ARM: KVM: extend WFI tracepoint to differentiate between wfi and wfe

Currently the trace printk talks about "wfi" only, though the trace point triggers both on wfi and wfe traps.
Add a parameter to differentiate between the two.

Signed-off-by Andre Przywara <[email protected]>

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Hi,

this replaces the patch I sent earlier and now just contains the ARM parts of it. The arm64 part is now merged into Wei's patch (which isn't a prerequisite for this one anymore).

Cheers,
Andre.

 arch/arm/kvm/handle_exit.c |    8 +++++---
 arch/arm/kvm/trace.h       |   11 +++++++----
 2 files changed, 12 insertions(+), 7 deletions(-)

arch/arm/kvm/handle_exit.c +5 -3

index a96a804..95f12b2 100644
@@ -87,11 +87,13 @@ static int handle_dabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
  */
 static int kvm_handle_wfx(struct kvm_vcpu *vcpu, struct kvm_run *run)
 {
-	trace_kvm_wfi(*vcpu_pc(vcpu));
-	if (kvm_vcpu_get_hsr(vcpu) & HSR_WFI_IS_WFE)
+	if (kvm_vcpu_get_hsr(vcpu) & HSR_WFI_IS_WFE) {
+		trace_kvm_wfx(*vcpu_pc(vcpu), true);
 		kvm_vcpu_on_spin(vcpu);
-	else
+	} else {
+		trace_kvm_wfx(*vcpu_pc(vcpu), false);
 		kvm_vcpu_block(vcpu);
+	}
 
 	kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
 

arch/arm/kvm/trace.h +7 -4

index b1d640f..f741449 100644
@@ -140,19 +140,22 @@ TRACE_EVENT(kvm_emulate_cp15_imp,
 			__entry->CRm, __entry->Op2)
 );
 
-TRACE_EVENT(kvm_wfi,
-	TP_PROTO(unsigned long vcpu_pc),
-	TP_ARGS(vcpu_pc),
+TRACE_EVENT(kvm_wfx,
+	TP_PROTO(unsigned long vcpu_pc, bool is_wfe),
+	TP_ARGS(vcpu_pc, is_wfe),
 
 	TP_STRUCT__entry(
 		__field(	unsigned long,	vcpu_pc		)
+		__field(		 bool,	is_wfe		)
 	),
 
 	TP_fast_assign(
 		__entry->vcpu_pc		= vcpu_pc;
+		__entry->is_wfe			= is_wfe;
 	),
 
-	TP_printk("guest executed wfi at: 0x%08lx", __entry->vcpu_pc)
+	TP_printk("guest executed wf%c at: 0x%08lx",
+		__entry->is_wfe ? 'e' : 'i', __entry->vcpu_pc)
 );
 
 TRACE_EVENT(kvm_unmap_hva,

Currently the trace printk talks about "wfi" only, though the trace point triggers both on wfi and wfe traps.
Add a parameter to differentiate between the two.

Signed-off-by Andre Przywara <[email protected]>

---