helper functions to handler shadow pkey register
Signed-off-by: Ram Pai linuxram@us.ibm.com --- tools/testing/selftests/vm/pkey-helpers.h | 27 ++++++++++++++++++++ tools/testing/selftests/vm/protection_keys.c | 34 ++++++++++++++++--------- 2 files changed, 49 insertions(+), 12 deletions(-)
diff --git a/tools/testing/selftests/vm/pkey-helpers.h b/tools/testing/selftests/vm/pkey-helpers.h index b6c2133..7c979ad 100644 --- a/tools/testing/selftests/vm/pkey-helpers.h +++ b/tools/testing/selftests/vm/pkey-helpers.h @@ -44,6 +44,33 @@ #define DEBUG_LEVEL 0 #endif #define DPRINT_IN_SIGNAL_BUF_SIZE 4096 + +static inline u32 pkey_to_shift(int pkey) +{ + return pkey * PKEY_BITS_PER_PKEY; +} + +static inline pkey_reg_t reset_bits(int pkey, pkey_reg_t bits) +{ + u32 shift = pkey_to_shift(pkey); + + return ~(bits << shift); +} + +static inline pkey_reg_t left_shift_bits(int pkey, pkey_reg_t bits) +{ + u32 shift = pkey_to_shift(pkey); + + return (bits << shift); +} + +static inline pkey_reg_t right_shift_bits(int pkey, pkey_reg_t bits) +{ + u32 shift = pkey_to_shift(pkey); + + return (bits >> shift); +} + extern int dprint_in_signal; extern char dprint_in_signal_buffer[DPRINT_IN_SIGNAL_BUF_SIZE]; static inline void sigsafe_printf(const char *format, ...) diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c index 3ef2569..83216c5 100644 --- a/tools/testing/selftests/vm/protection_keys.c +++ b/tools/testing/selftests/vm/protection_keys.c @@ -374,7 +374,7 @@ u32 pkey_get(int pkey, unsigned long flags) __func__, pkey, flags, 0, 0); dprintf2("%s() raw pkey_reg: %x\n", __func__, pkey_reg);
- shifted_pkey_reg = (pkey_reg >> (pkey * PKEY_BITS_PER_PKEY)); + shifted_pkey_reg = right_shift_bits(pkey, pkey_reg); dprintf2("%s() shifted_pkey_reg: %x\n", __func__, shifted_pkey_reg); masked_pkey_reg = shifted_pkey_reg & mask; dprintf2("%s() masked pkey_reg: %x\n", __func__, masked_pkey_reg); @@ -397,9 +397,9 @@ int pkey_set(int pkey, unsigned long rights, unsigned long flags) /* copy old pkey_reg */ new_pkey_reg = old_pkey_reg; /* mask out bits from pkey in old value: */ - new_pkey_reg &= ~(mask << (pkey * PKEY_BITS_PER_PKEY)); + new_pkey_reg &= reset_bits(pkey, mask); /* OR in new bits for pkey: */ - new_pkey_reg |= (rights << (pkey * PKEY_BITS_PER_PKEY)); + new_pkey_reg |= left_shift_bits(pkey, rights);
__wrpkey_reg(new_pkey_reg);
@@ -430,7 +430,7 @@ void pkey_disable_set(int pkey, int flags) ret = pkey_set(pkey, pkey_rights, syscall_flags); assert(!ret); /*pkey_reg and flags have the same format */ - shadow_pkey_reg |= flags << (pkey * 2); + shadow_pkey_reg |= left_shift_bits(pkey, flags); dprintf1("%s(%d) shadow: 0x%016lx\n", __func__, pkey, shadow_pkey_reg);
@@ -465,7 +465,7 @@ void pkey_disable_clear(int pkey, int flags)
ret = pkey_set(pkey, pkey_rights, 0); /* pkey_reg and flags have the same format */ - shadow_pkey_reg &= ~(flags << (pkey * 2)); + shadow_pkey_reg &= reset_bits(pkey, flags); pkey_assert(ret >= 0);
pkey_rights = pkey_get(pkey, syscall_flags); @@ -523,6 +523,21 @@ int sys_pkey_alloc(unsigned long flags, unsigned long init_val) return ret; }
+void pkey_setup_shadow(void) +{ + shadow_pkey_reg = __rdpkey_reg(); +} + +void pkey_reset_shadow(u32 key) +{ + shadow_pkey_reg &= reset_bits(key, 0x3); +} + +void pkey_set_shadow(u32 key, u64 init_val) +{ + shadow_pkey_reg |= left_shift_bits(key, init_val); +} + int alloc_pkey(void) { int ret; @@ -540,7 +555,7 @@ int alloc_pkey(void) shadow_pkey_reg); if (ret) { /* clear both the bits: */ - shadow_pkey_reg &= ~(0x3 << (ret * 2)); + pkey_reset_shadow(ret); dprintf4("%s()::%d, ret: %d pkey_reg: 0x%016lx " "shadow: 0x%016lx\n", __func__, @@ -550,7 +565,7 @@ int alloc_pkey(void) * move the new state in from init_val * (remember, we cheated and init_val == pkey_reg format) */ - shadow_pkey_reg |= (init_val << (ret * 2)); + pkey_set_shadow(ret, init_val); } dprintf4("%s()::%d, ret: %d pkey_reg: 0x%016lx shadow: 0x%016lx\n", __func__, __LINE__, ret, __rdpkey_reg(), @@ -1322,11 +1337,6 @@ void run_tests_once(void) iteration_nr++; }
-void pkey_setup_shadow(void) -{ - shadow_pkey_reg = __rdpkey_reg(); -} - int main(void) { int nr_iterations = 22;