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H A Dtypedefs.h1f4e496e1fc2eb6c8bf377a0f9695930c380bfd3 Tue Nov 22 11:04:52 UTC 2016 Paolo Bonzini <pbonzini@redhat.com> exec: introduce MemoryRegionCache

Device models often have to perform multiple access to a single
memory region that is known in advance, but would to use "DMA-style"
functions instead of address_space_map/unmap. This can happen
for example when the data has to undergo endianness conversion.
Introduce a new data structure to cache the result of
address_space_translate without forcing usage of a host address
like address_space_map does.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>