[linux-next:master 11918/14131] arch/x86/xen/smp_pv.c:350: undefined reference to `xen_asm_exc_xen_hypervisor_callback'

[linux-next:master 11918/14131] arch/x86/xen/smp_pv.c:350: undefined reference to `xen_asm_exc_xen_hypervisor_callback'

[kbuild test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   e7b08814b16b80a0bf76eeca16317f8c2ed23b8c
commit: 66a07b44e7658da3145bb3a8f45256d103e3addc [11918/14131] x86/entry: Switch XEN/PV hypercall entry to IDTENTRY
config: i386-debian-10.3 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-13) 9.3.0
reproduce (this is a W=1 build):
        git checkout 66a07b44e7658da3145bb3a8f45256d103e3addc
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@intel.com>

All errors (new ones prefixed by >>, old ones prefixed by <<):

ld: arch/x86/xen/setup.o: in function `register_callback':
arch/x86/xen/setup.c:940: undefined reference to `xen_asm_exc_xen_hypervisor_callback'
ld: arch/x86/xen/smp_pv.o: in function `cpu_initialize_context':
>> arch/x86/xen/smp_pv.c:350: undefined reference to `xen_asm_exc_xen_hypervisor_callback'

vim +350 arch/x86/xen/smp_pv.c

83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  284  
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  285  static int
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  286  cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  287  {
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  288  	struct vcpu_guest_context *ctxt;
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  289  	struct desc_struct *gdt;
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  290  	unsigned long gdt_mfn;
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  291  
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  292  	/* used to tell cpu_init() that it can proceed with initialization */
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  293  	cpumask_set_cpu(cpu, cpu_callout_mask);
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  294  	if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map))
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  295  		return 0;
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  296  
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  297  	ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  298  	if (ctxt == NULL)
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  299  		return -ENOMEM;
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  300  
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  301  	gdt = get_cpu_gdt_rw(cpu);
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  302  
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  303  #ifdef CONFIG_X86_32
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  304  	ctxt->user_regs.fs = __KERNEL_PERCPU;
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  305  	ctxt->user_regs.gs = __KERNEL_STACK_CANARY;
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  306  #endif
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  307  	memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  308  
f16b3da1dc936c Andy Lutomirski  2017-11-02  309  	/*
f16b3da1dc936c Andy Lutomirski  2017-11-02  310  	 * Bring up the CPU in cpu_bringup_and_idle() with the stack
f16b3da1dc936c Andy Lutomirski  2017-11-02  311  	 * pointing just below where pt_regs would be if it were a normal
f16b3da1dc936c Andy Lutomirski  2017-11-02  312  	 * kernel entry.
f16b3da1dc936c Andy Lutomirski  2017-11-02  313  	 */
c3881eb58d5611 Miroslav Benes   2020-03-26  314  	ctxt->user_regs.eip = (unsigned long)asm_cpu_bringup_and_idle;
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  315  	ctxt->flags = VGCF_IN_KERNEL;
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  316  	ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  317  	ctxt->user_regs.ds = __USER_DS;
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  318  	ctxt->user_regs.es = __USER_DS;
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  319  	ctxt->user_regs.ss = __KERNEL_DS;
f16b3da1dc936c Andy Lutomirski  2017-11-02  320  	ctxt->user_regs.cs = __KERNEL_CS;
f16b3da1dc936c Andy Lutomirski  2017-11-02  321  	ctxt->user_regs.esp = (unsigned long)task_pt_regs(idle);
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  322  
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  323  	xen_copy_trap_info(ctxt->trap_ctxt);
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  324  
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  325  	ctxt->ldt_ents = 0;
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  326  
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  327  	BUG_ON((unsigned long)gdt & ~PAGE_MASK);
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  328  
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  329  	gdt_mfn = arbitrary_virt_to_mfn(gdt);
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  330  	make_lowmem_page_readonly(gdt);
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  331  	make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  332  
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  333  	ctxt->gdt_frames[0] = gdt_mfn;
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  334  	ctxt->gdt_ents      = GDT_ENTRIES;
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  335  
f16b3da1dc936c Andy Lutomirski  2017-11-02  336  	/*
f16b3da1dc936c Andy Lutomirski  2017-11-02  337  	 * Set SS:SP that Xen will use when entering guest kernel mode
f16b3da1dc936c Andy Lutomirski  2017-11-02  338  	 * from guest user mode.  Subsequent calls to load_sp0() can
f16b3da1dc936c Andy Lutomirski  2017-11-02  339  	 * change this value.
f16b3da1dc936c Andy Lutomirski  2017-11-02  340  	 */
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  341  	ctxt->kernel_ss = __KERNEL_DS;
f16b3da1dc936c Andy Lutomirski  2017-11-02  342  	ctxt->kernel_sp = task_top_of_stack(idle);
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  343  
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  344  #ifdef CONFIG_X86_32
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  345  	ctxt->event_callback_cs     = __KERNEL_CS;
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  346  	ctxt->failsafe_callback_cs  = __KERNEL_CS;
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  347  #else
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  348  	ctxt->gs_base_kernel = per_cpu_offset(cpu);
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  349  #endif
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14 @350  	ctxt->event_callback_eip    =
66a07b44e7658d Thomas Gleixner  2020-05-21  351  		(unsigned long)xen_asm_exc_xen_hypervisor_callback;
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  352  	ctxt->failsafe_callback_eip =
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  353  		(unsigned long)xen_failsafe_callback;
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  354  	per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir);
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  355  
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  356  	ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_gfn(swapper_pg_dir));
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  357  	if (HYPERVISOR_vcpu_op(VCPUOP_initialise, xen_vcpu_nr(cpu), ctxt))
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  358  		BUG();
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  359  
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  360  	kfree(ctxt);
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  361  	return 0;
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  362  }
83b96794e0ea97 Vitaly Kuznetsov 2017-03-14  363  

:::::: The code at line 350 was first introduced by commit
:::::: 83b96794e0ea97ca7e05b15e31d31dac71d3fc2a x86/xen: split off smp_pv.c

:::::: TO: Vitaly Kuznetsov <vkuznets@redhat.com>
:::::: CC: Juergen Gross <jgross@suse.com>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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