kernel/tools/testing/selftests/powerpc/dexcr, branch linux-rolling-stable

selftests/powerpc: Give all tests 2 minutes timeout

2024-11-07T11:36:30Z

Each of the powerpc selftests runs with a timeout of 2 minutes by default (see tools/testing/selftests/powerpc/harness.c). But when tests are run with run_kselftest.sh it uses a timeout of 45 seconds, meaning some tests run OK standalone but fail when run with the test runner. So tell run_kselftest.sh to give each test 130 seconds, that should allow the tests to complete, or be killed by the powerpc test harness after 2 minutes. If for some reason the harness fails, or for the few tests that don't use the harness, the 130 second timeout should catch them if they get stuck. Signed-off-by: Michael Ellerman Link: https://patch.msgid.link/20241106130453.1741013-2-mpe@ellerman.id.au

selftests/powerpc/dexcr: Fix spelling mistake "predicition" -> "prediction"

2024-05-08T12:32:22Z

There is a spelling mistake in the help message. Fix it. Signed-off-by: Colin Ian King Signed-off-by: Michael Ellerman Link: https://msgid.link/20240508084117.2869261-1-colin.i.king@gmail.com

selftests/powerpc/dexcr: Add chdexcr utility

2024-05-06T12:05:17Z

Adds a utility to exercise the prctl DEXCR inheritance in the shell. Supports setting and clearing each aspect. Signed-off-by: Benjamin Gray [mpe: Use correct SPDX license, use execvp() for usability, print errors] Signed-off-by: Michael Ellerman Link: https://msgid.link/20240417112325.728010-9-bgray@linux.ibm.com

selftests/powerpc/dexcr: Add DEXCR config details to lsdexcr

2024-05-06T12:05:17Z

Now that the DEXCR can be configured with prctl, add a section in lsdexcr that explains why each aspect is set the way it is. Signed-off-by: Benjamin Gray Signed-off-by: Michael Ellerman Link: https://msgid.link/20240417112325.728010-8-bgray@linux.ibm.com

selftests/powerpc/dexcr: Attempt to enable NPHIE in hashchk selftest

2024-05-06T12:05:17Z

Now that a process can control its DEXCR to some extent, make the hashchk tests more reliable by explicitly setting the local and onexec NPHIE aspect. Signed-off-by: Benjamin Gray Signed-off-by: Michael Ellerman Link: https://msgid.link/20240417112325.728010-7-bgray@linux.ibm.com

selftests/powerpc/dexcr: Add DEXCR prctl interface test

2024-05-06T12:05:17Z

Some basic tests of the prctl interface of the DEXCR. Signed-off-by: Benjamin Gray [mpe: Add missing SPDX tag] Signed-off-by: Michael Ellerman Link: https://msgid.link/20240417112325.728010-6-bgray@linux.ibm.com

selftests/powerpc/dexcr: Add -no-pie to hashchk tests

2024-05-03T10:46:51Z

The hashchk tests want to verify that the hash key is changed over exec. It does so by calculating hashes at the same address across an exec. This is made simpler by disabling PIE functionality, so we can re-execute ourselves and be using the same addresses in the child. While -fno-pie is already added, -no-pie is also required. Fixes: bdb07f35a52f ("selftests/powerpc/dexcr: Add hashst/hashchk test") Signed-off-by: Benjamin Gray Signed-off-by: Michael Ellerman Link: https://msgid.link/20240417112325.728010-2-bgray@linux.ibm.com

selftests/powerpc: make sub-folders buildable on their own

2024-04-29T13:54:42Z

Build breaks when executing make with run_tests for sub-folders under powerpc. This is because, CFLAGS and GIT_VERSION macros are defined in Makefile of toplevel powerpc folder. make: Entering directory '/home/maddy/linux/tools/testing/selftests/powerpc/mm' gcc hugetlb_vs_thp_test.c ../harness.c ../utils.c -o /home/maddy/selftest_output//hugetlb_vs_thp_test hugetlb_vs_thp_test.c:6:10: fatal error: utils.h: No such file or directory 6 | #include "utils.h" | ^~~~~~~~~ compilation terminated. Fix this by adding the flags.mk in each sub-folder Makefile. Also remove the CFLAGS and GIT_VERSION macros from powerpc/ folder Makefile since the same is definied in flags.mk Signed-off-by: Madhavan Srinivasan Signed-off-by: Michael Ellerman Link: https://msgid.link/20240229093711.581230-3-maddy@linux.ibm.com

selftests/powerpc/dexcr: Add DEXCR status utility lsdexcr

2023-06-19T07:36:28Z

Add a utility 'lsdexcr' to print the current DEXCR status. Useful for quickly checking the status such as when debugging test failures or verifying the new default DEXCR does what you want (for userspace at least). Example output: # ./lsdexcr uDEXCR: 04000000 (NPHIE) HDEXCR: 00000000 Effective: 04000000 (NPHIE) SBHE (0): clear (Speculative branch hint enable) IBRTPD (3): clear (Indirect branch recurrent target ...) SRAPD (4): clear (Subroutine return address ...) NPHIE * (5): set (Non-privileged hash instruction enable) PHIE (6): clear (Privileged hash instruction enable) DEXCR[NPHIE] enabled: hashst/hashchk working Signed-off-by: Benjamin Gray Signed-off-by: Michael Ellerman Link: https://msgid.link/20230616034846.311705-12-bgray@linux.ibm.com

selftests/powerpc/dexcr: Add hashst/hashchk test

2023-06-19T07:36:28Z

Test the kernel DEXCR[NPHIE] interface and hashchk exception handling. Introduces with it a DEXCR utils library for common DEXCR operations. Volatile is used to prevent the compiler optimising away the signal tests. Signed-off-by: Benjamin Gray Signed-off-by: Michael Ellerman Link: https://msgid.link/20230616034846.311705-11-bgray@linux.ibm.com