KVM: s390: vsie: allow CRYCB FORMAT-1

Pierre Morel · borntraeger · commit 19fd83a64718 · 2018-09-28T15:50:11.000+02:00
When the host and guest both use a FORMAT-1 CRYCB, we copy
the guest's FORMAT-0 APCB to a shadow CRYCB for use by
vSIE.

Signed-off-by: Pierre Morel &lt;pmorel@linux.ibm.com&gt;
Signed-off-by: Tony Krowiak &lt;akrowiak@linux.ibm.com&gt;
Message-Id: &lt;20180925231641.4954-20-akrowiak@linux.vnet.ibm.com&gt;
Signed-off-by: Christian Borntraeger &lt;borntraeger@de.ibm.com&gt;
diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c
@@ -136,6 +136,19 @@ static int prepare_cpuflags(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
 	return 0;
 }
 
+/* Copy to APCB FORMAT0 from APCB FORMAT0 */
+static int setup_apcb00(struct kvm_vcpu *vcpu, unsigned long *apcb_s,
+			unsigned long apcb_o, unsigned long *apcb_h)
+{
+	if (read_guest_real(vcpu, apcb_o, apcb_s,
+			    sizeof(struct kvm_s390_apcb0)))
+		return -EFAULT;
+
+	bitmap_and(apcb_s, apcb_s, apcb_h, sizeof(struct kvm_s390_apcb0));
+
+	return 0;
+}
+
 /**
  * setup_apcb11 - Copy the FORMAT1 APCB from the guest to the shadow CRYCB
  * @vcpu: pointer to the virtual CPU
@@ -190,6 +203,12 @@ static int setup_apcb(struct kvm_vcpu *vcpu, struct kvm_s390_crypto_cb *crycb_s,
 		return setup_apcb11(vcpu, (unsigned long *)&crycb_s->apcb1,
 				    (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);
 	}
 	return -EINVAL;
 }
