KVM: x86: reintroduce kvm_is_mmio_pfn
KVM: x86: reintroduce kvm_is_mmio_pfn

The call to get_mt_mask was really using kvm_is_reserved_pfn to
detect an MMIO-backed page.  In this case, we want "false" to be
returned for the zero page.

Reintroduce a separate kvm_is_mmio_pfn predicate for this use
only.

Signed-off-by: Paolo Bonzini <69d3ebcf5ee4e7f05a50dc23cd96655b730804b4@redhat.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs