KVM: s390: Tracing APCB changes

kvm_arch_crypto_set_masks is a new function to centralize
the setup the APCB masks inside the CRYCB SIE satellite.

To trace APCB mask changes, we add KVM_EVENT() tracing to
both kvm_arch_crypto_set_masks and kvm_arch_crypto_clear_masks.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Message-Id: <1538728270-10340-2-git-send-email-pmorel@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

2 files changed, 43 insertions, 0 deletions

diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 36d35313e840..22aa4da91f7a 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -861,6 +861,8 @@ void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
                                  struct kvm_async_pf *work);
 
 void kvm_arch_crypto_clear_masks(struct kvm *kvm);
+void kvm_arch_crypto_set_masks(struct kvm *kvm, unsigned long *apm,
+                               unsigned long *aqm, unsigned long *adm);
 
 extern int sie64a(struct kvm_s390_sie_block *, u64 *);
 extern char sie_exit;
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 734d87d88eb3..22a320a9a00d 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2064,6 +2064,46 @@ static void kvm_s390_set_crycb_format(struct kvm *kvm)
                 kvm->arch.crypto.crycbd |= CRYCB_FORMAT1;
 }
 
+void kvm_arch_crypto_set_masks(struct kvm *kvm, unsigned long *apm,
+                               unsigned long *aqm, unsigned long *adm)
+{
+        struct kvm_s390_crypto_cb *crycb = kvm->arch.crypto.crycb;
+
+        mutex_lock(&kvm->lock);
+        kvm_s390_vcpu_block_all(kvm);
+
+        switch (kvm->arch.crypto.crycbd & CRYCB_FORMAT_MASK) {
+        case CRYCB_FORMAT2: /* APCB1 use 256 bits */
+                memcpy(crycb->apcb1.apm, apm, 32);
+                VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx %016lx %016lx %016lx",
+                         apm[0], apm[1], apm[2], apm[3]);
+                memcpy(crycb->apcb1.aqm, aqm, 32);
+                VM_EVENT(kvm, 3, "SET CRYCB: aqm %016lx %016lx %016lx %016lx",
+                         aqm[0], aqm[1], aqm[2], aqm[3]);
+                memcpy(crycb->apcb1.adm, adm, 32);
+                VM_EVENT(kvm, 3, "SET CRYCB: adm %016lx %016lx %016lx %016lx",
+                         adm[0], adm[1], adm[2], adm[3]);
+                break;
+        case CRYCB_FORMAT1:
+        case CRYCB_FORMAT0: /* Fall through both use APCB0 */
+                memcpy(crycb->apcb0.apm, apm, 8);
+                memcpy(crycb->apcb0.aqm, aqm, 2);
+                memcpy(crycb->apcb0.adm, adm, 2);
+                VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx aqm %04x adm %04x",
+                         apm[0], *((unsigned short *)aqm),
+                         *((unsigned short *)adm));
+                break;
+        default:        /* Can not happen */
+                break;
+        }
+
+        /* recreate the shadow crycb for each vcpu */
+        kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART);
+        kvm_s390_vcpu_unblock_all(kvm);
+        mutex_unlock(&kvm->lock);
+}
+EXPORT_SYMBOL_GPL(kvm_arch_crypto_set_masks);
+
 void kvm_arch_crypto_clear_masks(struct kvm *kvm)
 {
         mutex_lock(&kvm->lock);
@@ -2074,6 +2114,7 @@ void kvm_arch_crypto_clear_masks(struct kvm *kvm)
         memset(&kvm->arch.crypto.crycb->apcb1, 0,
                sizeof(kvm->arch.crypto.crycb->apcb1));
 
+        VM_EVENT(kvm, 3, "%s", "CLR CRYCB:");
         /* recreate the shadow crycb for each vcpu */
         kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART);
         kvm_s390_vcpu_unblock_all(kvm);