Commit b10bd9a2 authored Feb 11, 2019 by Pierre Morel Committed by Christian Borntraeger Feb 11, 2019

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



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: 6ee74098 ("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>

parent bfeffd15

arch/s390/kvm/vsie.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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)

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