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kasan, arm64: add arch_suppress_tag_checks_start/stop 

Add two new tagging-related routines arch_suppress_tag_checks_start/stop
that suppress MTE tag checking via the TCO register.

These rouines are used in the next patch.

[andreyknvl@google.com: drop __ from mte_disable/enable_tco names]
  Link: https://lkml.kernel.org/r/7ad5e5a9db79e3aba08d8f43aca24350b04080f6.1680114854.git.andreyknvl@google.com
Link: https://lkml.kernel.org/r/75a362551c3c54b70ae59a3492cabb51c105fa6b.1678491668.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Marco Elver <elver@google.com>
Cc: Peter Collingbourne <pcc@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Weizhao Ouyang <ouyangweizhao@zeku.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Andrey Konovalov 2023-03-11 00:43:32 +01:00 committed by Andrew Morton
parent 2cc029a084
commit 0d3c9468be
2 changed files with 4 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm64/include/asm/memory.h
View File

@ -264,6 +264,8 @@ static inline const void *__tag_set(const void *addr, u8 tag)
#define arch_enable_tag_checks_sync() mte_enable_kernel_sync()
#define arch_enable_tag_checks_async() mte_enable_kernel_async()
#define arch_enable_tag_checks_asymm() mte_enable_kernel_asymm()
#define arch_suppress_tag_checks_start() mte_enable_tco()
#define arch_suppress_tag_checks_stop() mte_disable_tco()
#define arch_force_async_tag_fault() mte_check_tfsr_exit()
#define arch_get_random_tag() mte_get_random_tag()
#define arch_get_mem_tag(addr) mte_get_mem_tag(addr)

2
mm/kasan/kasan.h
View File

@ -398,6 +398,8 @@ static inline const void *arch_kasan_set_tag(const void *addr, u8 tag)
#define hw_enable_tag_checks_sync() arch_enable_tag_checks_sync()
#define hw_enable_tag_checks_async() arch_enable_tag_checks_async()
#define hw_enable_tag_checks_asymm() arch_enable_tag_checks_asymm()
#define hw_suppress_tag_checks_start() arch_suppress_tag_checks_start()
#define hw_suppress_tag_checks_stop() arch_suppress_tag_checks_stop()
#define hw_force_async_tag_fault() arch_force_async_tag_fault()
#define hw_get_random_tag() arch_get_random_tag()
#define hw_get_mem_tag(addr) arch_get_mem_tag(addr)