linux-kernel - [PATCH] kvm: nVMX: add tracepoint for kvm:kvm_nested

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Date:   Sun, 26 Jun 2022 20:05:38 +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, David Matlack <dmatlack@...gle.com>,
        Mingwei Zhang <mizhang@...gle.com>
Subject: [PATCH] kvm: nVMX: add tracepoint for kvm:kvm_nested_vmrun

From: David Matlack <dmatlack@...gle.com>

This tracepoint is called by nested SVM during emulated VMRUN. Call
also during emulated VMLAUNCH and VMRESUME in nested VMX.

Attempt to use analagous VMCS fields to the VMCB fields that are
reported in the SVM case:

"int_ctl": 32-bit field of the VMCB that the CPU uses to deliver virtual
interrupts. The analagous VMCS field is the 16-bit "guest interrupt
status".

"event_inj": 32-bit field of VMCB that is used to inject events
(exceptions and interrupts) into the guest. The analagous VMCS field
is the "VM-entry interruption-information field".

"npt": 1 when the VCPU has enabled nested paging. The analagous VMCS
field is the enable-EPT execution control.

Signed-off-by: David Matlack <dmatlack@...gle.com>
[Move the code into the nested_vmx_enter_non_root_mode().]
Signed-off-by: Mingwei Zhang <mizhang@...gle.com>
---
 arch/x86/kvm/vmx/nested.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index f5cb18e00e78..29cc36cf2568 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -3367,6 +3367,13 @@ enum nvmx_vmentry_status nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu,
 	};
 	u32 failed_index;
 
+	trace_kvm_nested_vmrun(
+		kvm_rip_read(vcpu), vmx->nested.current_vmptr,
+		vmcs12->guest_rip,
+		vmcs12->guest_intr_status,
+		vmcs12->vm_entry_intr_info_field,
+		vmcs12->secondary_vm_exec_control & SECONDARY_EXEC_ENABLE_EPT);
+
 	kvm_service_local_tlb_flush_requests(vcpu);
 
 	evaluate_pending_interrupts = exec_controls_get(vmx) &

base-commit: 922d4578cfd017da67f545bfd07331bda86f795d
-- 
2.37.0.rc0.161.g10f37bed90-goog