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* [patch V2 00/28] x86/speculation: Remedy the STIBP/IBPB overhead
@ 2018-11-25 18:33 Thomas Gleixner
  2018-11-25 18:33 ` [patch V2 01/28] x86/speculation: Update the TIF_SSBD comment Thomas Gleixner
                   ` (30 more replies)
  0 siblings, 31 replies; 112+ messages in thread
From: Thomas Gleixner @ 2018-11-25 18:33 UTC (permalink / raw)
  To: LKML
  Cc: x86, Peter Zijlstra, Andy Lutomirski, Linus Torvalds,
	Jiri Kosina, Tom Lendacky, Josh Poimboeuf, Andrea Arcangeli,
	David Woodhouse, Tim Chen, Andi Kleen, Dave Hansen,
	Casey Schaufler, Asit Mallick, Arjan van de Ven, Jon Masters,
	Waiman Long, Greg KH, Dave Stewart, Kees Cook

Thats hopefully the final version of this. Changes since V1:

  - Renamed the command line option and related code to spectre_v2_user= as
    suggested by Josh.

  - Thought more about the back to back optimization and finally left the
    IBPB code in switch_mm().

    It still removes the ptrace check for the always IBPB case. That's
    substantial overhead for dubious value now that the default is
    conditional (prctl/seccomp) IBPB.

  - Added two options which allow conditional STIBP and IBPB always mode.

  - Addressed the review comments

Documentation is still work in progress. Thanks Andi for providing the
first draft for it.

Still based on tip.git x86/pti as it has been discussed to remove the
minimal RETPOLINE bandaid from stable kernels as well.

It's avaiable from git:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/pti


Thanks,

	tglx

8<------------------------

 Documentation/admin-guide/kernel-parameters.txt |   56 ++
 Documentation/userspace-api/spec_ctrl.rst       |    9 
 arch/x86/Kconfig                                |    8 
 arch/x86/include/asm/msr-index.h                |    5 
 arch/x86/include/asm/nospec-branch.h            |   14 
 arch/x86/include/asm/spec-ctrl.h                |   18 
 arch/x86/include/asm/switch_to.h                |    3 
 arch/x86/include/asm/thread_info.h              |   18 
 arch/x86/include/asm/tlbflush.h                 |    8 
 arch/x86/kernel/cpu/bugs.c                      |  520 ++++++++++++++++++------
 arch/x86/kernel/process.c                       |   79 ++-
 arch/x86/kernel/process.h                       |   39 +
 arch/x86/kernel/process_32.c                    |   10 
 arch/x86/kernel/process_64.c                    |   10 
 arch/x86/mm/tlb.c                               |  109 +++--
 include/linux/ptrace.h                          |   17 
 include/linux/sched.h                           |    9 
 include/linux/sched/smt.h                       |   20 
 include/uapi/linux/prctl.h                      |    1 
 kernel/cpu.c                                    |   15 
 kernel/ptrace.c                                 |   10 
 kernel/sched/core.c                             |   19 
 kernel/sched/sched.h                            |    4 
 tools/include/uapi/linux/prctl.h                |    1 
 24 files changed, 745 insertions(+), 257 deletions(-)


