[PATCH v2 1/2] KVM: nested/x86: update trace_kvm_nested_vmrun() to suppot VMX

Mingwei Zhang
2022-07-18T17:13:44Z

Update trace_kvm_nested_vmrun() to support VMX by adding a new field 'isa';
update the output to print out VMX/SVM related naming respectively,
eg., vmcb vs. vmcs; npt vs. ept.

In addition, print nested EPT/NPT address instead of the 1bit of nested
ept/npt on/off. This should convey more information in the trace. When
nested ept/npt is not used, simply print "0x0" so that we don't lose any
information.

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

Signed-off-by: Mingwei Zhang <mizhang@google.com>
---
arch/x86/kvm/svm/nested.c | 7 +++++--
arch/x86/kvm/trace.h | 29 ++++++++++++++++++++---------
2 files changed, 25 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index ba7cd26f438f..8581164b6808 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -724,11 +724,14 @@ 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_vmrun(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,
+ vmcb12->control.nested_cr3,
+ 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..aac4c8bd2c3a 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -580,8 +580,10 @@ TRACE_EVENT(kvm_pv_eoi,
*/
TRACE_EVENT(kvm_nested_vmrun,
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 npt_enabled, __u64 npt_addr,
+ __u32 isa),
+ TP_ARGS(rip, vmcb, nested_rip, int_ctl, event_inj, npt_enabled,
+ npt_addr, isa),

TP_STRUCT__entry(
__field( __u64, rip )
@@ -589,7 +591,9 @@ TRACE_EVENT(kvm_nested_vmrun,
__field( __u64, nested_rip )
__field( __u32, int_ctl )
__field( __u32, event_inj )
- __field( bool, npt )
+ __field( bool, npt_enabled )
+ __field( __u64, npt_addr )
+ __field( __u32, isa )
),

TP_fast_assign(
@@ -598,14 +602,21 @@ TRACE_EVENT(kvm_nested_vmrun,
__entry->nested_rip = nested_rip;
__entry->int_ctl = int_ctl;
__entry->event_inj = event_inj;
- __entry->npt = npt;
+ __entry->npt_enabled = npt_enabled;
+ __entry->npt_addr = npt_addr;
+ __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: 0x%016llx",
+ __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->npt_enabled ? __entry->npt_addr : 0x0)
);

TRACE_EVENT(kvm_nested_intercepts,
--
2.37.0.170.g444d1eabd0-goog