All of lore.kernel.org
 help / color / mirror / Atom feed
* [PATCH 0/8] Re-enable ENQCMD and PASID MSR
@ 2021-09-20 19:23 ` Fenghua Yu
  0 siblings, 0 replies; 154+ messages in thread
From: Fenghua Yu @ 2021-09-20 19:23 UTC (permalink / raw)
  To: Thomas Gleixner, Ingo Molnar, Borislav Petkov, Peter Zijlstra,
	Andy Lutomirski, Dave Hansen, Tony Luck, Lu Baolu, Joerg Roedel,
	Josh Poimboeuf, Dave Jiang, Jacob Jun Pan, Ashok Raj,
	Ravi V Shankar
  Cc: Fenghua Yu, iommu, x86, linux-kernel

Since updating PASID (Process Address Space ID) MSR through IPI has a few
issues that are beyond repair, Thomas disables ENQCMD [1].

Please check Documentation/x86/sva.rst for various concepts and terms
related to PASID, ENQCMD, SVM (Shared Virtual Memory), etc.

This series re-enables ENQCMD and IA32_PASID MSR by using a #GP fix up
method previously published in [2]. A PASID is allocated to a mm once
a SVM is bound to the mm via intel_svm_bind() API. The #GP fix up method
updates the PASID MSR from the mm's PASID in #GP handler when one thread
in a process executes ENQCMD for the first time and one reference is taken
to the PASID. Once the MSR is uploaded, the thread keeps and can use it
for the rest life time of the thread. In exit(2) or unbind, the PASID's
reference is dropped and the PASID is freed if there is no reference.

References:
1. ENQCMD was disabled in upstream due to serious issues:
https://lore.kernel.org/linux-iommu/87mtsd6gr9.ffs@nanos.tec.linutronix.de/

2. #GP fix up PASID MSR:
https://lore.kernel.org/linux-iommu/1594684087-61184-1-git-send-email-fenghua.yu@intel.com/

Fenghua Yu (7):
  iommu/vt-d: Clean up unused PASID updating functions
  x86/process: Clear PASID state for a newly forked/cloned thread
  x86/traps: Demand-populate PASID MSR via #GP
  x86/mmu: Add mm-based PASID refcounting
  x86/cpufeatures: Re-enable ENQCMD
  tools/objtool: Check for use of the ENQCMD instruction in the kernel
  docs: x86: Change documentation for SVA (Shared Virtual Addressing)

Peter Zijlstra (1):
  sched: Define and initialize a flag to identify valid PASID in the
    task

 Documentation/x86/sva.rst                | 81 ++++++++++++++++++--
 arch/x86/include/asm/disabled-features.h |  7 +-
 arch/x86/include/asm/fpu/api.h           |  6 +-
 arch/x86/include/asm/iommu.h             |  8 ++
 arch/x86/include/asm/mmu_context.h       |  2 +
 arch/x86/kernel/fpu/xstate.c             | 59 +++++++++++++++
 arch/x86/kernel/process.c                |  8 ++
 arch/x86/kernel/traps.c                  | 12 +++
 drivers/iommu/intel/svm.c                | 95 ++++++++++++++++++------
 include/linux/sched.h                    |  4 +
 kernel/fork.c                            |  4 +
 tools/objtool/arch/x86/decode.c          | 10 ++-
 tools/objtool/check.c                    | 20 +++++
 tools/objtool/include/objtool/arch.h     |  1 +
 14 files changed, 283 insertions(+), 34 deletions(-)

-- 
2.33.0

_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

^ permalink raw reply	[flat|nested] 154+ messages in thread

end of thread, other threads:[~2021-09-30  0:44 UTC | newest]

Thread overview: 154+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-09-20 19:23 [PATCH 0/8] Re-enable ENQCMD and PASID MSR Fenghua Yu
2021-09-20 19:23 ` Fenghua Yu
2021-09-20 19:23 ` [PATCH 1/8] iommu/vt-d: Clean up unused PASID updating functions Fenghua Yu
2021-09-20 19:23   ` Fenghua Yu
2021-09-29  7:34   ` Lu Baolu
2021-09-29  7:34     ` Lu Baolu
2021-09-30  0:40     ` Fenghua Yu
2021-09-30  0:40       ` Fenghua Yu
2021-09-20 19:23 ` [PATCH 2/8] x86/process: Clear PASID state for a newly forked/cloned thread Fenghua Yu
2021-09-20 19:23   ` Fenghua Yu
2021-09-20 19:23 ` [PATCH 3/8] sched: Define and initialize a flag to identify valid PASID in the task Fenghua Yu
2021-09-20 19:23   ` Fenghua Yu
2021-09-20 19:23 ` [PATCH 4/8] x86/traps: Demand-populate PASID MSR via #GP Fenghua Yu
2021-09-20 19:23   ` Fenghua Yu
2021-09-22 21:07   ` Peter Zijlstra
2021-09-22 21:07     ` Peter Zijlstra
2021-09-22 21:11     ` Peter Zijlstra
2021-09-22 21:11       ` Peter Zijlstra
2021-09-22 21:26       ` Luck, Tony
2021-09-22 21:26         ` Luck, Tony
2021-09-23  7:03         ` Peter Zijlstra
2021-09-23  7:03           ` Peter Zijlstra
2021-09-22 21:33       ` Dave Hansen
2021-09-22 21:33         ` Dave Hansen
2021-09-23  7:05         ` Peter Zijlstra
2021-09-23  7:05           ` Peter Zijlstra
2021-09-22 21:36       ` Fenghua Yu
2021-09-22 21:36         ` Fenghua Yu
2021-09-22 23:39     ` Fenghua Yu
2021-09-22 23:39       ` Fenghua Yu
2021-09-23 17:14     ` Luck, Tony
2021-09-23 17:14       ` Luck, Tony
2021-09-24 13:37       ` Peter Zijlstra
2021-09-24 13:37         ` Peter Zijlstra
2021-09-24 15:39         ` Luck, Tony
2021-09-24 15:39           ` Luck, Tony
2021-09-29  9:00           ` Peter Zijlstra
2021-09-29  9:00             ` Peter Zijlstra
2021-09-23 11:31   ` Thomas Gleixner
2021-09-23 11:31     ` Thomas Gleixner
2021-09-23 23:17   ` Andy Lutomirski
2021-09-23 23:17     ` Andy Lutomirski
2021-09-24  2:56     ` Fenghua Yu
2021-09-24  2:56       ` Fenghua Yu
2021-09-24  5:12       ` Andy Lutomirski
2021-09-24  5:12         ` Andy Lutomirski
2021-09-27 21:02     ` Luck, Tony
2021-09-27 21:02       ` Luck, Tony
2021-09-27 23:51       ` Dave Hansen
2021-09-27 23:51         ` Dave Hansen
2021-09-28 18:50         ` Luck, Tony
2021-09-28 18:50           ` Luck, Tony
2021-09-28 19:19           ` Dave Hansen
2021-09-28 19:19             ` Dave Hansen
2021-09-28 20:28             ` Luck, Tony
2021-09-28 20:28               ` Luck, Tony
2021-09-28 20:55               ` Dave Hansen
2021-09-28 20:55                 ` Dave Hansen
2021-09-28 23:10                 ` Luck, Tony
2021-09-28 23:10                   ` Luck, Tony
2021-09-28 23:50                   ` Fenghua Yu
2021-09-28 23:50                     ` Fenghua Yu
2021-09-29  0:08                     ` Luck, Tony
2021-09-29  0:08                       ` Luck, Tony
2021-09-29  0:26                       ` Yu, Fenghua
2021-09-29  0:26                         ` Yu, Fenghua
2021-09-29  1:06                         ` Luck, Tony
2021-09-29  1:06                           ` Luck, Tony
2021-09-29  1:16                           ` Fenghua Yu
2021-09-29  1:16                             ` Fenghua Yu
2021-09-29  2:11                             ` Luck, Tony
2021-09-29  2:11                               ` Luck, Tony
2021-09-29  1:56                       ` Yu, Fenghua
2021-09-29  1:56                         ` Yu, Fenghua
2021-09-29  2:15                         ` Luck, Tony
2021-09-29  2:15                           ` Luck, Tony
2021-09-29 16:58                   ` Andy Lutomirski
2021-09-29 16:58                     ` Andy Lutomirski
