KVM: PPC: Book3E HV: call RECONCILE_IRQ_STATE to sync the software state

Rather than calling hard_irq_disable() when we're back in C code
we can just call RECONCILE_IRQ_STATE to soft disable IRQs while
we're already in hard disabled state.

This should be functionally equivalent to the code before, but
cleaner and faster.

Signed-off-by: Tiejun Chen <tiejun.chen@windriver.com>
[agraf: fix comment, commit message]
Signed-off-by: Alexander Graf <agraf@suse.de>

arch/powerpc/kvm/booke.c

@@ -879,17 +879,6 @@ 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);
 

arch/powerpc/kvm/bookehv_interrupts.S

@@ -33,6 +33,8 @@
 
 #ifdef CONFIG_64BIT
 #include <asm/exception-64e.h>
+#include <asm/hw_irq.h>
+#include <asm/irqflags.h>
 #else
 #include "../kernel/head_booke.h" /* for THREAD_NORMSAVE() */
 #endif
@@ -465,6 +467,15 @@ _GLOBAL(kvmppc_resume_host)
 	mtspr	SPRN_EPCR, r3
 	isync
 
+#ifdef CONFIG_64BIT
+	/*
+	 * We enter with interrupts disabled in hardware, but
+	 * we need to call RECONCILE_IRQ_STATE to ensure
+	 * that the software state is kept in sync.
+	 */
+	RECONCILE_IRQ_STATE(r3,r5)
+#endif
+
 	/* Switch to kernel stack and jump to handler. */
 	PPC_LL	r3, HOST_RUN(r1)
 	mr	r5, r14 /* intno */