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([2001:b07:6468:f312:c8dd:75d4:99ab:290a]) by smtp.gmail.com with ESMTPSA id f19sm1768437edu.12.2021.04.22.03.35.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 22 Apr 2021 03:35:59 -0700 (PDT) Subject: Re: [PATCH] KVM: x86: Take advantage of kvm_arch_dy_has_pending_interrupt() To: lihaiwei.kernel@gmail.com, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: seanjc@google.com, vkuznets@redhat.com, wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org, Haiwei Li References: <20210421032513.1921-1-lihaiwei.kernel@gmail.com> From: Paolo Bonzini Message-ID: <2c1c0771-5ff7-03e9-53e3-ee7b2cfe63a6@redhat.com> Date: Thu, 22 Apr 2021 12:35:58 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.0 MIME-Version: 1.0 In-Reply-To: <20210421032513.1921-1-lihaiwei.kernel@gmail.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 21/04/21 05:25, lihaiwei.kernel@gmail.com wrote: > From: Haiwei Li > > `kvm_arch_dy_runnable` checks the pending_interrupt as the code in > `kvm_arch_dy_has_pending_interrupt`. So take advantage of it. > > Signed-off-by: Haiwei Li > --- > arch/x86/kvm/x86.c | 21 +++++++++------------ > 1 file changed, 9 insertions(+), 12 deletions(-) > > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > index d696a9f..08bd616 100644 > --- a/arch/x86/kvm/x86.c > +++ b/arch/x86/kvm/x86.c > @@ -11125,28 +11125,25 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) > return kvm_vcpu_running(vcpu) || kvm_vcpu_has_events(vcpu); > } > > -bool kvm_arch_dy_runnable(struct kvm_vcpu *vcpu) > +bool kvm_arch_dy_has_pending_interrupt(struct kvm_vcpu *vcpu) > { > - if (READ_ONCE(vcpu->arch.pv.pv_unhalted)) > - return true; > - > - if (kvm_test_request(KVM_REQ_NMI, vcpu) || > - kvm_test_request(KVM_REQ_SMI, vcpu) || > - kvm_test_request(KVM_REQ_EVENT, vcpu)) > - return true; > - > if (vcpu->arch.apicv_active && static_call(kvm_x86_dy_apicv_has_pending_interrupt)(vcpu)) > return true; > > return false; > } > > -bool kvm_arch_dy_has_pending_interrupt(struct kvm_vcpu *vcpu) > +bool kvm_arch_dy_runnable(struct kvm_vcpu *vcpu) > { > - if (vcpu->arch.apicv_active && static_call(kvm_x86_dy_apicv_has_pending_interrupt)(vcpu)) > + if (READ_ONCE(vcpu->arch.pv.pv_unhalted)) > return true; > > - return false; > + if (kvm_test_request(KVM_REQ_NMI, vcpu) || > + kvm_test_request(KVM_REQ_SMI, vcpu) || > + kvm_test_request(KVM_REQ_EVENT, vcpu)) > + return true; > + > + return kvm_arch_dy_has_pending_interrupt(vcpu); > } > > bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu) > Looks good, but I'd like to take a look at the other patches for directed yield first. Thanks! Paolo