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KVM: export __gfn_to_pfn_memslot, drop gfn_to_pfn_async
gfn_to_pfn_async is used in just one place, and because of x86-specific
treatment that place will need to look at the memory slot. Hence inline
it into try_async_pf and export __gfn_to_pfn_memslot.
The patch also switches the subsequent call to gfn_to_pfn_prot to use
__gfn_to_pfn_memslot. This is a small optimization. Finally, remove
the now-unused async argument of __gfn_to_pfn.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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