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s390: vsie: Use effective CRYCBD.31 to check CRYCBD validity

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When facility.76 MSAX3 is present for the guest we must issue a validity
interception if the CRYCBD is not valid.

The bit CRYCBD.31 is an effective field and tested at each guest level
and has for effect to mask the facility.76

It follows that if CRYCBD.31 is clear and AP is not in use  we do not
have to test the CRYCBD validatity even if facility.76 is present in the
host.

Fixes: 6ee7409820 ("KVM: s390: vsie: allow CRYCB FORMAT-0")
Cc: stable@vger.kernel.org

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Reported-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Message-Id: <1549876849-32680-1-git-send-email-pmorel@linux.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Pierre Morel 2019-02-11 10:20:49 +01:00 committed by Christian Borntraeger
parent bfeffd1552
commit b10bd9a256
1 changed files with 1 additions and 1 deletions
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2
arch/s390/kvm/vsie.c
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@ -297,7 +297,7 @@ static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
scb_s->crycbd = 0;
apie_h = vcpu->arch.sie_block->eca & ECA_APIE;
if (!apie_h && !key_msk)
if (!apie_h && (!key_msk || fmt_o == CRYCB_FORMAT0))
return 0;
if (!crycb_addr)