KVM: arm/arm64: vgic-new: Removel harmful BUG_ON

When changing the active bit from an MMIO trap, we decide to
explode if the intid is that of a private interrupt.

This flawed logic comes from the fact that we were assuming that
kvm_vcpu_kick() as called by kvm_arm_halt_vcpu() would not return before
the called vcpu responded, but this is not the case, so we need to
perform this wait even for private interrupts.

Dropping the BUG_ON seems like the right thing to do.

 [ Commit message tweaked by Christoffer ]

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>

1 files changed, 1 insertions, 3 deletions

diff --git a/virt/kvm/arm/vgic/vgic-mmio.c b/virt/kvm/arm/vgic/vgic-mmio.c
index 059595ec3da0..9f6fab74dce7 100644
--- a/virt/kvm/arm/vgic/vgic-mmio.c
+++ b/virt/kvm/arm/vgic/vgic-mmio.c
@@ -191,10 +191,8 @@ static void vgic_mmio_change_active(struct kvm_vcpu *vcpu, struct vgic_irq *irq,
          * other thread sync back the IRQ.
          */
         while (irq->vcpu && /* IRQ may have state in an LR somewhere */
-               irq->vcpu->cpu != -1) { /* VCPU thread is running */
-                BUG_ON(irq->intid < VGIC_NR_PRIVATE_IRQS);
+               irq->vcpu->cpu != -1) /* VCPU thread is running */
                 cond_resched_lock(&irq->irq_lock);
-        }
 
         irq->active = new_active_state;
         if (new_active_state)