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hugetlb: arm64: add mte support

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Enable MTE support for hugetlb.

The MTE page flags will be set on the folio only.  When copying
hugetlb folio (for example, CoW), the tags for all subpages will be copied
when copying the first subpage.

When freeing hugetlb folio, the MTE flags will be cleared.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Yang Shi <yang@os.amperecomputing.com>
Link: https://lore.kernel.org/r/20241001225220.271178-1-yang@os.amperecomputing.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Yang Shi
2024-10-01 15:52:19 -07:00
committed by Catalin Marinas
parent 9852d85ec9
commit 25c17c4b55
9 changed files with 159 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
arch/arm64/kernel/hibernate.c
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@@ -266,9 +266,15 @@ static int swsusp_mte_save_tags(void)
max_zone_pfn = zone_end_pfn(zone);
for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) {
struct page *page = pfn_to_online_page(pfn);
struct folio *folio;
if (!page)
continue;
folio = page_folio(page);
if (folio_test_hugetlb(folio) &&
!folio_test_hugetlb_mte_tagged(folio))
continue;
if (!page_mte_tagged(page))
continue;