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[18.162.59.208]) by smtp.gmail.com with ESMTPSA id q70sm5129650pja.39.2020.12.10.00.15.27 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 10 Dec 2020 00:15:30 -0800 (PST) From: Stephen Zhang To: pbonzini@redhat.com, seanjc@google.com, vkuznets@redhat.com, wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Stephen Zhang Subject: [PATCH] kvm:vmx:code changes in handle_io() to save some CPU cycles. Date: Thu, 10 Dec 2020 16:15:15 +0800 Message-Id: <1607588115-29971-1-git-send-email-starzhangzsd@gmail.com> X-Mailer: git-send-email 1.8.3.1 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org code changes in handle_io() to save some CPU cycles. Signed-off-by: Stephen Zhang --- arch/x86/kvm/vmx/vmx.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 47b8357..109bcf64 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -4899,15 +4899,14 @@ static int handle_triple_fault(struct kvm_vcpu *vcpu) static int handle_io(struct kvm_vcpu *vcpu) { unsigned long exit_qualification; - int size, in, string; + int size, in; unsigned port; exit_qualification = vmx_get_exit_qual(vcpu); - string = (exit_qualification & 16) != 0; ++vcpu->stat.io_exits; - if (string) + if (exit_qualification & 16) return kvm_emulate_instruction(vcpu, 0); port = exit_qualification >> 16; -- 1.8.3.1