Re: [PATCH v9 10/17] KVM: x86: Compute max_mapping_level with input from guest_memfd

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

Hi Fuad,

kernel test robot noticed the following build errors:

[auto build test ERROR on 82f2b0b97b36ee3fcddf0f0780a9a0825d52fec3]

url:    https://github.com/intel-lab-lkp/linux/commits/Fuad-Tabba/KVM-Rename-CONFIG_KVM_PRIVATE_MEM-to-CONFIG_KVM_GMEM/20250514-003900
base:   82f2b0b97b36ee3fcddf0f0780a9a0825d52fec3
patch link:    https://lore.kernel.org/r/20250513163438.3942405-11-tabba%40google.com
patch subject: [PATCH v9 10/17] KVM: x86: Compute max_mapping_level with input from guest_memfd
config: x86_64-buildonly-randconfig-002-20250514 (https://download.01.org/0day-ci/archive/20250514/202505142334.6dQb5Sei-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250514/202505142334.6dQb5Sei-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/202505142334.6dQb5Sei-lkp@intel.com/

All errors (new ones prefixed by >>):

   arch/x86/kvm/mmu/mmu.c: In function 'kvm_mmu_max_mapping_level':
>> arch/x86/kvm/mmu/mmu.c:3315:14: error: implicit declaration of function 'kvm_get_memory_attributes' [-Werror=implicit-function-declaration]
    3315 |              kvm_get_memory_attributes(kvm, gfn) & KVM_MEMORY_ATTRIBUTE_PRIVATE)) {
         |              ^~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/kvm_get_memory_attributes +3315 arch/x86/kvm/mmu/mmu.c

  3303	
  3304	int kvm_mmu_max_mapping_level(struct kvm *kvm,
  3305				      const struct kvm_memory_slot *slot, gfn_t gfn)
  3306	{
  3307		int max_level;
  3308	
  3309		max_level = kvm_lpage_info_max_mapping_level(kvm, slot, gfn, PG_LEVEL_NUM);
  3310		if (max_level == PG_LEVEL_4K)
  3311			return PG_LEVEL_4K;
  3312	
  3313		if (kvm_slot_has_gmem(slot) &&
  3314		    (kvm_gmem_memslot_supports_shared(slot) ||
> 3315		     kvm_get_memory_attributes(kvm, gfn) & KVM_MEMORY_ATTRIBUTE_PRIVATE)) {
  3316			return kvm_gmem_max_mapping_level(slot, gfn, max_level);
  3317		}
  3318	
  3319		return min(max_level, host_pfn_mapping_level(kvm, gfn, slot));
  3320	}
  3321	

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