I'm doing some development based on PV-on-HVM source.Have modified the code in unmodified_drivers, When I map one HVM domU memory page to another domU by HYPERVISOR_grant_table_op, it returns an error code "-38"(function no implement), in another way, one HVM domU can't map another's menory page.

    I wonder wheather you can give me a hand about this problem. Or some valuable advice.

Thanks in advance.