linux-kernel - [PATCH v3 10/12] KVM: SVM: remove svm_toggle_avic_for_irq

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Date:   Mon,  2 Aug 2021 21:33:27 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     kvm@...r.kernel.org
Cc:     Wanpeng Li <wanpengli@...cent.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Joerg Roedel <joro@...tes.org>, Borislav Petkov <bp@...en8.de>,
        Sean Christopherson <seanjc@...gle.com>,
        Jim Mattson <jmattson@...gle.com>,
        x86@...nel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
        linux-kernel@...r.kernel.org (open list:X86 ARCHITECTURE (32-BIT AND
        64-BIT)), Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Maxim Levitsky <mlevitsk@...hat.com>
Subject: [PATCH v3 10/12] KVM: SVM: remove svm_toggle_avic_for_irq_window

Now that kvm_request_apicv_update doesn't need to drop the kvm->srcu lock,
we can call kvm_request_apicv_update directly.

Signed-off-by: Maxim Levitsky <mlevitsk@...hat.com>
---
 arch/x86/kvm/svm/avic.c | 11 -----------
 arch/x86/kvm/svm/svm.c  |  4 ++--
 arch/x86/kvm/svm/svm.h  |  1 -
 3 files changed, 2 insertions(+), 14 deletions(-)

diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
index d0acbeeab3d6..1def54c26259 100644
--- a/arch/x86/kvm/svm/avic.c
+++ b/arch/x86/kvm/svm/avic.c
@@ -582,17 +582,6 @@ void avic_post_state_restore(struct kvm_vcpu *vcpu)
 	avic_handle_ldr_update(vcpu);
 }
 
-void svm_toggle_avic_for_irq_window(struct kvm_vcpu *vcpu, bool activate)
-{
-	if (!enable_apicv || !lapic_in_kernel(vcpu))
-		return;
-
-	srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
-	kvm_request_apicv_update(vcpu->kvm, activate,
-				 APICV_INHIBIT_REASON_IRQWIN);
-	vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
-}
-
 void svm_set_virtual_apic_mode(struct kvm_vcpu *vcpu)
 {
 	return;
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 3923d383face..c8827de49c75 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -2994,7 +2994,7 @@ static int interrupt_window_interception(struct kvm_vcpu *vcpu)
 	 * In this case AVIC was temporarily disabled for
 	 * requesting the IRQ window and we have to re-enable it.
 	 */
-	svm_toggle_avic_for_irq_window(vcpu, true);
+	kvm_request_apicv_update(vcpu->kvm, true, APICV_INHIBIT_REASON_IRQWIN);
 
 	++vcpu->stat.irq_window_exits;
 	return 1;
@@ -3546,7 +3546,7 @@ static void svm_enable_irq_window(struct kvm_vcpu *vcpu)
 		 * via AVIC. In such case, we need to temporarily disable AVIC,
 		 * and fallback to injecting IRQ via V_IRQ.
 		 */
-		svm_toggle_avic_for_irq_window(vcpu, false);
+		kvm_request_apicv_update(vcpu->kvm, false, APICV_INHIBIT_REASON_IRQWIN);
 		svm_set_vintr(svm);
 	}
 }
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index bd41f2a32838..aae851762b59 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -524,7 +524,6 @@ int avic_ga_log_notifier(u32 ga_tag);
 void avic_vm_destroy(struct kvm *kvm);
 int avic_vm_init(struct kvm *kvm);
 void avic_init_vmcb(struct vcpu_svm *svm);
-void svm_toggle_avic_for_irq_window(struct kvm_vcpu *vcpu, bool activate);
 int avic_incomplete_ipi_interception(struct kvm_vcpu *vcpu);
 int avic_unaccelerated_access_interception(struct kvm_vcpu *vcpu);
 int avic_init_vcpu(struct vcpu_svm *svm);
-- 
2.26.3