KVM: MMU: introduce is_shadow_zero_bits_set()
KVM: MMU: introduce is_shadow_zero_bits_set()

We have the same data struct to check reserved bits on guest page tables
and shadow page tables, split is_rsvd_bits_set() so that the logic can be
shared between these two paths

Signed-off-by: Xiao Guangrong <6fc2b53ba6812a2fb8db97f50bf4ccdfcb5efe9c@linux.intel.com>
Signed-off-by: Paolo Bonzini <69d3ebcf5ee4e7f05a50dc23cd96655b730804b4@redhat.com>

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