From 0487c44d1e1070b636ba3f3a12494ec456c2d005 Mon Sep 17 00:00:00 2001 From: David Hildenbrand Date: Fri, 10 Jun 2016 09:22:31 +0200 Subject: [PATCH] KVM: s390: ignore IBC if zero Looks like we forgot about the special IBC value of 0 meaning "no IBC". Let's fix that, otherwise it gets rounded up and suddenly an IBC is active with the lowest possible machine. Signed-off-by: David Hildenbrand Reviewed-by: Cornelia Huck Fixes: commit 053dd2308d81 ("KVM: s390: force ibc into valid range") Signed-off-by: Christian Borntraeger --- arch/s390/kvm/kvm-s390.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 6d8ec3ac9dd8..c9ae53924a69 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -657,7 +657,7 @@ static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr) kvm->arch.model.cpuid = proc->cpuid; lowest_ibc = sclp.ibc >> 16 & 0xfff; unblocked_ibc = sclp.ibc & 0xfff; - if (lowest_ibc) { + if (lowest_ibc && proc->ibc) { if (proc->ibc > unblocked_ibc) kvm->arch.model.ibc = unblocked_ibc; else if (proc->ibc < lowest_ibc)