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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Aug 04, 2025 at 03:42:42PM +0300, Leon Romanovsky wrote: > From: Leon Romanovsky > > Convert the KMSAN DMA handling function from page-based to physical > address-based interface. > > The refactoring renames kmsan_handle_dma() parameters from accepting > (struct page *page, size_t offset, size_t size) to (phys_addr_t phys, > size_t size). A PFN_VALID check is added to prevent KMSAN operations > on non-page memory, preventing from non struct page backed address, > > As part of this change, support for highmem addresses is implemented > using kmap_local_page() to handle both lowmem and highmem regions > properly. All callers throughout the codebase are updated to use the > new phys_addr_t based interface. Use the function Matthew pointed at kmap_local_pfn() Maybe introduce the kmap_local_phys() he suggested too. > /* Helper function to handle DMA data transfers. */ > -void kmsan_handle_dma(struct page *page, size_t offset, size_t size, > +void kmsan_handle_dma(phys_addr_t phys, size_t size, > enum dma_data_direction dir) > { > u64 page_offset, to_go, addr; > + struct page *page; > + void *kaddr; > > - if (PageHighMem(page)) > + if (!pfn_valid(PHYS_PFN(phys))) > return; Not needed, the caller must pass in a phys that is kmap compatible. Maybe just leave a comment. FWIW today this is also not checking for P2P or DEVICE non-kmap struct pages either, so it should be fine without checks. > - addr = (u64)page_address(page) + offset; > + > + page = phys_to_page(phys); > + page_offset = offset_in_page(phys); > + > /* > * The kernel may occasionally give us adjacent DMA pages not belonging > * to the same allocation. Process them separately to avoid triggering > * internal KMSAN checks. > */ > while (size > 0) { > - page_offset = offset_in_page(addr); > to_go = min(PAGE_SIZE - page_offset, (u64)size); > + > + if (PageHighMem(page)) > + /* Handle highmem pages using kmap */ > + kaddr = kmap_local_page(page); No need for the PageHighMem() - just always call kmap_local_pfn(). I'd also propose that any debug/sanitizer checks that the passed phys is valid for kmap (eg pfn valid, not zone_device, etc) should be inside the kmap code. Jason