On 5/11/11 9:21 AM, Sasha Levin wrote:
If you feel the 512MB vs guest_flat_to_host() trade-off is worth it,
I'll change it to work that way.
Why would it not be? This is 64-bit only, right? There's plenty of
virtual address
space and mprotect() should make sure we never allocate physical pages
for it.
Sure, there's some in-kernel overhead involved as well, but that's
extremely small.
I'm not worried about performance in guest_flat_to_host() but I think
the current
implementation is not very clean. If you want to mmap() two separate
regions,
we should have our own internal "memory map" that's used for this (and for
populating KVM end E820 maps).
So I think mmap'ing the gap is the cleanest solution for now. We can
revisit the
decision if we need even more regions in the future.
Pekka
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