path: root/tools/testing/selftests/powerpc/security (follow)
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2018-10-31selftests: powerpc: Fix warning for security subdirJoel Stanley1-0/+1
typing 'make' inside tools/testing/selftests/powerpc gave a build warning: BUILD_TARGET=tools/testing/selftests/powerpc/security; mkdir -p $BUILD_TARGET; make OUTPUT=$BUILD_TARGET -k -C security all make[1]: Entering directory 'tools/testing/selftests/powerpc/security' ../../lib.mk:20: ../../../../scripts/subarch.include: No such file or directory make[1]: *** No rule to make target '../../../../scripts/subarch.include'. make[1]: Failed to remake makefile '../../../../scripts/subarch.include'. The build is one level deeper than lib.mk thinks it is. Set top_srcdir to set things straight. Note that the test program is still built. Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-10-30selftests/powerpc: Relax L1d miss targets for rfi_flush testNaveen N. Rao1-5/+13
When running the rfi_flush test, if the system is loaded, we see two issues: 1. The L1d misses when rfi_flush is disabled increase significantly due to other workloads interfering with the cache. 2. The L1d misses when rfi_flush is enabled sometimes goes slightly below the expected number of misses. To address these, let's relax the expected number of L1d misses: 1. When rfi_flush is disabled, we allow upto half the expected number of the misses for when rfi_flush is enabled. 2. When rfi_flush is enabled, we allow ~1% lower number of cache misses. Reported-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Tested-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-10-20selftests/powerpc: Add test to verify rfi flush across a system callNaveen N. Rao2-0/+141
This adds a test to verify proper functioning of the rfi flush capability implemented to mitigate meltdown. The test works by measuring the number of L1d cache misses encountered while loading data from memory. Across a system call, since the L1d cache is flushed when rfi_flush is enabled, the number of cache misses is expected to be relative to the number of cachelines corresponding to the data being loaded. The current system setting is reflected via powerpc/rfi_flush under debugfs (assumed to be /sys/kernel/debug/). This test verifies the expected result with rfi_flush enabled as well as when it is disabled. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> [mpe: Add SPDX tags, clang format, skip if the debugfs is missing, use __u64 and SANE_USERSPACE_TYPES to avoid printf() build errors.] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>