linux-kernel - [RFC PATCH 04/13] KVM: SVM: Only call vcpu

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Date:   Sun, 20 Feb 2022 20:19:13 -0600
From:   Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To:     <linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>
CC:     <pbonzini@...hat.com>, <seanjc@...gle.com>, <joro@...tes.org>,
        <jon.grimm@....com>, <wei.huang2@....com>, <terry.bowman@....com>,
        "Suravee Suthikulpanit" <suravee.suthikulpanit@....com>
Subject: [RFC PATCH 04/13] KVM: SVM: Only call vcpu_(un)blocking when AVIC is enabled.

The kvm_x86_ops.vcpu_(un)blocking are needed by AVIC only.
Therefore, set the ops only when AVIC is enabled.

Suggested-by: Sean Christopherson <seanjc@...gle.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
---
 arch/x86/kvm/svm/avic.c | 12 ++++++++++--
 arch/x86/kvm/svm/svm.c  |  7 -------
 arch/x86/kvm/svm/svm.h  |  2 --
 3 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
index abde08ca23ab..0040824e4376 100644
--- a/arch/x86/kvm/svm/avic.c
+++ b/arch/x86/kvm/svm/avic.c
@@ -996,7 +996,7 @@ void avic_vcpu_put(struct kvm_vcpu *vcpu)
 	WRITE_ONCE(*(svm->avic_physical_id_cache), entry);
 }
 
-void avic_vcpu_blocking(struct kvm_vcpu *vcpu)
+static void avic_vcpu_blocking(struct kvm_vcpu *vcpu)
 {
 	if (!kvm_vcpu_apicv_active(vcpu))
 		return;
@@ -1021,7 +1021,7 @@ void avic_vcpu_blocking(struct kvm_vcpu *vcpu)
 	preempt_enable();
 }
 
-void avic_vcpu_unblocking(struct kvm_vcpu *vcpu)
+static void avic_vcpu_unblocking(struct kvm_vcpu *vcpu)
 {
 	int cpu;
 
@@ -1057,6 +1057,14 @@ bool avic_hardware_setup(struct kvm_x86_ops *x86_ops)
 		pr_info("x2AVIC enabled\n");
 	}
 
+	if (avic_mode) {
+		x86_ops->vcpu_blocking = avic_vcpu_blocking;
+		x86_ops->vcpu_unblocking = avic_vcpu_unblocking;
+	} else {
+		x86_ops->vcpu_blocking = NULL;
+		x86_ops->vcpu_unblocking = NULL;
+	}
+
 	amd_iommu_register_ga_log_notifier(&avic_ga_log_notifier);
 	return !!avic_mode;
 }
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 3048f4b758d6..3687026f2859 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -4531,8 +4531,6 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
 	.prepare_guest_switch = svm_prepare_guest_switch,
 	.vcpu_load = svm_vcpu_load,
 	.vcpu_put = svm_vcpu_put,
-	.vcpu_blocking = avic_vcpu_blocking,
-	.vcpu_unblocking = avic_vcpu_unblocking,
 
 	.update_exception_bitmap = svm_update_exception_bitmap,
 	.get_msr_feature = svm_get_msr_feature,
@@ -4819,11 +4817,6 @@ static __init int svm_hardware_setup(void)
 
 	enable_apicv = avic = avic && avic_hardware_setup(&svm_x86_ops);
 
-	if (!enable_apicv) {
-		svm_x86_ops.vcpu_blocking = NULL;
-		svm_x86_ops.vcpu_unblocking = NULL;
-	}
-
 	if (vls) {
 		if (!npt_enabled ||
 		    !boot_cpu_has(X86_FEATURE_V_VMSAVE_VMLOAD) ||
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index b53c83a44ec2..1a0bf6b853df 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -578,8 +578,6 @@ void svm_hwapic_isr_update(struct kvm_vcpu *vcpu, int max_isr);
 bool svm_dy_apicv_has_pending_interrupt(struct kvm_vcpu *vcpu);
 int svm_update_pi_irte(struct kvm *kvm, unsigned int host_irq,
 		       uint32_t guest_irq, bool set);
-void avic_vcpu_blocking(struct kvm_vcpu *vcpu);
-void avic_vcpu_unblocking(struct kvm_vcpu *vcpu);
 void avic_ring_doorbell(struct kvm_vcpu *vcpu);
 
 /* sev.c */
-- 
2.25.1