KVM: s390: enable ib only if available

Let's enable intervention bypass only if the facility is acutally
available.

Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 2a239554eb890fcebbd513b4a39ea014c982eae1..340fb405bc2386cb06478b4854e08b9971a61f61 100644 (file)
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -1845,7 +1845,9 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
 
        if (test_kvm_facility(vcpu->kvm, 8))
                vcpu->arch.sie_block->ecb2 |= 0x08;
-       vcpu->arch.sie_block->eca   = 0xC1002000U;
+       vcpu->arch.sie_block->eca = 0x81002000U;
+       if (sclp.has_ib)
+               vcpu->arch.sie_block->eca |= 0x40000000U;
        if (sclp.has_siif)
                vcpu->arch.sie_block->eca |= 1;
        if (sclp.has_sigpif)