From 72bd0b175b0433cd8e02fc84da78452f80a53cd4 Mon Sep 17 00:00:00 2001
From: Benjamin Gilbert <bgilbert@redhat.com>
Date: Tue, 15 May 2018 17:22:24 -0400
Subject: [PATCH] build_library: attach virtio-rng-pci device to QEMU VMs

Pass /dev/urandom through to QEMU VMs. (Not /dev/random, to avoid
draining the host's entropy.) This speeds initialization of VM entropy.
---
 build_library/qemu_template.sh | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/build_library/qemu_template.sh b/build_library/qemu_template.sh
index b846b4f4c4..2a4bee4f7d 100755
--- a/build_library/qemu_template.sh
+++ b/build_library/qemu_template.sh
@@ -220,6 +220,7 @@ case "${VM_BOARD}" in
             -m ${VM_MEMORY} \
             -net nic,vlan=0,model=virtio \
             -net user,vlan=0,hostfwd=tcp::"${SSH_PORT}"-:22,hostname="${VM_NAME}" \
+            -object rng-random,filename=/dev/urandom,id=rng0 -device virtio-rng-pci,rng=rng0 \
             "$@"
         ;;
     arm64-usr)
@@ -228,6 +229,7 @@ case "${VM_BOARD}" in
             -m ${VM_MEMORY} \
             -netdev user,id=eth0,hostfwd=tcp::"${SSH_PORT}"-:22,hostname="${VM_NAME}" \
             -device virtio-net-device,netdev=eth0 \
+            -object rng-random,filename=/dev/urandom,id=rng0 -device virtio-rng-pci,rng=rng0 \
             "$@"
         ;;
     *) die "Unsupported arch" ;;