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| author |   Reiji Watanabe <reijiw@google.com> | 2021-12-05 16:47:36 -0800 |
|---|---|---|
| committer |   Catalin Marinas <catalin.marinas@arm.com> | 2021-12-06 17:02:10 +0000 |
| commit | 685e2564daa1493053fcd7f1dbed38b35ee2f3cb (patch) | |
| tree | f7409f8ee9f4ac811079d1f671cce80cf530d0e8 /Documentation/arm64 | |
| parent | arm64: clear_page() shouldn't use DC ZVA when DCZID_EL0.DZP == 1 (diff) | |
| download | linux-dev-685e2564daa1493053fcd7f1dbed38b35ee2f3cb.tar.xz linux-dev-685e2564daa1493053fcd7f1dbed38b35ee2f3cb.zip | |
arm64: mte: DC {GVA,GZVA} shouldn't be used when DCZID_EL0.DZP == 1
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: 013bb59dbb7c ("arm64: mte: handle tags zeroing at page allocation time")
Fixes: 3d0cca0b02ac ("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>
Diffstat (limited to 'Documentation/arm64')
0 files changed, 0 insertions, 0 deletions