[PATCH v11 15/26] KVM: s390: Clear Crypto Control Block when using vSIE

[Tony Krowiak]

From: Pierre Morel <pmorel@xxxxxxxxxxxxx>

When we clear the Crypto Control Block (CRYCB) used by a guest
level 2, the vSIE shadow CRYCB for guest level 3 must be updated
before the guest uses it.

We achieve this by using the KVM_REQ_VSIE_RESTART synchronous
request for each vCPU belonging to the guest to force the reload
of the shadow CRYCB before rerunning the guest level 3.

Signed-off-by: Pierre Morel <pmorel@xxxxxxxxxxxxx>
Signed-off-by: Tony Krowiak <akrowiak@xxxxxxxxxxxxx>
---
 arch/s390/kvm/kvm-s390.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 75aa5aa4a926..c94ef2d0dbe4 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2043,6 +2043,8 @@ void kvm_arch_crypto_clear_masks(struct kvm *kvm)
 	memset(&kvm->arch.crypto.crycb->apcb1, 0,
 	       sizeof(kvm->arch.crypto.crycb->apcb1));
 
+	/* 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);
 }
-- 
2.19.0.221.g150f307