On Wed, Jun 25, 2025 at 3:19 PM Leon Romanovsky <leon@xxxxxxxxxx> wrote: > > From: Leon Romanovsky <leonro@xxxxxxxxxx> Hi Leon, > > 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). Could you please elaborate a bit why this is needed? Are you fixing some particular issue? > 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. KMSAN only works on 64-bit systems, do we actually have highmem on any of these?
