KVM: lapic: Split out x2apic ldr calculation

Split out the ldr calculation from kvm_apic_set_x2apic_id
since we're about to reuse it in the following patch.

Signed-off-by: Dr. David Alan Gilbert <[email protected]>
Cc: [email protected]
Signed-off-by: Paolo Bonzini <[email protected]>

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 943acbf00c69d8f423289116bc363159144f883a..e2edb110300251710bfddf1c75b162af7df42c79 100644 (file)
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -266,9 +266,14 @@ static inline void kvm_apic_set_ldr(struct kvm_lapic *apic, u32 id)
        recalculate_apic_map(apic->vcpu->kvm);
 }
 
+static inline u32 kvm_apic_calc_x2apic_ldr(u32 id)
+{
+       return ((id >> 4) << 16) | (1 << (id & 0xf));
+}
+
 static inline void kvm_apic_set_x2apic_id(struct kvm_lapic *apic, u32 id)
 {
-       u32 ldr = ((id >> 4) << 16) | (1 << (id & 0xf));
+       u32 ldr = kvm_apic_calc_x2apic_ldr(id);
 
        WARN_ON_ONCE(id != apic->vcpu->vcpu_id);