[PATCH 1/2] booke/bookehv: Add host crit-watchdog exception support

[Bharat Bhushan <r65777@xxxxxxxxxxxxx>]

Signed-off-by: Bharat Bhushan <bharat.bhushan@xxxxxxxxxxxxx>
---
 arch/powerpc/include/asm/hw_irq.h |    2 ++
 arch/powerpc/kvm/booke.c          |   21 +++++++++++++++++++++
 2 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/include/asm/hw_irq.h b/arch/powerpc/include/asm/hw_irq.h
index c9aac24..2aadb47 100644
--- a/arch/powerpc/include/asm/hw_irq.h
+++ b/arch/powerpc/include/asm/hw_irq.h
@@ -34,6 +34,8 @@ extern void __replay_interrupt(unsigned int vector);
 
 extern void timer_interrupt(struct pt_regs *);
 extern void performance_monitor_exception(struct pt_regs *regs);
+extern void WatchdogException(struct pt_regs *regs);
+extern void unknown_exception(struct pt_regs *regs);
 
 #ifdef CONFIG_PPC64
 #include <asm/paca.h>
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index 86681ee..d25a097 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -612,6 +612,12 @@ static void kvmppc_fill_pt_regs(struct pt_regs *regs)
 	regs->link = lr;
 }
 
+/*
+ * For interrupts needed to be handled by host interrupt handlers,
+ * corresponding host handler are called from here in similar way
+ * (but not exact) as they are called from low level handler
+ * (such as from arch/powerpc/kernel/head_fsl_booke.S).
+ */
 static void kvmppc_restart_interrupt(struct kvm_vcpu *vcpu,
 				     unsigned int exit_nr)
 {
@@ -639,6 +645,17 @@ static void kvmppc_restart_interrupt(struct kvm_vcpu *vcpu,
 		kvmppc_fill_pt_regs(&regs);
 		performance_monitor_exception(&regs);
 		break;
+	case BOOKE_INTERRUPT_WATCHDOG:
+		kvmppc_fill_pt_regs(&regs);
+#ifdef CONFIG_BOOKE_WDT
+		WatchdogException(&regs);
+#else
+		unknown_exception(&regs);
+#endif
+		break;
+	case BOOKE_INTERRUPT_CRITICAL:
+		unknown_exception(&regs);
+		break;
 	}
 }
 
@@ -683,6 +700,10 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
 		r = RESUME_GUEST;
 		break;
 
+	case BOOKE_INTERRUPT_WATCHDOG:
+		r = RESUME_GUEST;
+		break;
+
 	case BOOKE_INTERRUPT_DOORBELL:
 		kvmppc_account_exit(vcpu, DBELL_EXITS);
 		r = RESUME_GUEST;
-- 
1.7.0.4


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