KVM: ARM: Reintroduce trace_kvm_hvc

This one got lost in the move to handle_exit, so let's reintroduce it
using an accessor to the immediate value field like the other ones.

Signed-off-by: Christoffer Dall <cdall@cs.columbia.edu>
diff --git a/arch/arm/kvm/handle_exit.c b/arch/arm/kvm/handle_exit.c
index f1cc3a8..3013018 100644
--- a/arch/arm/kvm/handle_exit.c
+++ b/arch/arm/kvm/handle_exit.c
@@ -23,6 +23,8 @@
 #include <asm/kvm_mmu.h>
 #include <asm/kvm_psci.h>
 
+#include "trace.h"
+
 typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *);
 
 static int handle_svc_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
@@ -35,6 +37,9 @@
 
 static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
 {
+	trace_kvm_hvc(*vcpu_pc(vcpu), *vcpu_reg(vcpu, 0),
+		      kvm_vcpu_hvc_get_imm(vcpu));
+
 	if (kvm_psci_call(vcpu))
 		return 1;