KVM: VMX: extract kvm_cpu_vmxoff() from hardware_disable()

Along with some comments on why it is different from the core cpu_vmxoff()
function.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/kvm/vmx.c

@@ -1091,11 +1091,20 @@ static void vmclear_local_vcpus(void)
 		__vcpu_clear(vmx);
 }
 
+
+/* Just like cpu_vmxoff(), but with the __kvm_handle_fault_on_reboot()
+ * tricks.
+ */
+static void kvm_cpu_vmxoff(void)
+{
+	asm volatile (__ex(ASM_VMX_VMXOFF) : : : "cc");
+	write_cr4(read_cr4() & ~X86_CR4_VMXE);
+}
+
 static void hardware_disable(void *garbage)
 {
 	vmclear_local_vcpus();
-	asm volatile (__ex(ASM_VMX_VMXOFF) : : : "cc");
-	write_cr4(read_cr4() & ~X86_CR4_VMXE);
+	kvm_cpu_vmxoff();
 }
 
 static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt,