Currently, mte_set_mem_tag_range() and mte_zero_clear_page_tags() use
DC {GVA,GZVA} unconditionally. But, they should make sure that
DCZID_EL0.DZP, which indicates whether or not use of those instructions
is prohibited, is zero when using those instructions.
Use ST{G,ZG,Z2G} instead when DCZID_EL0.DZP == 1.
Fixes: 013bb59dbb ("arm64: mte: handle tags zeroing at page allocation time")
Fixes: 3d0cca0b02 ("kasan: speed up mte_set_mem_tag_range")
Signed-off-by: Reiji Watanabe <reijiw@google.com>
Link: https://lore.kernel.org/r/20211206004736.1520989-3-reijiw@google.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
(cherry picked from commit 685e2564da)
Bug: 187129171
Signed-off-by: Connor O'Brien <connoro@google.com>
Change-Id: I1e7615a060d86aa743426334ec79d69b4299c7e8
7a1e7dc41e