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>

diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index 54ee1c0..6a8c32e 100644 (file)
--- a/arch/powerpc/kvm/booke.c
+++ b/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);
 

diff --git a/arch/powerpc/kvm/bookehv_interrupts.S b/arch/powerpc/kvm/bookehv_interrupts.S
index e8ed7d6..be3de1d 100644 (file)
--- a/arch/powerpc/kvm/bookehv_interrupts.S
+++ b/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 */