run_qemu.sh: let qemu autodetect if kvm is available and fall back to tcg

run_qemu.sh

@@ -27,13 +27,9 @@ trap cleanup INT TERM EXIT
 # the path to debian-$DEFAULT_DIST.qcow must be absolute or otherwise qemu will
 # look for the path relative to debian-$DEFAULT_DIST-overlay.qcow
 qemu-img create -f qcow2 -b "$(realpath $cachedir)/debian-$DEFAULT_DIST.qcow" "$tmpdir/debian-$DEFAULT_DIST-overlay.qcow"
-KVM=
-if [ -e /dev/kvm ]; then
-	KVM="-enable-kvm"
-fi
 # to connect to serial use:
 #   minicom -D 'unix#/tmp/ttyS0'
-qemu-system-x86_64 $KVM -m 1G -nographic \
+qemu-system-x86_64 -M accel=kvm:tcg -m 1G -nographic \
 	-monitor unix:/tmp/monitor,server,nowait \
 	-serial unix:/tmp/ttyS0,server,nowait \
 	-serial unix:/tmp/ttyS1,server,nowait \