Switch from MMIO PCI bars to PIO PCI bars.
Switch from MMIO PCI bars to PIO PCI bars.

This results in a substantial performance improvement.

Emulation of MMIO accesses is much slower, as the actual instruction
must be emulated. PIO accesses can be emulated much faster, since the
data is well-defined and inline.

nathanaelle/novm,google/novm,nathanaelle/novm,viraptor/novm,viraptor/novm,nathanaelle/novm,viraptor/novm,viraptor/novm,nathanaelle/novm,google/novm,google/novm,google/novm