vm.run: use -cpu host

slapos/recipe/vm.py

@@ -423,8 +423,9 @@ cd /etc/sudoers.d
           s.bind(('127.0.0.1', 0))
           ssh = s.getsockname()
           args = self.getQemuBasicArgs(
-            options['dist'], snapshot=True, ssh=ssh[1]) + [
-            '-vnc', 'unix:' + vnc] + mount_args
+            options['dist'], snapshot=True, ssh=ssh[1])
+          args += '-cpu', 'host', '-vnc', 'unix:' + vnc
+          args += mount_args
           s.close()
           qemu = Popen(args, stderr=subprocess.PIPE, env=dict(env,
             TMPDIR=location, # for snapshot