3.18-stable review patch. If anyone has any objections, please let me know.
------------------ From: David Hildenbrand <[email protected]> commit 8e2207cdd087ebb031e9118d1fd0902c6533a5e5 upstream. If a vm with no VCPUs is created, the injection of a floating irq leads to an endless loop in the kernel. Let's skip the search for a destination VCPU for a floating irq if no VCPUs were created. Reviewed-by: Dominik Dingel <[email protected]> Reviewed-by: Cornelia Huck <[email protected]> Signed-off-by: David Hildenbrand <[email protected]> Signed-off-by: Christian Borntraeger <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- arch/s390/kvm/interrupt.c | 2 ++ 1 file changed, 2 insertions(+) --- a/arch/s390/kvm/interrupt.c +++ b/arch/s390/kvm/interrupt.c @@ -850,6 +850,8 @@ static int __inject_vm(struct kvm *kvm, list_add_tail(&inti->list, &iter->list); } atomic_set(&fi->active, 1); + if (atomic_read(&kvm->online_vcpus) == 0) + goto unlock_fi; sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS); if (sigcpu == KVM_MAX_VCPUS) { do { -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
