <amit.shah@...hat.com>
Subject: [PATCH 1/2] rngd: add udev rule to source from hwrng if virtio-rng present

On KVM guests where the virtio-rng device is available, and set as the
current rng, this udev rule will start rngd which will feed in the
host-provided entropy to /dev/random.

Signed-off-by: Amit Shah <amit.shah@...hat.com>
---
 90-virtio-rng.rules | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 90-virtio-rng.rules

diff --git a/90-virtio-rng.rules b/90-virtio-rng.rules
new file mode 100644
index 0000000..07f2f9c
--- /dev/null
+++ b/90-virtio-rng.rules
@@ -0,0 +1 @@
+KERNEL=="hw_random", ATTR{rng_current}=="virtio*", RUN+="/sbin/rngd -r /dev/hwrng"
-- 
1.9.3

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