Re: [PATCH] KVM: SVM: Add exception to disable objtool warning for kvm-amd.o

Re: [PATCH] KVM: SVM: Add exception to disable objtool warning for kvm-amd.o

[kernel test robot]

Hi Nikunj,

kernel test robot noticed the following build errors:

[auto build test ERROR on kvm/queue]
[also build test ERROR on mst-vhost/linux-next linus/master v6.5-rc5 next-20230809]
[cannot apply to kvm/linux-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Nikunj-A-Dadhania/KVM-SVM-Add-exception-to-disable-objtool-warning-for-kvm-amd-o/20230802-171219
base:   https://git.kernel.org/pub/scm/virt/kvm/kvm.git queue
patch link:    https://lore.kernel.org/r/20230802091107.1160320-1-nikunj%40amd.com
patch subject: [PATCH] KVM: SVM: Add exception to disable objtool warning for kvm-amd.o
config: i386-randconfig-i013-20230812 (https://download.01.org/0day-ci/archive/20230812/202308120845.gkEMVH5a-lkp@intel.com/config)
compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce: (https://download.01.org/0day-ci/archive/20230812/202308120845.gkEMVH5a-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308120845.gkEMVH5a-lkp@intel.com/

All errors (new ones prefixed by >>):

>> arch/x86/kvm/svm/vmenter.S:392:1: error: invalid instruction mnemonic 'stack_frame_non_standard_fp'
   STACK_FRAME_NON_STANDARD_FP(__svm_sev_es_vcpu_run)
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/stack_frame_non_standard_fp +392 arch/x86/kvm/svm/vmenter.S

   352	
   353		/* Clobbers RAX, RCX, RDX.  */
   354		RESTORE_HOST_SPEC_CTRL
   355	
   356		/*
   357		 * Mitigate RETBleed for AMD/Hygon Zen uarch. RET should be
   358		 * untrained as soon as we exit the VM and are back to the
   359		 * kernel. This should be done before re-enabling interrupts
   360		 * because interrupt handlers won't sanitize RET if the return is
   361		 * from the kernel.
   362		 */
   363		UNTRAIN_RET
   364	
   365		/* "Pop" @spec_ctrl_intercepted.  */
   366		pop %_ASM_BX
   367	
   368		pop %_ASM_BX
   369	
   370	#ifdef CONFIG_X86_64
   371		pop %r12
   372		pop %r13
   373		pop %r14
   374		pop %r15
   375	#else
   376		pop %esi
   377		pop %edi
   378	#endif
   379		pop %_ASM_BP
   380		RET
   381	
   382		RESTORE_GUEST_SPEC_CTRL_BODY
   383		RESTORE_HOST_SPEC_CTRL_BODY
   384	
   385	3:	cmpb $0, kvm_rebooting
   386		jne 2b
   387		ud2
   388	
   389		_ASM_EXTABLE(1b, 3b)
   390	
   391	SYM_FUNC_END(__svm_sev_es_vcpu_run)
 > 392	STACK_FRAME_NON_STANDARD_FP(__svm_sev_es_vcpu_run)

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki