Description of problem:
qemu-kvm quit when get data from rng device in guest(RHEL6.5) after wakeup from S4.

Version-Release number of selected component (if applicable):
qemu: qemu-kvm-rhev-1.5.3-3.el7.x86_64
guest kernel: 2.6.32-419.el6.i686

How reproducible:
100%

Steps to Reproduce:
1.boot guest with rng-edg
# cat /dev/random | nc -l localhost 1024

#/usr/libexec/qemu-kvm ...
-chardev socket,host=localhost,port=1024,id=chr0 \
-object rng-egd,chardev=chr0,id=rng0 \
-device virtio-rng-pci,rng=rng0


2.do S4 on guest
#echo disk > /sys/power/state

3.wakeup guest and get data from rng device
#cat /dev/hwrng

Actual results:
after 3
hmp report 'qemu-kvm: virtio: trying to map MMIO memory' and qemu-kvm quit.

Expected results:


Additional info:
RHEL7 guest not hit this issue.