Re: Single memory slot

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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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