Hi All, I am trying to understand the approach required for an emulated SMMU to convert IPAs(from each qemu guest) to PAs(respective host addresses) using stage 2 tables.
The questions i have are:- 1) Since SMMU stage 2 tables are expected to be created and managed by a hypervisor,if there is no kvm support,who is responsible to create the stage 2 tables in host memory? is it even a valid use case to consider smmu stage 2 support with no hypervisor present? 2) with SMMU emulated by qemu:- a) who is responsible for hosting and programming the stage 2 table base address registers? b) what are the APIs available in qemu to access the stage 2 tables? (will address_space_ API variants apply here?) 3) if each qemu instance (for a guest) emulates an SMMU,will there be a need to protect concurrent access of stage 2 table(in host) by each of the SMMUs? Thanks Shashi
