linux-kernel - [PATCH] KVM: SVM: Add tracepoint for cr

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Message-ID: <f3031602-db3b-c4fe-b719-d402663b0a2b@gmail.com>
Date:   Fri, 4 Sep 2020 19:25:29 +0800
From:   Haiwei Li <lihaiwei.kernel@...il.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>
Cc:     "hpa@...or.com" <hpa@...or.com>, "bp@...en8.de" <bp@...en8.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>, joro@...tes.org,
        "jmattson@...gle.com" <jmattson@...gle.com>,
        "wanpengli@...cent.com" <wanpengli@...cent.com>,
        vkuznets@...hat.com, sean.j.christopherson@...el.com,
        "pbonzini@...hat.com" <pbonzini@...hat.com>
Subject: [PATCH] KVM: SVM: Add tracepoint for cr_interception

From: Haiwei Li <lihaiwei@...cent.com>

Add trace_kvm_cr_write and trace_kvm_cr_read for svm.

Signed-off-by: Haiwei Li <lihaiwei@...cent.com>
---
  arch/x86/kvm/svm/svm.c | 2 ++
  1 file changed, 2 insertions(+)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 03dd7bac8034..2c6dea48ba62 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -2261,6 +2261,7 @@ static int cr_interception(struct vcpu_svm *svm)
  	if (cr >= 16) { /* mov to cr */
  		cr -= 16;
  		val = kvm_register_read(&svm->vcpu, reg);
+		trace_kvm_cr_write(cr, val);
  		switch (cr) {
  		case 0:
  			if (!check_selective_cr0_intercepted(svm, val))
@@ -2306,6 +2307,7 @@ static int cr_interception(struct vcpu_svm *svm)
  			return 1;
  		}
  		kvm_register_write(&svm->vcpu, reg, val);
+		trace_kvm_cr_read(cr, val);
  	}
  	return kvm_complete_insn_gp(&svm->vcpu, err);
  }
--
2.18.4