[PATCH v3 1/3] KVM: x86: Update trace function for nested VM entry to support VMX

Mingwei Zhang
2022-08-08T00:36:17Z

Update trace function for nested VM entry to support VMX. Existing trace
function only supports nested VMX and the information printed out is AMD
specific.

So, update trace_kvm_nested_vmrun() to trace_kvm_nested_vmenter(), since
'vmenter' is generic. Add a new field 'isa' to recognize Intel and AMD;
Update the output to print out VMX/SVM related naming respectively, eg.,
vmcb vs. vmcs; npt vs. ept.

Opportunistically update the call site of trace_kvm_nested_vmenter() to make
one line per parameter.

Signed-off-by: Mingwei Zhang <mizhang@google.com>
---
arch/x86/kvm/svm/nested.c | 6 ++++--
arch/x86/kvm/trace.h | 28 ++++++++++++++++++----------
arch/x86/kvm/x86.c | 2 +-
3 files changed, 23 insertions(+), 13 deletions(-)

diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index ba7cd26f438f..0a148a352c3a 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -724,11 +724,13 @@ int enter_svm_guest_mode(struct kvm_vcpu *vcpu, u64 vmcb12_gpa,
struct vcpu_svm *svm = to_svm(vcpu);
int ret;

- trace_kvm_nested_vmrun(svm->vmcb->save.rip, vmcb12_gpa,
+ trace_kvm_nested_vmenter(svm->vmcb->save.rip,
+ vmcb12_gpa,
vmcb12->save.rip,
vmcb12->control.int_ctl,
vmcb12->control.event_inj,
- vmcb12->control.nested_ctl);
+ vmcb12->control.nested_ctl,
+ KVM_ISA_SVM);

trace_kvm_nested_intercepts(vmcb12->control.intercepts[INTERCEPT_CR] & 0xffff,
vmcb12->control.intercepts[INTERCEPT_CR] >> 16,
diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index de4762517569..3ef29c7e4f69 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -578,10 +578,11 @@ TRACE_EVENT(kvm_pv_eoi,
/*
* Tracepoint for nested VMRUN
*/
-TRACE_EVENT(kvm_nested_vmrun,
+TRACE_EVENT(kvm_nested_vmenter,
TP_PROTO(__u64 rip, __u64 vmcb, __u64 nested_rip, __u32 int_ctl,
- __u32 event_inj, bool npt),
- TP_ARGS(rip, vmcb, nested_rip, int_ctl, event_inj, npt),
+ __u32 event_inj, bool tdp_enabled, __u32 isa),
+ TP_ARGS(rip, vmcb, nested_rip, int_ctl, event_inj, tdp_enabled,
+ isa),

TP_STRUCT__entry(
__field( __u64, rip )
@@ -589,7 +590,8 @@ TRACE_EVENT(kvm_nested_vmrun,
__field( __u64, nested_rip )
__field( __u32, int_ctl )
__field( __u32, event_inj )
- __field( bool, npt )
+ __field( bool, tdp_enabled )
+ __field( __u32, isa )
),

TP_fast_assign(
@@ -598,14 +600,20 @@ TRACE_EVENT(kvm_nested_vmrun,
__entry->nested_rip = nested_rip;
__entry->int_ctl = int_ctl;
__entry->event_inj = event_inj;
- __entry->npt = npt;
+ __entry->tdp_enabled = tdp_enabled;
+ __entry->isa = isa;
),

- TP_printk("rip: 0x%016llx vmcb: 0x%016llx nrip: 0x%016llx int_ctl: 0x%08x "
- "event_inj: 0x%08x npt: %s",
- __entry->rip, __entry->vmcb, __entry->nested_rip,
- __entry->int_ctl, __entry->event_inj,
- __entry->npt ? "on" : "off")
+ TP_printk("rip: 0x%016llx %s: 0x%016llx nested_rip: 0x%016llx "
+ "int_ctl: 0x%08x event_inj: 0x%08x nested_%s: %s",
+ __entry->rip,
+ __entry->isa == KVM_ISA_VMX ? "vmcs" : "vmcb",
+ __entry->vmcb,
+ __entry->nested_rip,
+ __entry->int_ctl,
+ __entry->event_inj,
+ __entry->isa == KVM_ISA_VMX ? "ept" : "npt",
+ __entry->tdp_enabled ? "on" : "off")
);

TRACE_EVENT(kvm_nested_intercepts,
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 1910e1e78b15..52f6351dc15b 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -13084,7 +13084,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr);
-EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun);
+EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmenter);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit);
--
2.37.1.559.g78731f0fdb-goog