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

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Date:   Thu, 28 Jul 2022 16:25:05 +0800
From:   "Hou Wenlong" <houwenlong.hwl@...group.com>
To:     kvm@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        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>,
        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 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 | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 8df89b9c212f..6e45b20ce9a4 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7908,12 +7908,16 @@ static int emulator_get_msr_with_filter(struct x86_emulate_ctxt *ctxt,
 	int r;
 
 	r = kvm_get_msr_with_filter(vcpu, msr_index, pdata);
-	if (r) {
+	if (!r) {
+		trace_kvm_msr_read(msr_index, *pdata);
+	} else {
 		if (kvm_msr_user_space(vcpu, msr_index, KVM_EXIT_X86_RDMSR, 0,
-				       complete_emulated_rdmsr, r))
+				       complete_emulated_rdmsr, r)) {
 			r = X86EMUL_IO_NEEDED;
-		else
+		} else {
+			trace_kvm_msr_read_ex(msr_index);
 			r = X86EMUL_UNHANDLEABLE;
+		}
 	}
 
 	return r;
@@ -7926,12 +7930,16 @@ static int emulator_set_msr_with_filter(struct x86_emulate_ctxt *ctxt,
 	int r;
 
 	r = kvm_set_msr_with_filter(vcpu, msr_index, data);
-	if (r > 0) {
+	if (!r) {
+		trace_kvm_msr_write(msr_index, data);
+	} else if (r > 0) {
 		if (kvm_msr_user_space(vcpu, msr_index, KVM_EXIT_X86_WRMSR, data,
-				       complete_emulated_msr_access, r))
+				       complete_emulated_msr_access, r)) {
 			r = X86EMUL_IO_NEEDED;
-		else
+		} else {
+			trace_kvm_msr_write_ex(msr_index, data);
 			r = X86EMUL_UNHANDLEABLE;
+		}
 	}
 
 	return r;
-- 
2.31.1