KVM: s390: vsie: allow guest FORMAT-0 CRYCB on host FORMAT-1

When the guest schedules a SIE with a FORMAT-0 CRYCB,
we are able to schedule it in the host with a FORMAT-1
CRYCB if the host uses FORMAT-1 or FORMAT-0.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Message-Id: <20180925231641.4954-22-akrowiak@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c
index 67a5536..90ae310 100644 (file)
--- a/arch/s390/kvm/vsie.c
+++ b/arch/s390/kvm/vsie.c
@@ -220,11 +220,17 @@ static int setup_apcb(struct kvm_vcpu *vcpu, struct kvm_s390_crypto_cb *crycb_s,
        case CRYCB_FORMAT0:
                if ((crycb_o & PAGE_MASK) != ((crycb_o + 32) & PAGE_MASK))
                        return -EACCES;
-               if (fmt_h != CRYCB_FORMAT0)
+
+               switch (fmt_h) {
+               case CRYCB_FORMAT2:
                        return -EINVAL;
-               return setup_apcb00(vcpu, (unsigned long *) &crycb_s->apcb0,
-                                   (unsigned long) &crycb->apcb0,
-                                   (unsigned long *) &crycb_h->apcb0);
+               case CRYCB_FORMAT1:
+               case CRYCB_FORMAT0:
+                       return setup_apcb00(vcpu,
+                                           (unsigned long *) &crycb_s->apcb0,
+                                           (unsigned long) &crycb->apcb0,
+                                           (unsigned long *) &crycb_h->apcb0);
+               }
        }
        return -EINVAL;
 }