kvm/ppc/booke64: Fix lazy ee handling in kvmppc_handle_exit()

EE is hard-disabled on entry to kvmppc_handle_exit(), so call
hard_irq_disable() so that PACA_IRQ_HARD_DIS is set, and soft_enabled
is unset.

Without this, we get warnings such as arch/powerpc/kernel/time.c:300,
and sometimes host kernel hangs.
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>

arch/powerpc/kvm/booke.c

@@ -834,6 +834,17 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
 	int s;
 	int idx;
 
+#ifdef CONFIG_PPC64
+	WARN_ON(local_paca->irq_happened != 0);
+#endif
+
+	/*
+	 * We enter with interrupts disabled in hardware, but
+	 * we need to call hard_irq_disable anyway to ensure that
+	 * the software state is kept in sync.
+	 */
+	hard_irq_disable();
+
 	/* update before a new last_exit_type is rewritten */
 	kvmppc_update_timing_stats(vcpu);