KVM: s390: extend kvm_s390_shadow_fault to return entry pointer

Extend kvm_s390_shadow_fault to return the pointer to the valid leaf
DAT table entry, or to the invalid entry.

Also return some flags in the lower bits of the address:
PEI_DAT_PROT: indicates that DAT protection applies because of the
              protection bit in the segment (or, if EDAT, region) tables.
PEI_NOT_PTE: indicates that the address of the DAT table entry returned
             does not refer to a PTE, but to a segment or region table.

Signed-off-by: Claudio Imbrenda <[email protected]>
Cc: [email protected]
Reviewed-by: Janosch Frank <[email protected]>
Reviewed-by: David Hildenbrand <[email protected]>
Reviewed-by: Christian Borntraeger <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[[email protected]: fold in a fix from Claudio]
Signed-off-by: Christian Borntraeger <[email protected]>

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