x86/apic: KVM: Move apic_test)vector() to common code

Move apic_test_vector() to apic.h in order to reuse it in the Secure AVIC
guest APIC driver in later patches to test vector state in the APIC
backing page.

No functional change intended.

Signed-off-by: Neeraj Upadhyay <Neeraj.Upadhyay@amd.com>
Acked-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20250709033242.267892-14-Neeraj.Upadhyay@amd.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

Author: neerajupadhya

arch/x86/include/asm/apic.h

@@ -557,6 +557,11 @@ static inline void apic_set_vector(int vec, void *bitmap)
 	set_bit(APIC_VECTOR_TO_BIT_NUMBER(vec), bitmap + APIC_VECTOR_TO_REG_OFFSET(vec));
 }
 
+static inline int apic_test_vector(int vec, void *bitmap)
+{
+	return test_bit(APIC_VECTOR_TO_BIT_NUMBER(vec), bitmap + APIC_VECTOR_TO_REG_OFFSET(vec));
+}
+
 /*
  * Warm reset vector position:
  */

arch/x86/kvm/lapic.c

@@ -93,11 +93,6 @@ static __always_inline void kvm_lapic_set_reg64(struct kvm_lapic *apic,
 	apic_set_reg64(apic->regs, reg, val);
 }
 
-static inline int apic_test_vector(int vec, void *bitmap)
-{
-	return test_bit(APIC_VECTOR_TO_BIT_NUMBER(vec), bitmap + APIC_VECTOR_TO_REG_OFFSET(vec));
-}
-
 bool kvm_apic_pending_eoi(struct kvm_vcpu *vcpu, int vector)
 {
 	struct kvm_lapic *apic = vcpu->arch.apic;