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authorDavid Hildenbrand <dahi@linux.vnet.ibm.com>2015-01-15 17:56:18 +0100
committerChristian Borntraeger <borntraeger@de.ibm.com>2015-02-09 12:44:10 +0100
commit8e2207cdd087ebb031e9118d1fd0902c6533a5e5 (patch)
treee5b6a5a31724e2450918ea7ac5af54ead882d440 /arch/s390/kvm/interrupt.c
parentf7819512996361280b86259222456fcf15aad926 (diff)
downloadop-kernel-dev-8e2207cdd087ebb031e9118d1fd0902c6533a5e5.zip
op-kernel-dev-8e2207cdd087ebb031e9118d1fd0902c6533a5e5.tar.gz
KVM: s390: floating irqs: fix user triggerable endless loop
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@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Cc: stable@vger.kernel.org # v3.15+ Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/kvm/interrupt.c')
-rw-r--r--arch/s390/kvm/interrupt.c2
1 files changed, 2 insertions, 0 deletions
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 {
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