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Tue, 22 Sep 2020 23:24:33 -0700 (PDT) Subject: Re: [PATCH] KVM: SVM: Add tracepoint for cr_interception From: Haiwei Li To: "linux-kernel@vger.kernel.org" , "kvm@vger.kernel.org" , "x86@kernel.org" Cc: "hpa@zytor.com" , "bp@alien8.de" , "mingo@redhat.com" , "tglx@linutronix.de" , joro@8bytes.org, "jmattson@google.com" , "wanpengli@tencent.com" , vkuznets@redhat.com, sean.j.christopherson@intel.com, "pbonzini@redhat.com" References: Message-ID: <040bf07b-dcc5-df99-d720-a2ed2298a2e3@gmail.com> Date: Wed, 23 Sep 2020 14:24:23 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.2.2 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Kindly ping. :) On 20/9/4 19:25, Haiwei Li wrote: > From: Haiwei Li > > Add trace_kvm_cr_write and trace_kvm_cr_read for svm. > > Signed-off-by: Haiwei Li > --- >  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