diff options
Diffstat (limited to 'mm/kmsan/shadow.c')
| -rw-r--r-- | mm/kmsan/shadow.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/mm/kmsan/shadow.c b/mm/kmsan/shadow.c index 8c81a059beea..6e90a806a704 100644 --- a/mm/kmsan/shadow.c +++ b/mm/kmsan/shadow.c @@ -258,3 +258,37 @@ ret: kfree(s_pages); kfree(o_pages); } + +/* Allocate metadata for pages allocated at boot time. */ +void __init kmsan_init_alloc_meta_for_range(void *start, void *end) +{ + struct page *shadow_p, *origin_p; + void *shadow, *origin; + struct page *page; + u64 size; + + start = (void *)ALIGN_DOWN((u64)start, PAGE_SIZE); + size = ALIGN((u64)end - (u64)start, PAGE_SIZE); + shadow = memblock_alloc(size, PAGE_SIZE); + origin = memblock_alloc(size, PAGE_SIZE); + for (u64 addr = 0; addr < size; addr += PAGE_SIZE) { + page = virt_to_page_or_null((char *)start + addr); + shadow_p = virt_to_page_or_null((char *)shadow + addr); + set_no_shadow_origin_page(shadow_p); + shadow_page_for(page) = shadow_p; + origin_p = virt_to_page_or_null((char *)origin + addr); + set_no_shadow_origin_page(origin_p); + origin_page_for(page) = origin_p; + } +} + +void kmsan_setup_meta(struct page *page, struct page *shadow, + struct page *origin, int order) +{ + for (int i = 0; i < (1 << order); i++) { + set_no_shadow_origin_page(&shadow[i]); + set_no_shadow_origin_page(&origin[i]); + shadow_page_for(&page[i]) = &shadow[i]; + origin_page_for(&page[i]) = &origin[i]; + } +} |