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/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 4bda61b..ac0f90e 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -771,6 +771,8 @@
 	bool (*mpx_supported)(void);
 
 	int (*check_nested_events)(struct kvm_vcpu *vcpu, bool external_intr);
+
+	void (*sched_in)(struct kvm_vcpu *kvm, int cpu);
 };
 
 struct kvm_arch_async_pf {