linux-stable.git/tools/testing/selftests/rseq, branch v4.18

rseq/selftests: cleanup: Update comment above rseq_prepare_unload

2018-07-10T20:18:52+00:00

rseq as it was merged does not have rseq_finish_*() in the user-space
selftests anymore. Update the rseq_prepare_unload() helper comment to
adapt to this reality.

Signed-off-by: Mathieu Desnoyers 
Signed-off-by: Thomas Gleixner 
Cc: linux-api@vger.kernel.org
Cc: Peter Zijlstra 
Cc: "Paul E . McKenney" 
Cc: Boqun Feng 
Cc: Andy Lutomirski 
Cc: Dave Watson 
Cc: Paul Turner 
Cc: Andrew Morton 
Cc: Russell King 
Cc: "H . Peter Anvin" 
Cc: Andi Kleen 
Cc: Chris Lameter 
Cc: Ben Maurer 
Cc: Steven Rostedt 
Cc: Josh Triplett 
Cc: Linus Torvalds 
Cc: Catalin Marinas 
Cc: Will Deacon 
Cc: Michael Kerrisk 
Cc: Joel Fernandes 
Cc: "Paul E. McKenney" 
Cc: "H. Peter Anvin" 
Link: https://lkml.kernel.org/r/20180709195155.7654-7-mathieu.desnoyers@efficios.com

rseq: uapi: Declare rseq_cs field as union, update includes

2018-07-10T20:18:52+00:00

Declaring the rseq_cs field as a union between __u64 and two __u32
allows both 32-bit and 64-bit kernels to read the full __u64, and
therefore validate that a 32-bit user-space cleared the upper 32
bits, thus ensuring a consistent behavior between native 32-bit
kernels and 32-bit compat tasks on 64-bit kernels.

Check that the rseq_cs value read is < TASK_SIZE.

The asm/byteorder.h header needs to be included by rseq.h, now
that it is not using linux/types_32_64.h anymore.

Considering that only __32 and __u64 types are declared in linux/rseq.h,
the linux/types.h header should always be included for both kernel and
user-space code: including stdint.h is just for u64 and u32, which are
not used in this header at all.

Use copy_from_user()/clear_user() to interact with a 64-bit field,
because arm32 does not implement 64-bit __get_user, and ppc32 does not
64-bit get_user. Considering that the rseq_cs pointer does not need to
be loaded/stored with single-copy atomicity from the kernel anymore, we
can simply use copy_from_user()/clear_user().

Signed-off-by: Mathieu Desnoyers 
Signed-off-by: Thomas Gleixner 
Cc: linux-api@vger.kernel.org
Cc: Peter Zijlstra 
Cc: "Paul E . McKenney" 
Cc: Boqun Feng 
Cc: Andy Lutomirski 
Cc: Dave Watson 
Cc: Paul Turner 
Cc: Andrew Morton 
Cc: Russell King 
Cc: "H . Peter Anvin" 
Cc: Andi Kleen 
Cc: Chris Lameter 
Cc: Ben Maurer 
Cc: Steven Rostedt 
Cc: Josh Triplett 
Cc: Linus Torvalds 
Cc: Catalin Marinas 
Cc: Will Deacon 
Cc: Michael Kerrisk 
Cc: Joel Fernandes 
Cc: "Paul E. McKenney" 
Cc: "H. Peter Anvin" 
Link: https://lkml.kernel.org/r/20180709195155.7654-5-mathieu.desnoyers@efficios.com

Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2018-06-24T12:18:19+00:00

Pull rseq fixes from Thomas Gleixer:
 "A pile of rseq related fixups:

   - Prevent infinite recursion when delivering SIGSEGV

   - Remove the abort of rseq critical section on fork() as syscalls
     inside rseq critical sections are explicitely forbidden. So no
     point in doing the abort on the child.

   - Align the rseq structure on 32 bytes in the ARM selftest code.

   - Fix file permissions of the test script"

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  rseq: Avoid infinite recursion when delivering SIGSEGV
  rseq/cleanup: Do not abort rseq c.s. in child on fork()
  rseq/selftests/arm: Align 'struct rseq_cs' on 32 bytes
  rseq/selftests: Make run_param_test.sh executable

rseq/selftests/arm: Align 'struct rseq_cs' on 32 bytes

2018-06-21T10:40:13+00:00

uapi/linux/rseq.h aligns 'struct rseq_cs' on 32 bytes. Satisfy this
alignment requirement in its definition within the rseq-arm.h
inline assembly as well.

