From: David Hildenbrand <dahi@xxxxxxxxxxxxxxxxxx>
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 <dingel@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Cornelia Huck <cornelia.huck@xxxxxxxxxx>
Signed-off-by: David Hildenbrand <dahi@xxxxxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # v3.15+
Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
---
arch/s390/kvm/interrupt.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index c34e1d9..073b5f3 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -1244,6 +1244,8 @@ static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
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 {
--
1.9.3
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