linux-kernel - [PATCH 1/2] KVM: nested/x86: update trace_kvm_nested

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Date:   Fri,  8 Jul 2022 23:23:03 +0000
From:   Mingwei Zhang <mizhang@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Mingwei Zhang <mizhang@...gle.com>,
        David Matlack <dmatlack@...gle.com>
Subject: [PATCH 1/2] KVM: nested/x86: update trace_kvm_nested_vmrun() to
 suppot VMX

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@...gle.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,
-- 
2.37.0.144.g8ac04bfd2-goog