I'm wondering if Realm Management Monitor (RMM -- a hypervisor for Realm VM in Armv9) could read and write to Realm VM's data.
There are interfaces between the RMM and Realm VM, which are mainly Realm Services Interface (RSI) and some power managment related interface. The specs (p.21~22, Section A1.3) for the RSI tells me that it would not be able to check Realm VM's data -- could anyone confirm that I'm being correct?Otherwise, would RMM have some channel to Realm VM for read and write operations?
Thanks in advance!
No, it doesn't.
The RMM at R-EL2 can both read and write any memory with Realm PAS.