On Thu, Apr 07, 2016 at 05:31:43PM -0700, Andy Lutomirski wrote: > Hi all- > > This whole mess is intended for x86/urgent. It fixes several bugs. > > It's probably a tiny performance regression on some workloads on > Intel CPUs. It's probably varies between a less tiny regression and > a small speedup on newer AMD CPUs. It's a bigger regression on AMD > K8. > > The AMD code could be further sped up by adding a new 'clear_gs' > pvop with a better native implementation. I don't particularly want > to deal with a backported new pvop, so I didn't do that. Maybe I'll > do it later on for new kernels, though. > > (For people who care about such things, there are probably three > bugs in here depending how you count. Somewhere between one and two > of them were independently discovered by Rudolf Marek.) > > Andy Lutomirski (5): > selftests/x86: Test the FSBASE/GSBASE API and context switching > x86/arch_prctl: Fix ARCH_GET_FS and ARCH_GET_GS > x86/cpu: Probe the behavior of nulling out a segment at boot time > x86/switch_to: Rewrite the FS and GS context switch code > x86/cpu: Move X86_BUG_ESPFIX initialization to generic_identify > > Borislav Petkov (2): > x86/cpu: Add Erratum 88 detection on AMD > x86/entry: Make gs_change a local label > > arch/x86/entry/entry_64.S | 12 +- > arch/x86/include/asm/cpufeatures.h | 3 + > arch/x86/kernel/cpu/amd.c | 1 + > arch/x86/kernel/cpu/common.c | 71 ++++-- > arch/x86/kernel/process_64.c | 167 ++++++++------ > tools/testing/selftests/x86/Makefile | 1 + > tools/testing/selftests/x86/fsgsbase.c | 398 > +++++++++++++++++++++++++++++++++ > 7 files changed, 560 insertions(+), 93 deletions(-) > create mode 100644 tools/testing/selftests/x86/fsgsbase.c
Forgot to add: Reviewed-by: Borislav Petkov <b...@suse.de> -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply.