Added support for qemu-kvm and bridged networking

Makefile

-all:
+all: bridge-netdev
 	dd if=/dev/zero of=swap bs=1048576 count=1024
 	chmod 600 swap
 	mkswap swap
@@ -11,5 +11,17 @@ all:
 	$(MAKE) -C qemu-3.1.0 install
 	rm -rf qemu-3.1.0
 
+	install -v -m755 qemu-kvm /usr/bin/qemu-kvm
+
 	swapoff swap
 	rm -rf swap
+
+	echo "$$BRIDGE_NETDEV" > /etc/systemd/network/br0.netdev
+
+bridge-netdev:
+define BRIDGE_NETDEV
+[NetDev]
+Name=br0
+Kind=bridge
+endef
+export BRIDGE_NETDEV

qemu-kvm

+#!/bin/sh
+
+# Libvirt introspects the binary using -M none. In that case, don't try
+# to init KVM, which will fail and be noisy if the host has kvm disabled
+opts="-machine accel=kvm"
+if echo "$@" | grep -q " -M none "; then
+    opts=
+fi
+
+exec /usr/bin/qemu-system-x86_64 $opts "$@"