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| author | David Hildenbrand <dahi@linux.vnet.ibm.com> | 2015-01-15 17:56:18 +0100 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2015-02-09 12:44:10 +0100 |
| commit | 8e2207cdd087ebb031e9118d1fd0902c6533a5e5 (patch) | |
| tree | e5b6a5a31724e2450918ea7ac5af54ead882d440 /arch/s390 | |
| parent | f7819512996361280b86259222456fcf15aad926 (diff) | |
| download | blackbird-op-linux-8e2207cdd087ebb031e9118d1fd0902c6533a5e5.tar.gz blackbird-op-linux-8e2207cdd087ebb031e9118d1fd0902c6533a5e5.zip | |
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')
| -rw-r--r-- | arch/s390/kvm/interrupt.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c index c34e1d904ff6..073b5f387d1d 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 { |
