linux-kernel - [PATCH 2/2] KVM: nVMX: trace nested vm entry

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Message-Id: <20210121171043.946761-3-mlevitsk@redhat.com>
Date:   Thu, 21 Jan 2021 19:10:43 +0200
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     kvm@...r.kernel.org
Cc:     Borislav Petkov <bp@...en8.de>,
        Paolo Bonzini <pbonzini@...hat.com>, x86@...nel.org,
        Wanpeng Li <wanpengli@...cent.com>,
        linux-kernel@...r.kernel.org,
        Sean Christopherson <seanjc@...gle.com>,
        Jim Mattson <jmattson@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Joerg Roedel <joro@...tes.org>,
        Maxim Levitsky <mlevitsk@...hat.com>
Subject: [PATCH 2/2] KVM: nVMX: trace nested vm entry

This is very helpful to debug nested VMX issues.

Signed-off-by: Maxim Levitsky <mlevitsk@...hat.com>
---
 arch/x86/kvm/trace.h      | 30 ++++++++++++++++++++++++++++++
 arch/x86/kvm/vmx/nested.c |  5 +++++
 arch/x86/kvm/x86.c        |  3 ++-
 3 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index 2de30c20bc264..ec75efdac3560 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -554,6 +554,36 @@ TRACE_EVENT(kvm_nested_vmrun,
 		__entry->npt ? "on" : "off")
 );
 
+
+/*
+ * Tracepoint for nested VMLAUNCH/VMRESUME
+ */
+TRACE_EVENT(kvm_nested_vmenter,
+	    TP_PROTO(__u64 rip, __u64 vmcs, __u64 nested_rip,
+		     __u32 entry_intr_info),
+	    TP_ARGS(rip, vmcs, nested_rip, entry_intr_info),
+
+	TP_STRUCT__entry(
+		__field(	__u64,		rip		)
+		__field(	__u64,		vmcs		)
+		__field(	__u64,		nested_rip	)
+		__field(	__u32,		entry_intr_info	)
+	),
+
+	TP_fast_assign(
+		__entry->rip			= rip;
+		__entry->vmcs			= vmcs;
+		__entry->nested_rip		= nested_rip;
+		__entry->entry_intr_info	= entry_intr_info;
+	),
+
+	TP_printk("rip: 0x%016llx vmcs: 0x%016llx nrip: 0x%016llx "
+		  "entry_intr_info: 0x%08x",
+		__entry->rip, __entry->vmcs, __entry->nested_rip,
+		__entry->entry_intr_info)
+);
+
+
 TRACE_EVENT(kvm_nested_intercepts,
 	    TP_PROTO(__u16 cr_read, __u16 cr_write, __u32 exceptions,
 		     __u32 intercept1, __u32 intercept2, __u32 intercept3),
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 0fbb46990dfce..20b0954f31bda 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -3327,6 +3327,11 @@ enum nvmx_vmentry_status nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu,
 		!(vmcs12->vm_entry_controls & VM_ENTRY_LOAD_BNDCFGS))
 		vmx->nested.vmcs01_guest_bndcfgs = vmcs_read64(GUEST_BNDCFGS);
 
+	trace_kvm_nested_vmenter(kvm_rip_read(vcpu),
+				 vmx->nested.current_vmptr,
+				 vmcs12->guest_rip,
+				 vmcs12->vm_entry_intr_info_field);
+
 	/*
 	 * Overwrite vmcs01.GUEST_CR3 with L1's CR3 if EPT is disabled *and*
 	 * nested early checks are disabled.  In the event of a "late" VM-Fail,
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index a480804ae27a3..757f4f88072af 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -11562,11 +11562,12 @@ 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_vmenter);
+EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmenter_failed);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit);
-EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmenter_failed);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_skinit);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intercepts);
-- 
2.26.2