linux-kernel - [PATCH v2 2/2] KVM: x86: Add missing trace points for RDMSR/WRMSR in emulator path

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Date:   Fri, 02 Sep 2022 10:47:01 +0800
From:   "Hou Wenlong" <houwenlong.hwl@...group.com>
To:     kvm@...r.kernel.org
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2] KVM: x86: Add missing trace points for RDMSR/WRMSR in emulator path

Since the RDMSR/WRMSR emulation uses a sepearte emualtor interface,
the trace points for RDMSR/WRMSR can be added in emulator path like
normal path.

Signed-off-by: Hou Wenlong <houwenlong.hwl@...group.com>
---
 arch/x86/kvm/x86.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 2596f5736743..1a224e575b0b 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7927,9 +7927,12 @@ static int emulator_get_msr_with_filter(struct x86_emulate_ctxt *ctxt,
 		if (kvm_msr_user_space(vcpu, msr_index, KVM_EXIT_X86_RDMSR, 0,
 				       complete_emulated_rdmsr, r))
 			return X86EMUL_IO_NEEDED;
+
+		trace_kvm_msr_read_ex(msr_index);
 		return X86EMUL_PROPAGATE_FAULT;
 	}
 
+	trace_kvm_msr_read(msr_index, *pdata);
 	return X86EMUL_CONTINUE;
 }
 
@@ -7947,9 +7950,12 @@ static int emulator_set_msr_with_filter(struct x86_emulate_ctxt *ctxt,
 		if (kvm_msr_user_space(vcpu, msr_index, KVM_EXIT_X86_WRMSR, data,
 				       complete_emulated_msr_access, r))
 			return X86EMUL_IO_NEEDED;
+
+		trace_kvm_msr_write_ex(msr_index, data);
 		return X86EMUL_PROPAGATE_FAULT;
 	}
 
+	trace_kvm_msr_write(msr_index, data);
 	return X86EMUL_CONTINUE;
 }
 
-- 
2.31.1