From 09a400e78eaf02d8ab8e836edf864e1025c8e2d7 Mon Sep 17 00:00:00 2001 From: David Hildenbrand Date: Mon, 4 Apr 2016 15:57:08 +0200 Subject: [PATCH] KVM: s390: enable ibs only if available Let's enable interlock-and-broadcast suppression only if the facility is actually available. Reviewed-by: Christian Borntraeger Signed-off-by: David Hildenbrand Signed-off-by: Christian Borntraeger --- 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 d987eb8af059..ad93b40bfdc0 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -2789,6 +2789,8 @@ static void __disable_ibs_on_all_vcpus(struct kvm *kvm) static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu) { + if (!sclp.has_ibs) + return; kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu); kvm_s390_sync_request(KVM_REQ_ENABLE_IBS, vcpu); }