^ permalink raw reply	[flat|nested] 112+ messages in thread

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Thread overview: 112+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-11-25 18:33 [patch V2 00/28] x86/speculation: Remedy the STIBP/IBPB overhead Thomas Gleixner
2018-11-25 18:33 ` [patch V2 01/28] x86/speculation: Update the TIF_SSBD comment Thomas Gleixner
2018-11-28 14:20   ` [tip:x86/pti] " tip-bot for Tim Chen
2018-11-29 14:27   ` [patch V2 01/28] " Konrad Rzeszutek Wilk
2018-11-25 18:33 ` [patch V2 02/28] x86/speculation: Clean up spectre_v2_parse_cmdline() Thomas Gleixner
2018-11-28 14:20   ` [tip:x86/pti] " tip-bot for Tim Chen
2018-11-29 14:28   ` [patch V2 02/28] " Konrad Rzeszutek Wilk
2018-11-25 18:33 ` [patch V2 03/28] x86/speculation: Remove unnecessary ret variable in cpu_show_common() Thomas Gleixner
2018-11-28 14:21   ` [tip:x86/pti] " tip-bot for Tim Chen
2018-11-29 14:28   ` [patch V2 03/28] " Konrad Rzeszutek Wilk
2018-11-25 18:33 ` [patch V2 04/28] x86/speculation: Reorganize cpu_show_common() Thomas Gleixner
2018-11-26 15:08   ` Borislav Petkov
2018-11-28 14:22   ` [tip:x86/pti] x86/speculation: Move STIPB/IBPB string conditionals out of cpu_show_common() tip-bot for Tim Chen
2018-11-29 14:29   ` [patch V2 04/28] x86/speculation: Reorganize cpu_show_common() Konrad Rzeszutek Wilk
2018-11-25 18:33 ` [patch V2 05/28] x86/speculation: Disable STIBP when enhanced IBRS is in use Thomas Gleixner
2018-11-28 14:22   ` [tip:x86/pti] " tip-bot for Tim Chen
2018-11-29 14:35   ` [patch V2 05/28] " Konrad Rzeszutek Wilk
2018-11-25 18:33 ` [patch V2 06/28] x86/speculation: Rename SSBD update functions Thomas Gleixner
2018-11-26 15:24   ` Borislav Petkov
2018-11-28 14:23   ` [tip:x86/pti] " tip-bot for Thomas Gleixner
2018-11-29 14:37   ` [patch V2 06/28] " Konrad Rzeszutek Wilk
2018-11-25 18:33 ` [patch V2 07/28] x86/speculation: Reorganize speculation control MSRs update Thomas Gleixner
2018-11-26 15:47   ` Borislav Petkov
2018-11-28 14:23   ` [tip:x86/pti] " tip-bot for Tim Chen
2018-11-29 14:41   ` [patch V2 07/28] " Konrad Rzeszutek Wilk
2018-11-25 18:33 ` [patch V2 08/28] sched/smt: Make sched_smt_present track topology Thomas Gleixner
2018-11-28 14:24   ` [tip:x86/pti] " tip-bot for Peter Zijlstra (Intel)
2018-11-29 14:42   ` [patch V2 08/28] " Konrad Rzeszutek Wilk
2018-11-29 14:50     ` Konrad Rzeszutek Wilk
2018-11-29 15:48       ` Peter Zijlstra
2018-11-25 18:33 ` [patch V2 09/28] x86/Kconfig: Select SCHED_SMT if SMP enabled Thomas Gleixner
2018-11-28 14:24   ` [tip:x86/pti] " tip-bot for Thomas Gleixner
2018-11-29 14:44   ` [patch V2 09/28] " Konrad Rzeszutek Wilk
2018-11-25 18:33 ` [patch V2 10/28] sched/smt: Expose sched_smt_present static key Thomas Gleixner
2018-11-28 14:25   ` [tip:x86/pti] " tip-bot for Thomas Gleixner
2018-11-29 14:44   ` [patch V2 10/28] " Konrad Rzeszutek Wilk
2018-11-25 18:33 ` [patch V2 11/28] x86/speculation: Rework SMT state change Thomas Gleixner
2018-11-28 14:26   ` [tip:x86/pti] " tip-bot for Thomas Gleixner
2018-11-25 18:33 ` [patch V2 12/28] x86/l1tf: Show actual SMT state Thomas Gleixner
2018-11-28 14:26   ` [tip:x86/pti] " tip-bot for Thomas Gleixner
2018-11-25 18:33 ` [patch V2 13/28] x86/speculation: Reorder the spec_v2 code Thomas Gleixner
2018-11-26 22:21   ` Borislav Petkov
2018-11-28 14:27   ` [tip:x86/pti] " tip-bot for Thomas Gleixner
2018-11-25 18:33 ` [patch V2 14/28] x86/speculation: Mark string arrays const correctly Thomas Gleixner
2018-11-28 14:27   ` [tip:x86/pti] " tip-bot for Thomas Gleixner
2018-11-25 18:33 ` [patch V2 15/28] x86/speculataion: Mark command line parser data __initdata Thomas Gleixner
2018-11-28 14:28   ` [tip:x86/pti] " tip-bot for Thomas Gleixner
2018-11-25 18:33 ` [patch V2 16/28] x86/speculation: Unify conditional spectre v2 print functions Thomas Gleixner