Signed-off-by: Mathieu Desnoyers 
Cc: Andrew Hunter 
Cc: Andrew Morton 
Cc: Andy Lutomirski 
Cc: Ben Maurer 
Cc: Boqun Feng 
Cc: Catalin Marinas 
Cc: Chris Lameter 
Cc: Dave Watson 
Cc: Joel Fernandes 
Cc: Josh Triplett 
Cc: Linus Torvalds 
Cc: Michael Kerrisk 
Cc: Paul E . McKenney 
Cc: Paul Turner 
Cc: Peter Zijlstra 
Cc: Russell King 
Cc: Shuah Khan 
Cc: Steven Rostedt 
Cc: Thomas Gleixner 
Cc: Will Deacon 
Cc: linux-api@vger.kernel.org
Cc: linux-kselftest@vger.kernel.org
Link: https://lore.kernel.org/lkml/20180619133230.4087-3-mathieu.desnoyers@efficios.com
Signed-off-by: Ingo Molnar

rseq/selftests: Make run_param_test.sh executable

2018-06-21T10:39:56+00:00

The executable bit of the run_param_test.sh script got lost in
the merge.

Signed-off-by: Mathieu Desnoyers 
Cc: Andrew Hunter 
Cc: Andrew Morton 
Cc: Andy Lutomirski 
Cc: Ben Maurer 
Cc: Boqun Feng 
Cc: Catalin Marinas 
Cc: Chris Lameter 
Cc: Dave Watson 
Cc: Joel Fernandes 
Cc: Josh Triplett 
Cc: Linus Torvalds 
Cc: Michael Kerrisk 
Cc: Paul E . McKenney 
Cc: Paul Turner 
Cc: Peter Zijlstra 
Cc: Russell King 
Cc: Shuah Khan 
Cc: Steven Rostedt 
Cc: Thomas Gleixner 
Cc: Will Deacon 
Cc: linux-api@vger.kernel.org
Cc: linux-kselftest@vger.kernel.org
Link: https://lore.kernel.org/lkml/20180619133230.4087-2-mathieu.desnoyers@efficios.com
Signed-off-by: Ingo Molnar

rseq/selftests: Implement MIPS support

2018-06-20T04:14:19+00:00

Implement support for both MIPS32 & MIPS64 in the rseq selftests, in
order to sanity check the recently enabled rseq syscall.

The tests all pass on a MIPS Boston development board running either a
MIPS32r2 interAptiv CPU & a MIPS64r6 I6500 CPU, both of which were
configured with 2 cores each of which have 2 hardware threads (VP(E)s) -
ie. 4 CPUs.

Signed-off-by: Paul Burton 
Reviewed-by: James Hogan 
Patchwork: https://patchwork.linux-mips.org/patch/19524/
Cc: Ralf Baechle 
Cc: Mathieu Desnoyers 
Cc: Peter Zijlstra 
Cc: Paul E. McKenney 
Cc: Boqun Feng 
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org

rseq/selftests: Provide Makefile, scripts, gitignore

2018-06-06T09:58:35+00:00

A run_param_test.sh script runs many variants of the parametrizable
tests.

Wire up the rseq Makefile, add directory entry into MAINTAINERS file.

Signed-off-by: Mathieu Desnoyers 
Signed-off-by: Thomas Gleixner 
Cc: Joel Fernandes 
Cc: Peter Zijlstra 
Cc: Catalin Marinas 
Cc: Dave Watson 
Cc: Will Deacon 
Cc: Shuah Khan 
Cc: Andi Kleen 
Cc: linux-kselftest@vger.kernel.org
Cc: "H . Peter Anvin" 
Cc: Chris Lameter 
Cc: Russell King 
Cc: Andrew Hunter 
Cc: Michael Kerrisk 
Cc: "Paul E . McKenney" 
Cc: Paul Turner 
Cc: Boqun Feng 
Cc: Josh Triplett 
Cc: Steven Rostedt 
Cc: Ben Maurer 
Cc: linux-api@vger.kernel.org
Cc: Andy Lutomirski 
Cc: Andrew Morton 
Cc: Linus Torvalds 
Link: https://lkml.kernel.org/r/20180602124408.8430-17-mathieu.desnoyers@efficios.com

rseq/selftests: Provide parametrized tests

2018-06-06T09:58:35+00:00

"param_test" is a parametrizable restartable sequences test. See
the "--help" output for usage.

