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| author | Sandipan Das <sandipan@linux.ibm.com> | 2020-06-04 16:51:54 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-04 19:06:26 -0700 |
| commit | 0c416bcaef8dc9b8378b3e7fa7ce3e9ad5cedcd0 (patch) | |
| tree | 781f21a7043beb71bab8cea14f6454559e0f4814 /tools/testing/selftests/vm/pkey-helpers.h | |
| parent | 4dbdd947cb7f5534bedfdd1dbf983d0c0d9def29 (diff) | |
| download | linux-0c416bcaef8dc9b8378b3e7fa7ce3e9ad5cedcd0.tar.bz2 | |
selftests: vm: pkeys: add helpers for pkey bits
This introduces some functions that help with setting or clearing bits of
a particular pkey. This also adds an abstraction for getting a pkey's bit
position in the pkey register as this may vary across architectures.
Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Dave Hansen <dave.hansen@intel.com>
Cc: "Desnes A. Nunes do Rosario" <desnesn@linux.vnet.ibm.com>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Ram Pai <linuxram@us.ibm.com>
Cc: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Michal Suchanek <msuchanek@suse.de>
Cc: Shuah Khan <shuah@kernel.org>
Link: http://lkml.kernel.org/r/2ad9705f4f68ca7e72155cc583415e5a979546f1.1585646528.git.sandipan@linux.ibm.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'tools/testing/selftests/vm/pkey-helpers.h')
| -rw-r--r-- | tools/testing/selftests/vm/pkey-helpers.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/tools/testing/selftests/vm/pkey-helpers.h b/tools/testing/selftests/vm/pkey-helpers.h index dfbce49269ce..0e3da7c8d628 100644 --- a/tools/testing/selftests/vm/pkey-helpers.h +++ b/tools/testing/selftests/vm/pkey-helpers.h @@ -80,6 +80,28 @@ extern void abort_hooks(void); #error Architecture not supported #endif /* arch */ +#define PKEY_MASK (PKEY_DISABLE_ACCESS | PKEY_DISABLE_WRITE) + +static inline u64 set_pkey_bits(u64 reg, int pkey, u64 flags) +{ + u32 shift = pkey_bit_position(pkey); + /* mask out bits from pkey in old value */ + reg &= ~((u64)PKEY_MASK << shift); + /* OR in new bits for pkey */ + reg |= (flags & PKEY_MASK) << shift; + return reg; +} + +static inline u64 get_pkey_bits(u64 reg, int pkey) +{ + u32 shift = pkey_bit_position(pkey); + /* + * shift down the relevant bits to the lowest two, then + * mask off all the other higher bits + */ + return ((reg >> shift) & PKEY_MASK); +} + extern u64 shadow_pkey_reg; static inline u64 _read_pkey_reg(int line) |