[PATCH v2 1/4] KVM: arm64: Clear the whole hugetlb folio when sanitising MTE tags

[Catalin Marinas]

On Wed, Oct 21, 2026 at 12:06:57PM +0100, Fuad Tabba wrote:
> sanitise_mte_tags() clears the tags of the pages about to be mapped at
> stage-2 before marking them tagged. For a hugetlb folio the flag covers
> every page in the folio, but the loop only covers the mapping being
> installed. Stage-2 maps a folio in pieces for the contiguous hugetlb
> sizes, and for any size under dirty logging. The first fault then marks
> the whole folio after clearing only its own piece, and the rest keeps
> its previous owner's tags for the guest to read.
> 
> Clear the whole folio, as mte_sync_tags() does.
> 
> Fixes: 25c17c4b55def ("hugetlb: arm64: add mte support")
> Reviewed-by: Lorenzo Stoakes (ARM) <ljs at kernel.org>
> Cc: stable at vger.kernel.org
> Signed-off-by: Fuad Tabba <fuad.tabba at linux.dev>

Reviewed-by: Catalin Marinas <catalin.marinas at arm.com>