From e809667b171da294dc4e9ce98f0901cd33210835 Mon Sep 17 00:00:00 2001
From: Maarten Hoogendoorn <maarten@moretea.nl>
Date: Wed, 27 Jul 2016 11:29:18 +0200
Subject: [PATCH] vmTools.runInLinuxImage: add virtio_rng device

This allows the QEMU VM's to use the /dev/random device, by
getting entropy from the host.
---
 pkgs/build-support/vm/default.nix | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pkgs/build-support/vm/default.nix b/pkgs/build-support/vm/default.nix
index fa7107bd738..7ac1b2cc519 100644
--- a/pkgs/build-support/vm/default.nix
+++ b/pkgs/build-support/vm/default.nix
@@ -2,7 +2,7 @@
 , kernel ? pkgs.linux
 , img ? "bzImage"
 , rootModules ?
-    [ "virtio_pci" "virtio_blk" "virtio_balloon" "ext4" "unix" "9p" "9pnet_virtio" "rtc_cmos" ]
+    [ "virtio_pci" "virtio_blk" "virtio_balloon" "virtio_rng" "ext4" "unix" "9p" "9pnet_virtio" "rtc_cmos" ]
 }:
 
 with pkgs;
@@ -218,6 +218,7 @@ rec {
     ${qemuProg} \
       ${lib.optionalString (pkgs.stdenv.system == "x86_64-linux") "-cpu kvm64"} \
       -nographic -no-reboot \
+      -device virtio-rng-pci \
       -virtfs local,path=/nix/store,security_model=none,mount_tag=store \
       -virtfs local,path=$TMPDIR/xchg,security_model=none,mount_tag=xchg \
       -drive file=$diskImage,if=virtio,cache=unsafe,werror=report \