"param_test_benchmark" is the same as "param_test", but it removes
testing book-keeping code to allow accurate benchmarks.

"param_test_compare_twice" is the same as "param_test", but it performs
each comparison within rseq critical section twice, thus validating
invariants. If any of the second comparisons fails, an error message
is printed and the test aborts.

Signed-off-by: Mathieu Desnoyers 
Signed-off-by: Thomas Gleixner 
Cc: Joel Fernandes 
Cc: Peter Zijlstra 
Cc: Catalin Marinas 
Cc: Dave Watson 
Cc: Will Deacon 
Cc: Shuah Khan 
Cc: Andi Kleen 
Cc: linux-kselftest@vger.kernel.org
Cc: "H . Peter Anvin" 
Cc: Chris Lameter 
Cc: Russell King 
Cc: Andrew Hunter 
Cc: Michael Kerrisk 
Cc: "Paul E . McKenney" 
Cc: Paul Turner 
Cc: Boqun Feng 
Cc: Josh Triplett 
Cc: Steven Rostedt 
Cc: Ben Maurer 
Cc: linux-api@vger.kernel.org
Cc: Andy Lutomirski 
Cc: Andrew Morton 
Cc: Linus Torvalds 
Link: https://lkml.kernel.org/r/20180602124408.8430-16-mathieu.desnoyers@efficios.com

rseq/selftests: Provide basic percpu ops test

2018-06-06T09:58:35+00:00

"basic_percpu_ops_test" is a slightly more "realistic" variant,
implementing a few simple per-cpu operations and testing their
correctness.

Signed-off-by: Mathieu Desnoyers 
Signed-off-by: Thomas Gleixner 
Cc: Joel Fernandes 
Cc: Peter Zijlstra 
Cc: Catalin Marinas 
Cc: Dave Watson 
Cc: Will Deacon 
Cc: Shuah Khan 
Cc: Andi Kleen 
Cc: linux-kselftest@vger.kernel.org
Cc: "H . Peter Anvin" 
Cc: Chris Lameter 
Cc: Russell King 
Cc: Andrew Hunter 
Cc: Michael Kerrisk 
Cc: "Paul E . McKenney" 
Cc: Paul Turner 
Cc: Boqun Feng 
Cc: Josh Triplett 
Cc: Steven Rostedt 
Cc: Ben Maurer 
Cc: linux-api@vger.kernel.org
Cc: Andy Lutomirski 
Cc: Andrew Morton 
Cc: Linus Torvalds 
Link: https://lkml.kernel.org/r/20180602124408.8430-15-mathieu.desnoyers@efficios.com

rseq/selftests: Provide basic test

2018-06-06T09:58:35+00:00

"basic_test" only asserts that RSEQ works moderately correctly. E.g.
that the CPUID pointer works.

Signed-off-by: Mathieu Desnoyers 
Signed-off-by: Thomas Gleixner 
Cc: Joel Fernandes 
Cc: Peter Zijlstra 
Cc: Catalin Marinas 
Cc: Dave Watson 
Cc: Will Deacon 
Cc: Shuah Khan 
Cc: Andi Kleen 
Cc: linux-kselftest@vger.kernel.org
Cc: "H . Peter Anvin" 
Cc: Chris Lameter 
Cc: Russell King 
Cc: Andrew Hunter 
Cc: Michael Kerrisk 
Cc: "Paul E . McKenney" 
Cc: Paul Turner 
Cc: Boqun Feng 
Cc: Josh Triplett 
Cc: Steven Rostedt 
Cc: Ben Maurer 
Cc: linux-api@vger.kernel.org
Cc: Andy Lutomirski 
Cc: Andrew Morton 
Cc: Linus Torvalds 
Link: https://lkml.kernel.org/r/20180602124408.8430-14-mathieu.desnoyers@efficios.com