From: Sandipan Das <sandipan@linux.ibm.com>
To: shuah@kernel.org, linux-kselftest@vger.kernel.org
Cc: linux-arch@vger.kernel.org, fweimer@redhat.com,
dave.hansen@intel.com, x86@kernel.org, linuxram@us.ibm.com,
mhocko@kernel.org, linux-mm@kvack.org, mingo@redhat.com,
aneesh.kumar@linux.ibm.com, bauerman@linux.ibm.com,
msuchanek@suse.de, mpe@ellerman.id.au,
linuxppc-dev@lists.ozlabs.org
Subject: [PATCH v16 07/23] selftests: vm: pkeys: Add helpers for pkey bits
Date: Fri, 17 Jan 2020 18:19:46 +0530 [thread overview]
Message-ID: <899542624ac1245640966a537599bf9b86077c47.1579265066.git.sandipan@linux.ibm.com> (raw)
In-Reply-To: <cover.1579265066.git.sandipan@linux.ibm.com>
In-Reply-To: <cover.1579265066.git.sandipan@linux.ibm.com>
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.
cc: Dave Hansen <dave.hansen@intel.com>
cc: Florian Weimer <fweimer@redhat.com>
cc: Ram Pai <linuxram@us.ibm.com>
cc: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
---
tools/testing/selftests/vm/pkey-helpers.h | 22 ++++++++++++++
tools/testing/selftests/vm/pkey-x86.h | 5 +++
tools/testing/selftests/vm/protection_keys.c | 32 ++++++--------------
3 files changed, 36 insertions(+), 23 deletions(-)
diff --git a/tools/testing/selftests/vm/pkey-helpers.h b/tools/testing/selftests/vm/pkey-helpers.h
index cc3491a6df2d..df4b46050393 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)
diff --git a/tools/testing/selftests/vm/pkey-x86.h b/tools/testing/selftests/vm/pkey-x86.h
index dc34ae21e714..f05e45ecaffb 100644
--- a/tools/testing/selftests/vm/pkey-x86.h
+++ b/tools/testing/selftests/vm/pkey-x86.h
@@ -118,6 +118,11 @@ static inline int cpu_has_pku(void)
return 1;
}
+static inline u32 pkey_bit_position(int pkey)
+{
+ return pkey * PKEY_BITS_PER_PKEY;
+}
+
#define XSTATE_PKEY_BIT (9)
#define XSTATE_PKEY 0x200
diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c
index f36e9e7789ce..3ce5a87804ab 100644
--- a/tools/testing/selftests/vm/protection_keys.c
+++ b/tools/testing/selftests/vm/protection_keys.c
@@ -333,25 +333,13 @@ pid_t fork_lazy_child(void)
static u32 hw_pkey_get(int pkey, unsigned long flags)
{
- u32 mask = (PKEY_DISABLE_ACCESS|PKEY_DISABLE_WRITE);
u64 pkey_reg = __read_pkey_reg();
- u64 shifted_pkey_reg;
- u32 masked_pkey_reg;
dprintf1("%s(pkey=%d, flags=%lx) = %x / %d\n",
__func__, pkey, flags, 0, 0);
dprintf2("%s() raw pkey_reg: %016lx\n", __func__, pkey_reg);
- shifted_pkey_reg = (pkey_reg >> (pkey * PKEY_BITS_PER_PKEY));
- dprintf2("%s() shifted_pkey_reg: %016lx\n", __func__,
- shifted_pkey_reg);
- masked_pkey_reg = shifted_pkey_reg & mask;
- dprintf2("%s() masked pkey_reg: %x\n", __func__, masked_pkey_reg);
- /*
- * shift down the relevant bits to the lowest two, then
- * mask off all the other high bits.
