KVM: s390: extend kvm_s390_shadow_fault to return entry pointer

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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 <imbrenda@linux.ibm.com>
Cc: stable@vger.kernel.org
Reviewed-by: Janosch Frank <frankja@de.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Link: https://lore.kernel.org/r/20210302174443.514363-3-imbrenda@linux.ibm.com
[borntraeger@de.ibm.com: fold in a fix from Claudio]
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

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This commit is contained in:

Claudio Imbrenda 2021-02-01 17:26:54 +01:00 • committed by Christian Borntraeger

parent f85f1baaa1

commit 5ac14bac08

3 changed files with 34 additions and 10 deletions

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30

arch/s390/kvm/gaccess.c

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6

arch/s390/kvm/gaccess.h

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8

arch/s390/kvm/vsie.c

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