KVM: Protect update_cr8_intercept() when running without an apic

(cherry picked from commit 88c808fd)

update_cr8_intercept() can be triggered from userspace while there
is no apic present.
Signed-off-by: Avi Kivity <avi@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

arch/x86/kvm/x86.c

@@ -3202,6 +3202,9 @@ static void update_cr8_intercept(struct kvm_vcpu *vcpu)
 	if (!kvm_x86_ops->update_cr8_intercept)
 		return;
 
+	if (!vcpu->arch.apic)
+		return;
+
 	if (!vcpu->arch.apic->vapic_addr)
 		max_irr = kvm_lapic_find_highest_irr(vcpu);
 	else