2018-11-28 14:29   ` [tip:x86/pti] " tip-bot for Thomas Gleixner
2018-11-25 18:33 ` [patch V2 17/28] x86/speculation: Add command line control for indirect branch speculation Thomas Gleixner
2018-11-28 14:29   ` [tip:x86/pti] " tip-bot for Thomas Gleixner
2018-11-25 18:33 ` [patch V2 18/28] x86/speculation: Prepare for per task indirect branch speculation control Thomas Gleixner
2018-11-27 17:25   ` Lendacky, Thomas
2018-11-27 19:51     ` Tim Chen
2018-11-28  9:39       ` Thomas Gleixner
2018-11-27 20:39     ` Thomas Gleixner
2018-11-27 20:42       ` Thomas Gleixner
2018-11-27 21:52         ` Lendacky, Thomas
2018-11-28 14:30   ` [tip:x86/pti] " tip-bot for Tim Chen
2018-11-25 18:33 ` [patch V2 19/28] x86/process: Consolidate and simplify switch_to_xtra() code Thomas Gleixner
2018-11-26 18:30   ` Borislav Petkov
2018-11-28 14:30   ` [tip:x86/pti] " tip-bot for Thomas Gleixner
2018-11-25 18:33 ` [patch V2 20/28] x86/speculation: Avoid __switch_to_xtra() calls Thomas Gleixner
2018-11-28 14:31   ` [tip:x86/pti] " tip-bot for Thomas Gleixner
2018-11-25 18:33 ` [patch V2 21/28] x86/speculation: Prepare for conditional IBPB in switch_mm() Thomas Gleixner
2018-11-25 19:11   ` Thomas Gleixner
2018-11-25 20:53   ` Andi Kleen
2018-11-25 22:20     ` Thomas Gleixner
2018-11-25 23:04       ` Andy Lutomirski
2018-11-26  7:10         ` Thomas Gleixner
2018-11-26 13:36           ` Ingo Molnar
2018-11-26  3:07       ` Andi Kleen
2018-11-26  6:50         ` Thomas Gleixner
2018-11-28 14:31   ` [tip:x86/pti] " tip-bot for Thomas Gleixner
2018-11-25 18:33 ` [patch V2 22/28] ptrace: Remove unused ptrace_may_access_sched() and MODE_IBRS Thomas Gleixner
2018-11-28 14:32   ` [tip:x86/pti] " tip-bot for Thomas Gleixner
2018-11-25 18:33 ` [patch V2 23/28] x86/speculation: Split out TIF update Thomas Gleixner
2018-11-28 14:33   ` [tip:x86/pti] " tip-bot for Thomas Gleixner
2018-11-25 18:33 ` [patch V2 24/28] x86/speculation: Prepare arch_smt_update() for PRCTL mode Thomas Gleixner
2018-11-27 20:18   ` Lendacky, Thomas
2018-11-27 20:30     ` Thomas Gleixner
2018-11-27 21:20       ` Lendacky, Thomas
2018-11-28 14:34   ` [tip:x86/pti] " tip-bot for Thomas Gleixner
2018-11-25 18:33 ` [patch V2 25/28] x86/speculation: Add prctl() control for indirect branch speculation Thomas Gleixner
2018-11-28 14:34   ` [tip:x86/pti] " tip-bot for Thomas Gleixner
2018-11-25 18:33 ` [patch V2 26/28] x86/speculation: Enable prctl mode for spectre_v2_user Thomas Gleixner
2018-11-26  7:56   ` Dominik Brodowski
2018-11-28 14:35   ` [tip:x86/pti] " tip-bot for Thomas Gleixner
2018-11-25 18:33 ` [patch V2 27/28] x86/speculation: Add seccomp Spectre v2 user space protection mode Thomas Gleixner
2018-11-25 19:35   ` Randy Dunlap
2018-11-25 20:40   ` Linus Torvalds
2018-11-25 20:52     ` Jiri Kosina
2018-11-25 22:28     ` Thomas Gleixner
2018-11-26 13:30       ` Ingo Molnar
2018-11-26 20:48       ` Andrea Arcangeli
2018-11-26 20:58         ` Thomas Gleixner
2018-11-26 21:52           ` Lendacky, Thomas
2018-11-27  0:37             ` Tim Chen
2018-12-04  1:38     ` Tim Chen
2018-12-04  8:39       ` Jiri Kosina
2018-12-04  9:43         ` Arjan van de Ven
2018-12-04  9:46         ` Arjan van de Ven
2018-12-04 17:20       ` Linus Torvalds
2018-12-04 18:58         ` Tim Chen
2018-11-28 14:35   ` [tip:x86/pti] " tip-bot for Thomas Gleixner
2018-12-04 18:45   ` [patch V2 27/28] " Dave Hansen
2018-11-25 18:33 ` [patch V2 28/28] x86/speculation: Provide IBPB always command line options Thomas Gleixner
2018-11-28 14:36   ` [tip:x86/pti] " tip-bot for Thomas Gleixner
2018-11-26 13:37 ` [patch V2 00/28] x86/speculation: Remedy the STIBP/IBPB overhead Ingo Molnar
2018-11-28 14:24 ` Thomas Gleixner
2018-11-29 19:02   ` Tim Chen
2018-12-10 23:43 ` Pavel Machek

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