# git rev-parse -q --verify c790c3d2b0ec5979d83451d0688d1cd07e23d8ba^{commit}
c790c3d2b0ec5979d83451d0688d1cd07e23d8ba
already have revision, skipping fetch
# git checkout -q -f -B kisskb c790c3d2b0ec5979d83451d0688d1cd07e23d8ba
# git clean -qxdf
# < git log -1
# commit c790c3d2b0ec5979d83451d0688d1cd07e23d8ba
# Author: Michael Ellerman <mpe@ellerman.id.au>
# Date:   Mon May 20 20:55:20 2019 +1000
# 
#     selftests/powerpc: Add a test of spectre_v2 mitigations
#     
#     This test uses the PMU to count branch prediction hits/misses for a
#     known loop, and compare the result to the reported spectre v2
#     mitigation.
#     
#     This gives us a way of sanity checking that the reported mitigation is
#     actually in effect.
#     
#     Sample output for some cases, eg:
#     
#       Power9:
#         sysfs reports: 'Vulnerable'
#          PM_BR_PRED_CCACHE: result        368 running/enabled 5792777124
#         PM_BR_MPRED_CCACHE: result        319 running/enabled 5792775546
#          PM_BR_PRED_PCACHE: result 2147483281 running/enabled 5792773128
#         PM_BR_MPRED_PCACHE: result  213604201 running/enabled 5792771640
#         Miss percent 9 %
#         OK - Measured branch prediction rates match reported spectre v2 mitigation.
#     
#         sysfs reports: 'Mitigation: Indirect branch serialisation (kernel only)'
#          PM_BR_PRED_CCACHE: result        895 running/enabled 5780320920
#         PM_BR_MPRED_CCACHE: result        822 running/enabled 5780312414
#          PM_BR_PRED_PCACHE: result 2147482754 running/enabled 5780308836
#         PM_BR_MPRED_PCACHE: result  213639731 running/enabled 5780307912
#         Miss percent 9 %
#         OK - Measured branch prediction rates match reported spectre v2 mitigation.
#     
#         sysfs reports: 'Mitigation: Indirect branch cache disabled'
#          PM_BR_PRED_CCACHE: result 2147483649 running/enabled 20540186160
#         PM_BR_MPRED_CCACHE: result 2147483649 running/enabled 20540180056
#          PM_BR_PRED_PCACHE: result          0 running/enabled 20540176090
#         PM_BR_MPRED_PCACHE: result          0 running/enabled 20540174182
#         Miss percent 100 %
#         OK - Measured branch prediction rates match reported spectre v2 mitigation.
#     
#       Power8:
#         sysfs reports: 'Vulnerable'
#          PM_BR_PRED_CCACHE: result 2147483649 running/enabled 3505888142
#         PM_BR_MPRED_CCACHE: result          9 running/enabled 3505882788
#         Miss percent 0 %
#         OK - Measured branch prediction rates match reported spectre v2 mitigation.
#     
#         sysfs reports: 'Mitigation: Indirect branch cache disabled'
#          PM_BR_PRED_CCACHE: result 2147483649 running/enabled 16931421988
#         PM_BR_MPRED_CCACHE: result 2147483649 running/enabled 16931416478
#         Miss percent 100 %
#         OK - Measured branch prediction rates match reported spectre v2 mitigation.
#         success: spectre_v2
#     
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20190520105520.22274-1-mpe@ellerman.id.au
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 c790c3d2b0ec5979d83451d0688d1cd07e23d8ba
# < make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-next_ps3_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  ps3_defconfig
# make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-next_ps3_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
Completed OK
# rm -rf /kisskb/build/powerpc-next_ps3_defconfig_powerpc-gcc5
# Build took: 0:01:41.375803