Marcelo Tosatti wrote:
Also it would be interesting to see the MMIO comparison with EPT/NPT,
it probably sucks much less than what you're seeing.
Why would NPT improve mmio? If anything, it would be worse, since the
processor has to do the nested walk.
I suppose the hardware is much more efficient than walk_addr? There's
all this kmalloc, spinlock, etc overhead in the fault path.
mmio still has to do a walk_addr, even with npt. We don't take the mmu
lock during walk_addr.
--
Do not meddle in the internals of kernels, for they are subtle and quick to
panic.
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