esx tcp xenmigr xen linux hvm exe uml 31 32 64 qemu kqemu kvm xen uml lxc openvz test yes no on off arm i686 ia64 microblaze microblazeel mips mipsel ppc64 ppc s390 sparc x86_64 [0-9]+ [0-9]+ /[a-zA-Z0-9_\+\-/%]+ [a-zA-Z0-9\-_]+ [a-fA-F0-9]{32} [a-fA-F0-9]{8}\-([a-fA-F0-9]{4}\-){3}[a-fA-F0-9]{12}