linux-kernel - [PATCH v4 14/16] KVM: SVM: move check for kvm_vcpu_apicv_active outside of avic_vcpu

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Date:   Tue, 10 Aug 2021 23:52:49 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     kvm@...r.kernel.org
Cc:     Jim Mattson <jmattson@...gle.com>, linux-kernel@...r.kernel.org,
        Wanpeng Li <wanpengli@...cent.com>,
        Borislav Petkov <bp@...en8.de>, Joerg Roedel <joro@...tes.org>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        x86@...nel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
        Maxim Levitsky <mlevitsk@...hat.com>
Subject: [PATCH v4 14/16] KVM: SVM: move check for kvm_vcpu_apicv_active outside of avic_vcpu_{put|load}

No functional change intended.

Signed-off-by: Maxim Levitsky <mlevitsk@...hat.com>
---
 arch/x86/kvm/svm/avic.c | 10 ++++------
 arch/x86/kvm/svm/svm.c  |  7 +++++--
 2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
index 1def54c26259..e7728b16a46f 100644
--- a/arch/x86/kvm/svm/avic.c
+++ b/arch/x86/kvm/svm/avic.c
@@ -940,9 +940,6 @@ void avic_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 	int h_physical_id = kvm_cpu_get_apicid(cpu);
 	struct vcpu_svm *svm = to_svm(vcpu);
 
-	if (!kvm_vcpu_apicv_active(vcpu))
-		return;
-
 	/*
 	 * Since the host physical APIC id is 8 bits,
 	 * we can support host APIC ID upto 255.
@@ -970,9 +967,6 @@ void avic_vcpu_put(struct kvm_vcpu *vcpu)
 	u64 entry;
 	struct vcpu_svm *svm = to_svm(vcpu);
 
-	if (!kvm_vcpu_apicv_active(vcpu))
-		return;
-
 	entry = READ_ONCE(*(svm->avic_physical_id_cache));
 	if (entry & AVIC_PHYSICAL_ID_ENTRY_IS_RUNNING_MASK)
 		avic_update_iommu_vcpu_affinity(vcpu, -1, 0);
@@ -989,6 +983,10 @@ static void avic_set_running(struct kvm_vcpu *vcpu, bool is_run)
 	struct vcpu_svm *svm = to_svm(vcpu);
 
 	svm->avic_is_running = is_run;
+
+	if (!kvm_vcpu_apicv_active(vcpu))
+		return;
+
 	if (is_run)
 		avic_vcpu_load(vcpu, vcpu->cpu);
 	else
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 1da12d700436..700bc188a650 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -1483,12 +1483,15 @@ static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 		sd->current_vmcb = svm->vmcb;
 		indirect_branch_prediction_barrier();
 	}
-	avic_vcpu_load(vcpu, cpu);
+	if (kvm_vcpu_apicv_active(vcpu))
+		avic_vcpu_load(vcpu, cpu);
 }
 
 static void svm_vcpu_put(struct kvm_vcpu *vcpu)
 {
-	avic_vcpu_put(vcpu);
+	if (kvm_vcpu_apicv_active(vcpu))
+		avic_vcpu_put(vcpu);
+
 	svm_prepare_host_switch(vcpu);
 
 	++vcpu->stat.host_state_reload;
-- 
2.26.3