[PATCH v10 19/26] KVM: s390: vsie: allow CRYCB FORMAT-1

Tony Krowiak
2018-09-12T19:43:09Z

From: Pierre Morel <pmorel@linux.ibm.com>

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 <pmorel@linux.ibm.com>
Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
---
arch/s390/kvm/vsie.c | 19 +++++++++++++++++++
1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c
index 3a93278..0a26814 100644
--- 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;
}
--
1.7.1