2021-09-29 17:07                     ` Luck, Tony
2021-09-29 17:07                       ` Luck, Tony
2021-09-29 17:48                       ` Andy Lutomirski
2021-09-29 17:48                         ` Andy Lutomirski
2021-09-20 19:23 ` [PATCH 5/8] x86/mmu: Add mm-based PASID refcounting Fenghua Yu
2021-09-20 19:23   ` Fenghua Yu
2021-09-23  5:43   ` Lu Baolu
2021-09-23  5:43     ` Lu Baolu
2021-09-30  0:44     ` Fenghua Yu
2021-09-30  0:44       ` Fenghua Yu
2021-09-23 14:36   ` Thomas Gleixner
2021-09-23 14:36     ` Thomas Gleixner
2021-09-23 16:40     ` Luck, Tony
2021-09-23 16:40       ` Luck, Tony
2021-09-23 17:48       ` Thomas Gleixner
2021-09-23 17:48         ` Thomas Gleixner
2021-09-24 13:18         ` Thomas Gleixner
2021-09-24 13:18           ` Thomas Gleixner
2021-09-24 16:12           ` Luck, Tony
2021-09-24 16:12             ` Luck, Tony
2021-09-24 23:03             ` Andy Lutomirski
2021-09-24 23:03               ` Andy Lutomirski
2021-09-24 23:11               ` Luck, Tony
2021-09-24 23:11                 ` Luck, Tony
2021-09-29  9:54               ` Peter Zijlstra
2021-09-29  9:54                 ` Peter Zijlstra
2021-09-29 12:28                 ` Thomas Gleixner
2021-09-29 12:28                   ` Thomas Gleixner
2021-09-29 16:51                   ` Luck, Tony
2021-09-29 16:51                     ` Luck, Tony
2021-09-29 17:07                     ` Fenghua Yu
2021-09-29 17:07                       ` Fenghua Yu
2021-09-29 16:59                   ` Andy Lutomirski
2021-09-29 16:59                     ` Andy Lutomirski
2021-09-29 17:15                     ` Thomas Gleixner
2021-09-29 17:15                       ` Thomas Gleixner
2021-09-29 17:41                       ` Luck, Tony
2021-09-29 17:41                         ` Luck, Tony
2021-09-29 17:46                         ` Andy Lutomirski
2021-09-29 17:46                           ` Andy Lutomirski
2021-09-29 18:07                         ` Fenghua Yu
2021-09-29 18:07                           ` Fenghua Yu
2021-09-29 18:31                           ` Luck, Tony
2021-09-29 18:31                             ` Luck, Tony
2021-09-29 20:07                             ` Thomas Gleixner
2021-09-29 20:07                               ` Thomas Gleixner
2021-09-24 16:12           ` Fenghua Yu
2021-09-24 16:12             ` Fenghua Yu
2021-09-25 23:13             ` Thomas Gleixner
2021-09-25 23:13               ` Thomas Gleixner
2021-09-28 16:36               ` Fenghua Yu
2021-09-28 16:36                 ` Fenghua Yu
2021-09-23 23:09   ` Andy Lutomirski
2021-09-23 23:09     ` Andy Lutomirski
2021-09-23 23:22     ` Luck, Tony
2021-09-23 23:22       ` Luck, Tony
2021-09-24  5:17       ` Andy Lutomirski
2021-09-24  5:17         ` Andy Lutomirski
2021-09-20 19:23 ` [PATCH 6/8] x86/cpufeatures: Re-enable ENQCMD Fenghua Yu
2021-09-20 19:23   ` Fenghua Yu
2021-09-20 19:23 ` [PATCH 7/8] tools/objtool: Check for use of the ENQCMD instruction in the kernel Fenghua Yu
2021-09-20 19:23   ` Fenghua Yu
2021-09-22 21:03   ` Peter Zijlstra
2021-09-22 21:03     ` Peter Zijlstra
2021-09-22 23:44     ` Fenghua Yu
2021-09-22 23:44       ` Fenghua Yu
2021-09-23  7:17       ` Peter Zijlstra
2021-09-23  7:17         ` Peter Zijlstra
2021-09-23 15:26         ` Fenghua Yu
2021-09-23 15:26           ` Fenghua Yu
2021-09-24  0:55           ` Josh Poimboeuf
2021-09-24  0:55             ` Josh Poimboeuf
2021-09-24  0:57             ` Fenghua Yu
2021-09-24  0:57               ` Fenghua Yu
2021-09-20 19:23 ` [PATCH 8/8] docs: x86: Change documentation for SVA (Shared Virtual Addressing) Fenghua Yu
2021-09-20 19:23   ` Fenghua Yu

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.