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4185b3b927
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
47 lines
878 B
Bash
Executable file
47 lines
878 B
Bash
Executable file
#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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#
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# Load kernel module for FPU tests
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uid=$(id -u)
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if [ $uid -ne 0 ]; then
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echo "$0: Must be run as root"
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exit 1
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fi
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if ! which modprobe > /dev/null 2>&1; then
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echo "$0: You need modprobe installed"
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exit 4
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fi
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if ! modinfo test_fpu > /dev/null 2>&1; then
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echo "$0: You must have the following enabled in your kernel:"
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echo "CONFIG_TEST_FPU=m"
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exit 4
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fi
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NR_CPUS=$(getconf _NPROCESSORS_ONLN)
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if [ ! $NR_CPUS ]; then
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NR_CPUS=1
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fi
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modprobe test_fpu
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if [ ! -e /sys/kernel/debug/selftest_helpers/test_fpu ]; then
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mount -t debugfs none /sys/kernel/debug
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if [ ! -e /sys/kernel/debug/selftest_helpers/test_fpu ]; then
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echo "$0: Error mounting debugfs"
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exit 4
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fi
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fi
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echo "Running 1000 iterations on all CPUs... "
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for i in $(seq 1 1000); do
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for c in $(seq 1 $NR_CPUS); do
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./test_fpu &
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done
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done
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rmmod test_fpu
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