Hello, this is patchset adding barrier_nospec on powerpc. It is based on the out-of-tree gmb() patch and the existing rfi patches.
I do not have the tests for the Spectre/Meltdown issues available so this is untested. Feedback on the general approach as well as actual effectivity is welcome. Thanks Michal Michal Suchanek (8): powerpc: Add barrier_nospec powerpc: Use barrier_nospec in copy_from_user powerpc/64: Use barrier_nospec in syscall entry powerpc/64s: Add support for ori barrier_nospec powerpc/64: Patch barrier_nospec in modules powerpc/64: barrier_nospec: Add debugfs trigger powerpc/64s: barrier_nospec: Add hcall triggerr powerpc/64: barrier_nospec: Add commandline trigger arch/powerpc/include/asm/barrier.h | 9 ++++ arch/powerpc/include/asm/feature-fixups.h | 9 ++++ arch/powerpc/include/asm/setup.h | 11 +++++ arch/powerpc/include/asm/uaccess.h | 11 ++++- arch/powerpc/kernel/entry_64.S | 3 ++ arch/powerpc/kernel/module.c | 6 +++ arch/powerpc/kernel/setup_64.c | 72 +++++++++++++++++++++++++++++++ arch/powerpc/kernel/vmlinux.lds.S | 7 +++ arch/powerpc/lib/feature-fixups.c | 38 ++++++++++++++++ arch/powerpc/platforms/pseries/setup.c | 38 ++++++++++------ 10 files changed, 190 insertions(+), 14 deletions(-) -- 2.13.6
