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Commit 0487c44d authored by David Hildenbrand's avatar David Hildenbrand Committed by Christian Borntraeger
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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: default avatarDavid Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
Fixes: commit 053dd230 ("KVM: s390: force ibc into valid range")
Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
parent af8c34ce

arch/s390/kvm/kvm-s390.c

+1 −1
Original line number Diff line number Diff line
@@ -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)