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Returns a folio with > + * refcount of 2: 1 after allocation, and 1 taken by the filemap. > + */ > +static struct folio *kvm_gmem_hugetlb_alloc_and_cache_folio(struct inode *inode, > + pgoff_t index) > +{ > + struct kvm_gmem_hugetlb *hgmem; > + pgoff_t aligned_index; > + struct folio *folio; > + int nr_pages; > + int ret; > + > + hgmem = kvm_gmem_hgmem(inode); > + folio = kvm_gmem_hugetlb_alloc_folio(hgmem->h, hgmem->spool); > + if (IS_ERR(folio)) > + return folio; > + > + nr_pages = 1UL << huge_page_order(hgmem->h); > + aligned_index = round_down(index, nr_pages); Maybe a gap here. When a guest_memfd is bound to a slot where slot->base_gfn is not aligned to 2M/1G and slot->gmem.pgoff is 0, even if an index is 2M/1G aligned, the corresponding GFN is not 2M/1G aligned. However, TDX requires that private huge pages be 2M aligned in GFN. > + ret = kvm_gmem_hugetlb_filemap_add_folio(inode->i_mapping, folio, > + aligned_index, > + htlb_alloc_mask(hgmem->h)); > + WARN_ON(ret); > + > spin_lock(&inode->i_lock); > inode->i_blocks += blocks_per_huge_page(hgmem->h); > spin_unlock(&inode->i_lock); > > - return page_folio(requested_page); > + return folio; > +}