Re: [PATCH v4 2/6] KVM: x86: Move guest_mode helpers to x86.h

[kernel test robot <lkp@intel.com>]

Hi Yosry,

kernel test robot noticed the following build errors:

[auto build test ERROR on 3d6cdcc8883b5726513d245eef0e91cabfc397f7]

url:    https://github.com/intel-lab-lkp/linux/commits/Yosry-Ahmed/KVM-x86-Move-enable_pmu-enable_mediated_pmu-to-pmu-h-and-pmu-c/20260326-191518
base:   3d6cdcc8883b5726513d245eef0e91cabfc397f7
patch link:    https://lore.kernel.org/r/20260326031150.3774017-3-yosry%40kernel.org
patch subject: [PATCH v4 2/6] KVM: x86: Move guest_mode helpers to x86.h
config: x86_64-buildonly-randconfig-004-20260327 (https://download.01.org/0day-ci/archive/20260327/202603270611.WB2i1rjQ-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260327/202603270611.WB2i1rjQ-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/202603270611.WB2i1rjQ-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/x86/kvm/svm/svm_onhyperv.c:11:
>> arch/x86/kvm/svm/svm.h:520:6: error: call to undeclared function 'is_guest_mode'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     520 |         if (is_guest_mode(&svm->vcpu))
         |             ^
   arch/x86/kvm/svm/svm.h:578:6: error: call to undeclared function 'is_guest_mode'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     578 |         if (is_guest_mode(&svm->vcpu) && !nested_vgif_enabled(svm))
         |             ^
   arch/x86/kvm/svm/svm.h:639:6: error: call to undeclared function 'is_guest_mode'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     639 |         if (is_guest_mode(&svm->vcpu))
         |             ^
   arch/x86/kvm/svm/svm.h:802:9: error: call to undeclared function 'is_guest_mode'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     802 |         return is_guest_mode(vcpu) && (svm->nested.ctl.int_ctl & V_INTR_MASKING_MASK);
         |                ^
   In file included from arch/x86/kvm/svm/svm_onhyperv.c:12:
   In file included from arch/x86/kvm/svm/svm_ops.h:7:
>> arch/x86/kvm/x86.h:169:20: error: conflicting types for 'is_guest_mode'
     169 | static inline bool is_guest_mode(struct kvm_vcpu *vcpu)
         |                    ^
   arch/x86/kvm/svm/svm.h:520:6: note: previous implicit declaration is here
     520 |         if (is_guest_mode(&svm->vcpu))
         |             ^
   5 errors generated.


vim +/is_guest_mode +520 arch/x86/kvm/svm/svm.h

0b97f929831a70 Sean Christopherson 2026-02-18  509  
0b97f929831a70 Sean Christopherson 2026-02-18  510  static inline void svm_mark_intercepts_dirty(struct vcpu_svm *svm)
0b97f929831a70 Sean Christopherson 2026-02-18  511  {
0b97f929831a70 Sean Christopherson 2026-02-18  512  	vmcb_mark_dirty(svm->vmcb01.ptr, VMCB_INTERCEPTS);
0b97f929831a70 Sean Christopherson 2026-02-18  513  
0b97f929831a70 Sean Christopherson 2026-02-18  514  	/*
0b97f929831a70 Sean Christopherson 2026-02-18  515  	 * If L2 is active, recalculate the intercepts for vmcb02 to account
0b97f929831a70 Sean Christopherson 2026-02-18  516  	 * for the changes made to vmcb01.  All intercept configuration is done
0b97f929831a70 Sean Christopherson 2026-02-18  517  	 * for vmcb01 and then propagated to vmcb02 to combine KVM's intercepts
0b97f929831a70 Sean Christopherson 2026-02-18  518  	 * with L1's intercepts (from the vmcb12 snapshot).
0b97f929831a70 Sean Christopherson 2026-02-18  519  	 */
0b97f929831a70 Sean Christopherson 2026-02-18 @520  	if (is_guest_mode(&svm->vcpu))
0b97f929831a70 Sean Christopherson 2026-02-18  521  		nested_vmcb02_recalc_intercepts(svm);
0b97f929831a70 Sean Christopherson 2026-02-18  522  }
0b97f929831a70 Sean Christopherson 2026-02-18  523  

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