KVM: s390: ucontrol: disable in-kernel irq stack

This patch disables the in-kernel interrupt stack for KVM virtual
machines that are controlled by user. Userspace has to take care
of handling interrupts on its own.

Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 02510946864e..5b5c28e471df 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -505,7 +505,8 @@ static int __vcpu_run(struct kvm_vcpu *vcpu)
         if (test_thread_flag(TIF_MCCK_PENDING))
                 s390_handle_mcck();
 
-        kvm_s390_deliver_pending_interrupts(vcpu);
+        if (!kvm_is_ucontrol(vcpu->kvm))
+                kvm_s390_deliver_pending_interrupts(vcpu);
 
         vcpu->arch.sie_block->icptcode = 0;
         local_irq_disable();