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

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