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>

arch/arm/include/asm/kvm_emulate.h

@@ -158,4 +158,9 @@ static inline u8 kvm_vcpu_trap_get_fault(struct kvm_vcpu *vcpu)
 	return kvm_vcpu_get_hsr(vcpu) & HSR_FSC_TYPE;
 }
 
+static inline u32 kvm_vcpu_hvc_get_imm(struct kvm_vcpu *vcpu)
+{
+	return kvm_vcpu_get_hsr(vcpu) & HSR_HVC_IMM_MASK;
+}
+
 #endif /* __ARM_KVM_EMULATE_H__ */

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_svc_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
 
 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;