KVM: x86: introduce sched_in to kvm_x86_ops

sched_in preempt notifier is available for x86, allow its use in
specific virtualization technlogies as well.

Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 286c283..7c26533 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -8848,6 +8848,10 @@
 	return X86EMUL_CONTINUE;
 }
 
+void vmx_sched_in(struct kvm_vcpu *vcpu, int cpu)
+{
+}
+
 static struct kvm_x86_ops vmx_x86_ops = {
 	.cpu_has_kvm_support = cpu_has_kvm_support,
 	.disabled_by_bios = vmx_disabled_by_bios,
@@ -8952,6 +8956,8 @@
 	.mpx_supported = vmx_mpx_supported,
 
 	.check_nested_events = vmx_check_nested_events,
+
+	.sched_in = vmx_sched_in,
 };
 
 static int __init vmx_init(void)