KVM: x86: Introducing kvm_x86_ops.apicv_post_state_restore

Adding kvm_x86_ops hooks to allow APICv to do post state restore.
This is required to support VM save and restore feature.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 34c28c0..539675c 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1961,6 +1961,8 @@
 				1 : count_vectors(apic->regs + APIC_ISR);
 	apic->highest_isr_cache = -1;
 	if (vcpu->arch.apicv_active) {
+		if (kvm_x86_ops->apicv_post_state_restore)
+			kvm_x86_ops->apicv_post_state_restore(vcpu);
 		kvm_x86_ops->hwapic_irr_update(vcpu,
 				apic_find_highest_irr(apic));
 		kvm_x86_ops->hwapic_isr_update(vcpu->kvm,