Access to mapped memory

[boborjan2]

I have two questions regarding mapped memory handling:

1. I see there is a database uc_engine->mapped_blocks that contains all user mapped memory (not mmio), specified by uc_mem_map_ptr. This is seemingly used only for checking for memory overlap when mapping new blocks. For converting physical address to MemoryRegion, however, uc->memory_mapping() is used that performs a much more complicated lookup to get the corresponfing mr.
   Why is that? These are all physicial memory blocks, they do not change after mapping(?). What am I missing?
   Can I use the mapped_blocks only (or similar uplevel structure) to convert a physical address to a memory region (in case I have no mmio)?

2. Injecting data to physical memory: user is supposed to write guest memory via uc_mem_write(). This finds the memory regions affected and performs the actual write. In cases when it is known that a target area is inside a given mr and the host memory is allocated by the user, may the user write guest memory via simple write to the allocated blob (e.g. from a hook), like a DMA would?
   If not, what else shall be done after such a memory write to make emulator states consistent?

Thanks,
Viktor