- */
- return masked_pkey_reg;
+ return (u32) get_pkey_bits(pkey_reg, pkey);
}
static int hw_pkey_set(int pkey, unsigned long rights, unsigned long flags)
@@ -363,12 +351,8 @@ static int hw_pkey_set(int pkey, unsigned long rights, unsigned long flags)
/* make sure that 'rights' only contains the bits we expect: */
assert(!(rights & ~mask));
- /* 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));
- /* OR in new bits for pkey: */
- new_pkey_reg |= (rights << (pkey * PKEY_BITS_PER_PKEY));
+ /* modify bits accordingly in old pkey_reg and assign it */
+ new_pkey_reg = set_pkey_bits(old_pkey_reg, pkey, rights);
__write_pkey_reg(new_pkey_reg);
@@ -402,7 +386,7 @@ void pkey_disable_set(int pkey, int flags)
ret = hw_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 = set_pkey_bits(shadow_pkey_reg, pkey, pkey_rights);
dprintf1("%s(%d) shadow: 0x%016lx\n",
__func__, pkey, shadow_pkey_reg);
@@ -436,7 +420,7 @@ void pkey_disable_clear(int pkey, int flags)
pkey_rights |= flags;
ret = hw_pkey_set(pkey, pkey_rights, 0);
- shadow_pkey_reg &= ~(flags << (pkey * 2));
+ shadow_pkey_reg = set_pkey_bits(shadow_pkey_reg, pkey, pkey_rights);
pkey_assert(ret >= 0);
pkey_rights = hw_pkey_get(pkey, syscall_flags);
@@ -512,7 +496,8 @@ int alloc_pkey(void)
shadow_pkey_reg);
if (ret) {
/* clear both the bits: */
- shadow_pkey_reg &= ~(0x3 << (ret * 2));
+ shadow_pkey_reg = set_pkey_bits(shadow_pkey_reg, ret,
+ ~PKEY_MASK);
dprintf4("%s()::%d, ret: %d pkey_reg: 0x%016lx"
" shadow: 0x%016lx\n",
__func__,
@@ -522,7 +507,8 @@ 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));
+ shadow_pkey_reg = set_pkey_bits(shadow_pkey_reg, ret,
+ init_val);
}
dprintf4("%s()::%d, ret: %d pkey_reg: 0x%016lx"
" shadow: 0x%016lx\n",
--
2.17.1
next prev parent reply other threads:[~2020-01-17 12:50 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-17 12:49 [PATCH v16 00/23] selftests, powerpc, x86: Memory Protection Keys Sandipan Das
2020-01-17 12:49 ` [PATCH v16 01/23] selftests/x86/pkeys: Move selftests to arch-neutral directory Sandipan Das
2020-01-17 12:49 ` [PATCH v16 02/23] selftests/vm: Rename all references to pkru to a generic name Sandipan Das
2020-01-17 12:49 ` [PATCH v16 03/23] selftests/vm: Move generic definitions to header file Sandipan Das
2020-01-17 12:49 ` [PATCH v16 04/23] selftests/vm: Move some definitions to arch-specific header Sandipan Das
2020-01-17 12:49 ` [PATCH v16 05/23] selftests/vm: Make gcc check arguments of sigsafe_printf() Sandipan Das
2020-01-17 12:49 ` [PATCH v16 06/23] selftests/vm: Typecast references to pkey register Sandipan Das
2020-01-17 12:49 ` Sandipan Das [this message]
2020-01-17 12:49 ` [PATCH v16 08/23] selftests/vm: Fix pkey_disable_clear() Sandipan Das
2020-01-17 12:49 ` [PATCH v16 09/23] selftests/vm/pkeys: Fix assertion in pkey_disable_set/clear() Sandipan Das
2020-01-17 12:49 ` [PATCH v16 10/23] selftests/vm/pkeys: Fix alloc_random_pkey() to make it really random Sandipan Das
2020-01-17 12:49 ` [PATCH v16 11/23] selftests: vm: pkeys: Use the correct huge page size Sandipan Das
2020-01-17 12:49 ` [PATCH v16 12/23] selftests/vm/pkeys: Introduce generic pkey abstractions Sandipan Das
2020-01-17 12:49 ` [PATCH v16 13/23] selftests/vm/pkeys: Introduce powerpc support Sandipan Das
2020-01-17 12:49 ` [PATCH v16 14/23] selftests/vm/pkeys: Fix number of reserved powerpc pkeys Sandipan Das
2020-01-17 12:49 ` [PATCH v16 15/23] selftests/vm/pkeys: Fix assertion in test_pkey_alloc_exhaust() Sandipan Das
2020-01-17 12:49 ` [PATCH v16 16/23] selftests/vm/pkeys: Improve checks to determine pkey support Sandipan Das
2020-01-17 12:49 ` [PATCH v16 17/23] selftests/vm/pkeys: Associate key on a mapped page and detect access violation Sandipan Das
2020-01-17 12:49 ` [PATCH v16 18/23] selftests/vm/pkeys: Associate key on a mapped page and detect write violation Sandipan Das
2020-01-17 12:49 ` [PATCH v16 19/23] selftests/vm/pkeys: Detect write violation on a mapped access-denied-key page Sandipan Das
2020-01-17 12:49 ` [PATCH v16 20/23] selftests/vm/pkeys: Introduce a sub-page allocator Sandipan Das
2020-01-17 12:50 ` [PATCH v16 21/23] selftests/vm/pkeys: Test correct behaviour of pkey-0 Sandipan Das
2020-01-17 12:50 ` [PATCH v16 22/23] selftests/vm/pkeys: Override access right definitions on powerpc Sandipan Das
2020-01-17 12:50 ` [PATCH v16 23/23] selftests: vm: pkeys: Use the correct page size " Sandipan Das
2020-01-17 18:02 ` [PATCH v16 00/23] selftests, powerpc, x86: Memory Protection Keys Dave Hansen
2020-01-18 9:24 ` Sandipan Das
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