To build an automotive/embedded/android platform that involves the Xen Project Hypervisor a number of challenges need to be resolved.
Other co-processor (DSP, IPU, etc.)
Driver support for Android, e.g. Backend ION memory allocator and Linux User Space Device Drivers for Graphics, Sound, USB, Giros, GPS, etc.
Driver support for operating systems such as QNX and other guest operating systems that are relevant for these use-cases