KVM: s390: vsie: allow guest FORMAT-1 CRYCB on host FORMAT-2

When the guest schedules a SIE with a CRYCB FORMAT-1 CRYCB,
we are able to schedule it in the host with a FORMAT-2 CRYCB
if the host uses FORMAT-2.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Message-Id: <20180925231641.4954-23-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 90ae310..ca64663 100644 (file)
--- a/arch/s390/kvm/vsie.c
+++ b/arch/s390/kvm/vsie.c
@@ -135,6 +135,22 @@ static int prepare_cpuflags(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
        atomic_set(&scb_s->cpuflags, newflags);
        return 0;
 }
+/* Copy to APCB FORMAT1 from APCB FORMAT0 */
+static int setup_apcb10(struct kvm_vcpu *vcpu, struct kvm_s390_apcb1 *apcb_s,
+                       unsigned long apcb_o, struct kvm_s390_apcb1 *apcb_h)
+{
+       struct kvm_s390_apcb0 tmp;
+
+       if (read_guest_real(vcpu, apcb_o, &tmp, sizeof(struct kvm_s390_apcb0)))
+               return -EFAULT;
+
+       apcb_s->apm[0] = apcb_h->apm[0] & tmp.apm[0];
+       apcb_s->aqm[0] = apcb_h->aqm[0] & tmp.aqm[0] & 0xffff000000000000UL;
+       apcb_s->adm[0] = apcb_h->adm[0] & tmp.adm[0] & 0xffff000000000000UL;
+
+       return 0;
+
+}
 
 /**
  * setup_apcb00 - Copy to APCB FORMAT0 from APCB FORMAT0
@@ -212,11 +228,18 @@ static int setup_apcb(struct kvm_vcpu *vcpu, struct kvm_s390_crypto_cb *crycb_s,
                                    (unsigned long) &crycb->apcb1,
                                    (unsigned long *)&crycb_h->apcb1);
        case CRYCB_FORMAT1:
-               if (fmt_h != CRYCB_FORMAT1)
-                       return -EINVAL;
-               return setup_apcb00(vcpu, (unsigned long *) &crycb_s->apcb0,
-                                   (unsigned long) &crycb->apcb0,
-                                   (unsigned long *) &crycb_h->apcb0);
+               switch (fmt_h) {
+               case CRYCB_FORMAT2:
+                       return setup_apcb10(vcpu, &crycb_s->apcb1,
+                                           (unsigned long) &crycb->apcb0,
+                                           &crycb_h->apcb1);
+               case CRYCB_FORMAT1:
+                       return setup_apcb00(vcpu,
+                                           (unsigned long *) &crycb_s->apcb0,
+                                           (unsigned long) &crycb->apcb0,
+                                           (unsigned long *) &crycb_h->apcb0);
+               }
+               break;
        case CRYCB_FORMAT0:
                if ((crycb_o & PAGE_MASK) != ((crycb_o + 32) & PAGE_MASK))
                        return -EACCES;