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Subject: Re: [PATCH] KVM: SVM: Add tracepoint for cr_interception
From:   Haiwei Li <lihaiwei.kernel@gmail.com>
To:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "kvm@vger.kernel.org" <kvm@vger.kernel.org>,
        "x86@kernel.org" <x86@kernel.org>
Cc:     "hpa@zytor.com" <hpa@zytor.com>, "bp@alien8.de" <bp@alien8.de>,
        "mingo@redhat.com" <mingo@redhat.com>,
        "tglx@linutronix.de" <tglx@linutronix.de>, joro@8bytes.org,
        "jmattson@google.com" <jmattson@google.com>,
        "wanpengli@tencent.com" <wanpengli@tencent.com>,
        vkuznets@redhat.com, sean.j.christopherson@intel.com,
        "pbonzini@redhat.com" <pbonzini@redhat.com>
References: <f3031602-db3b-c4fe-b719-d402663b0a2b@gmail.com>
Message-ID: <040bf07b-dcc5-df99-d720-a2ed2298a2e3@gmail.com>
Date:   Wed, 23 Sep 2020 14:24:23 +0800
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Kindly ping. :)
On 20/9/4 19:25, Haiwei Li wrote:
> From: Haiwei Li <lihaiwei@tencent.com>
> 
> Add trace_kvm_cr_write and trace_kvm_cr_read for svm.
> 
> Signed-off-by: Haiwei Li <lihaiwei@tencent.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