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| author |   Petteri Aimonen <jpa@git.mail.kapsi.fi> | 2020-06-18 16:37:37 +0200 |
|---|---|---|
| committer |   Borislav Petkov <bp@suse.de> | 2020-06-29 10:02:23 +0200 |
| commit | 4185b3b92792eaec5869266e594338343421ffb0 (patch) | |
| tree | ac708daf001002b2058ff899c74462500684e85c /lib/Kconfig.debug | |
| parent | x86/fpu: Reset MXCSR to default in kernel_fpu_begin() (diff) | |
| download | linux-dev-4185b3b92792eaec5869266e594338343421ffb0.tar.xz linux-dev-4185b3b92792eaec5869266e594338343421ffb0.zip | |
selftests/fpu: Add an FPU selftest
Add a selftest for the usage of FPU code in kernel mode.
Currently only implemented for x86. In the future, kernel FPU testing
could be unified between the different architectures supporting it.
[ bp:
- Split out from a conglomerate patch, put comments over statements.
- run the test only on debugfs write.
- Add bare-minimum run_test_fpu.sh, run 1000 iterations on all CPUs
by default.
- Add conditionally -msse2 so that clang doesn't generate library
calls.
- Use cc-option to detect gcc 7.1 not supporting -mpreferred-stack-boundary=3 (amluto).
- Document stuff so that we don't forget.
- Fix:
ld: lib/test_fpu.o: in function `test_fpu_get':
>> test_fpu.c:(.text+0x16e): undefined reference to `__sanitizer_cov_trace_cmpd'
>> ld: test_fpu.c:(.text+0x1a7): undefined reference to `__sanitizer_cov_trace_cmpd'
ld: test_fpu.c:(.text+0x1e0): undefined reference to `__sanitizer_cov_trace_cmpd'
]
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Petteri Aimonen <jpa@git.mail.kapsi.fi>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Link: https://lkml.kernel.org/r/20200624114646.28953-3-bp@alien8.de
Diffstat (limited to 'lib/Kconfig.debug')
| -rw-r--r-- | lib/Kconfig.debug | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 9ad9210d70a1..5842885ab184 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -2307,6 +2307,17 @@ config TEST_HMM If unsure, say N. +config TEST_FPU + tristate "Test floating point operations in kernel space" + depends on X86 && !KCOV_INSTRUMENT_ALL + help + Enable this option to add /sys/kernel/debug/selftest_helpers/test_fpu + which will trigger a sequence of floating point operations. This is used + for self-testing floating point control register setting in + kernel_fpu_begin(). + + If unsure, say N. + endif # RUNTIME_TESTING_MENU config MEMTEST |