KVM: SVM: Move AVIC vCPU kicking snippet to helper function

Add a helper function to handle kicking non-running vCPUs when sending
virtual IPIs.  A future patch will change SVM's interception functions
to take @vcpu instead of @svm, at which piont declaring and modifying
'vcpu' in a case statement is confusing, and potentially dangerous.

No functional change intended.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210205005750.3841462-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/svm/avic.c

@@ -298,6 +298,23 @@ static int avic_init_backing_page(struct kvm_vcpu *vcpu)
 	return 0;
 }
 
+static void avic_kick_target_vcpus(struct kvm *kvm, struct kvm_lapic *source,
+				   u32 icrl, u32 icrh)
+{
+	struct kvm_vcpu *vcpu;
+	int i;
+
+	kvm_for_each_vcpu(i, vcpu, kvm) {
+		bool m = kvm_apic_match_dest(vcpu, source,
+					     icrl & APIC_SHORT_MASK,
+					     GET_APIC_DEST_FIELD(icrh),
+					     icrl & APIC_DEST_MASK);
+
+		if (m && !avic_vcpu_is_running(vcpu))
+			kvm_vcpu_wake_up(vcpu);
+	}
+}
+
 int avic_incomplete_ipi_interception(struct vcpu_svm *svm)
 {
 	u32 icrh = svm->vmcb->control.exit_info_1 >> 32;
@@ -324,28 +341,14 @@ int avic_incomplete_ipi_interception(struct vcpu_svm *svm)
 		kvm_lapic_reg_write(apic, APIC_ICR2, icrh);
 		kvm_lapic_reg_write(apic, APIC_ICR, icrl);
 		break;
-	case AVIC_IPI_FAILURE_TARGET_NOT_RUNNING: {
-		int i;
-		struct kvm_vcpu *vcpu;
-		struct kvm *kvm = svm->vcpu.kvm;
-		struct kvm_lapic *apic = svm->vcpu.arch.apic;
-
+	case AVIC_IPI_FAILURE_TARGET_NOT_RUNNING:
 		/*
 		 * At this point, we expect that the AVIC HW has already
 		 * set the appropriate IRR bits on the valid target
 		 * vcpus. So, we just need to kick the appropriate vcpu.
 		 */
-		kvm_for_each_vcpu(i, vcpu, kvm) {
-			bool m = kvm_apic_match_dest(vcpu, apic,
-						     icrl & APIC_SHORT_MASK,
-						     GET_APIC_DEST_FIELD(icrh),
-						     icrl & APIC_DEST_MASK);
-
-			if (m && !avic_vcpu_is_running(vcpu))
-				kvm_vcpu_wake_up(vcpu);
-		}
+		avic_kick_target_vcpus(svm->vcpu.kvm, apic, icrl, icrh);
 		break;
-	}
 	case AVIC_IPI_FAILURE_INVALID_TARGET:
 		WARN_ONCE(1, "Invalid IPI target: index=%u, vcpu=%d, icr=%#0x:%#0x\n",
 			  index, svm->vcpu.vcpu_id, icrh, icrl);