Avi Kivity wrote:
One way to improve the gfn_to_pfn() memslot search is to register just
one slot. This can only work on 64-bit, since even the smallest
guests need 4GB of physical address space. Apart from speeding up
gfn_to_page(), it would also speed up mmio which must iterate over all
slots, so a lookup cache cannot help.
This would require quite a bunch of changes:
- modify gfn_to_pfn() to fail gracefully if the page is in the slot
but unmapped (hole handling)
- modify qemu to reserve the guest physical address space
It could potentially speed up qemu quite a lot too as we would return to
a model where host va == fixed address + guest pa. That makes things
like stl_phys/ldl_phys trivial.
Regards,
Anthony Liguori
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