[intel-tdx:huge_page_v2 194/204] arch/x86/kvm/../../../virt/kvm/guest_memfd.c:1447:3: error: call to undeclared function 'kvm_gmem_invalidate_begin'; ISO C99 and later do not support implicit function declarations

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

tree:   https://github.com/intel/tdx.git huge_page_v2
head:   0744d0b90629d528fa94ff73dce7ceeaaed1560c
commit: bee3734f98a1de8b3926f6706f5900750f5023fc [194/204] KVM: guest_memfd: Split for punch hole and private-to-shared conversion
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20250808/202508080344.qXKoVsWI-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
rustc: rustc 1.88.0 (6b00bc388 2025-06-23)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250808/202508080344.qXKoVsWI-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/202508080344.qXKoVsWI-lkp@intel.com/

All errors (new ones prefixed by >>):

>> arch/x86/kvm/../../../virt/kvm/guest_memfd.c:1447:3: error: call to undeclared function 'kvm_gmem_invalidate_begin'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    1447 |                 kvm_gmem_invalidate_begin(gmem, start, end);
         |                 ^
   arch/x86/kvm/../../../virt/kvm/guest_memfd.c:1447:3: note: did you mean 'kvm_mmu_invalidate_begin'?
   include/linux/kvm_host.h:1537:6: note: 'kvm_mmu_invalidate_begin' declared here
    1537 | void kvm_mmu_invalidate_begin(struct kvm *kvm);
         |      ^
>> arch/x86/kvm/../../../virt/kvm/guest_memfd.c:1451:9: error: call to undeclared function 'kvm_gmem_split_private'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    1451 |                 ret = kvm_gmem_split_private(gmem, start, end);
         |                       ^
   arch/x86/kvm/../../../virt/kvm/guest_memfd.c:1451:9: note: did you mean 'kvm_gmem_is_private'?
   include/linux/kvm_host.h:2512:20: note: 'kvm_gmem_is_private' declared here
    2512 | static inline bool kvm_gmem_is_private(struct kvm_memory_slot *slot, gfn_t gfn)
         |                    ^
>> arch/x86/kvm/../../../virt/kvm/guest_memfd.c:1467:3: error: call to undeclared function 'kvm_gmem_zap'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    1467 |                 kvm_gmem_zap(gmem, start, end, filter);
         |                 ^
   arch/x86/kvm/../../../virt/kvm/guest_memfd.c:1598:2: error: call to undeclared function 'kvm_gmem_invalidate_begin'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    1598 |         kvm_gmem_invalidate_begin(gmem, 0, -1ul);
         |         ^
   arch/x86/kvm/../../../virt/kvm/guest_memfd.c:1599:2: error: call to undeclared function 'kvm_gmem_zap'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    1599 |         kvm_gmem_zap(gmem, 0, -1ul, KVM_FILTER_PRIVATE | KVM_FILTER_SHARED);
         |         ^
   arch/x86/kvm/../../../virt/kvm/guest_memfd.c:1770:15: warning: variable 'argp' set but not used [-Wunused-but-set-variable]
    1770 |         void __user *argp;
         |                      ^
   arch/x86/kvm/../../../virt/kvm/guest_memfd.c:1933:3: error: call to undeclared function 'kvm_gmem_invalidate_begin'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    1933 |                 kvm_gmem_invalidate_begin(gmem, start, end);
         |                 ^
   arch/x86/kvm/../../../virt/kvm/guest_memfd.c:1935:3: error: call to undeclared function 'kvm_gmem_zap'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    1935 |                 kvm_gmem_zap(gmem, start, end, filter);
         |                 ^
   1 warning and 7 errors generated.


vim +/kvm_gmem_invalidate_begin +1447 arch/x86/kvm/../../../virt/kvm/guest_memfd.c

  1431	
  1432	static long kvm_gmem_punch_hole(struct inode *inode, loff_t offset, loff_t len)
  1433	{
  1434		struct list_head *gmem_list = &inode->i_mapping->i_private_list;
  1435		pgoff_t start = offset >> PAGE_SHIFT;
  1436		pgoff_t end = (offset + len) >> PAGE_SHIFT;
  1437		struct kvm_gmem *gmem;
  1438		long ret;
  1439	
  1440		/*
  1441		 * Bindings must be stable across invalidation to ensure the start+end
  1442		 * are balanced.
  1443		 */
  1444		filemap_invalidate_lock(inode->i_mapping);
  1445	
  1446		list_for_each_entry(gmem, gmem_list, entry)
> 1447			kvm_gmem_invalidate_begin(gmem, start, end);
  1448	
  1449		ret = 0;
  1450		list_for_each_entry(gmem, gmem_list, entry) {
> 1451			ret = kvm_gmem_split_private(gmem, start, end);
  1452			if (ret)
  1453				goto out;
  1454		}
  1455		list_for_each_entry(gmem, gmem_list, entry) {
  1456			enum kvm_gfn_range_filter filter;
  1457	
  1458			/*
  1459			 * kvm_gmem_invalidate_begin() would have unmapped shared
  1460			 * mappings via mmu notifiers, but only if those mappings were
  1461			 * actually set up. Since guest_memfd cannot assume that shared
  1462			 * mappings were set up, zap both private and shared mappings
  1463			 * here. If shared mappings were zapped, this should not be
  1464			 * expensive.
  1465			 */
  1466			filter = KVM_FILTER_PRIVATE | KVM_FILTER_SHARED;
> 1467			kvm_gmem_zap(gmem, start, end, filter);
  1468		}
  1469		if (kvm_gmem_has_custom_allocator(inode)) {
  1470			ret = kvm_gmem_truncate_inode_range(inode, offset, offset + len);
  1471		} else {
  1472			/* Page size is PAGE_SIZE, so use optimized truncation function. */
  1473			truncate_inode_pages_range(inode->i_mapping, offset, offset + len - 1);
  1474		}
  1475	
  1476	out:
  1477		list_for_each_entry(gmem, gmem_list, entry)
  1478			kvm_gmem_invalidate_end(gmem, start, end);
  1479	
  1480		filemap_invalidate_unlock(inode->i_mapping);
  1481	
  1482		return ret;
  1483	}
  1484	

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