[0/5] x86/HVM: emulation (MMIO) improvements

Message

Jan Beulich Sept. 4, 2024, 1:25 p.m. UTC

The main fix is patch 3, with the earlier patches setting the stage
and the latter ones simplifying other things at least a little in
exchange.

1: reduce recursion in linear_{read,write}()
2: allocate emulation cache entries dynamically
3: correct read/write split at page boundaries
4: slightly improve CMPXCHG16B emulation
5: drop redundant access splitting

Jan