SUBSYSTEM!="dmi", GOTO="product_uuid-exit"
ATTR{sys_vendor}!="Microsoft Corporation", GOTO="product_uuid-exit"
ATTR{product_name}!="Virtual Machine", GOTO="product_uuid-exit"
TEST!="/sys/devices/virtual/dmi/id/product_uuid", GOTO="product_uuid-exit"

RUN+="/bin/chmod 0444 /sys/devices/virtual/dmi/id/product_uuid"

LABEL="product_uuid-exit"