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* [PATCH 0/3] Fix small issues in XSAVES
@ 2019-12-05 18:26 Yu-cheng Yu
  2019-12-05 18:26 ` [PATCH 1/3] x86/fpu/xstate: Fix small issues before adding supervisor xstates Yu-cheng Yu
                   ` (2 more replies)
  0 siblings, 3 replies; 14+ messages in thread
From: Yu-cheng Yu @ 2019-12-05 18:26 UTC (permalink / raw)
  To: linux-kernel, x86, H. Peter Anvin, Thomas Gleixner, Ingo Molnar,
	Dave Hansen, Tony Luck, Andy Lutomirski, Borislav Petkov,
	Rik van Riel, Ravi V. Shankar, Sebastian Andrzej Siewior,
	Fenghua Yu, Peter Zijlstra
  Cc: Yu-cheng Yu

The first two patches in this series are split from my supervisor xstate
patches [1].  The third is to fix a vital issue in __fpu_restore_sig(),
and more RFC than the others.  All three are not directly related to
supervisor xstates or CET, split them out and submit first.  I will
re-submit supervisor xstate patches shortly.

When__fpu_restore_sig() fails, partially cleared FPU registers still belong
to the previous owner task.  That causes that task to use corrupted xregs.
Fix it by doing __cpu_invalidate_fpregs_state() in functions that copy into
fpregs.  Further details are in the commit log of patch #3.

[1] Support XSAVES supervisor states
    https://lkml.kernel.org/r/20190925151022.21688-1-yu-cheng.yu@intel.com/

[2] CET patches:
    https://lkml.kernel.org/r/20190813205225.12032-1-yu-cheng.yu@intel.com/
    https://lkml.kernel.org/r/20190813205359.12196-1-yu-cheng.yu@intel.com/

Yu-cheng Yu (3):
  x86/fpu/xstate: Fix small issues before adding supervisor xstates
  x86/fpu/xstate: Make xfeature_is_supervisor()/xfeature_is_user()
    return bool
  x86/fpu/xstate: Invalidate fpregs when __fpu_restore_sig() fails

 arch/x86/include/asm/fpu/internal.h | 14 ++++++++++++++
 arch/x86/kernel/fpu/core.c          | 15 +++++++++++++--
 arch/x86/kernel/fpu/xstate.c        | 22 ++++++++++------------
 3 files changed, 37 insertions(+), 14 deletions(-)

-- 
2.17.1


^ permalink raw reply	[flat|nested] 14+ messages in thread
* [PATCH v2 0/3] Fix small issues in XSAVES
@ 2019-12-12 21:08 Yu-cheng Yu
  2019-12-12 21:08 ` [PATCH v2 3/3] x86/fpu/xstate: Invalidate fpregs when __fpu_restore_sig() fails Yu-cheng Yu
  0 siblings, 1 reply; 14+ messages in thread
From: Yu-cheng Yu @ 2019-12-12 21:08 UTC (permalink / raw)
  To: linux-kernel, x86, H. Peter Anvin, Thomas Gleixner, Ingo Molnar,
	Dave Hansen, Tony Luck, Andy Lutomirski, Borislav Petkov,
	Rik van Riel, Ravi V. Shankar, Sebastian Andrzej Siewior,
	Fenghua Yu, Peter Zijlstra
  Cc: Yu-cheng Yu

Rebase v1 to Linux v5.5-rc1.  This supersedes the previous version, but
does not have any functional changes.

The first two patches in this series are split from my supervisor xstate
patches [2].  The third is to fix a vital issue in __fpu_restore_sig(),
and more RFC than the others.  All three are not directly related to
supervisor xstates or CET, split them out and submit first.  I will
re-submit supervisor xstate patches shortly.

When__fpu_restore_sig() fails, partially cleared FPU registers still belong
to the previous owner task.  That causes that task to use corrupted xregs.
Fix it by doing __cpu_invalidate_fpregs_state() in functions that copy into
fpregs.  Further details are in the commit log of patch #3.

[1] v1 of this series:
    https://lkml.kernel.org/r/20191205182648.32257-1-yu-cheng.yu@intel.com/

[2] Support XSAVES supervisor states
    https://lkml.kernel.org/r/20190925151022.21688-1-yu-cheng.yu@intel.com/

[3] CET patches:
    https://lkml.kernel.org/r/20190813205225.12032-1-yu-cheng.yu@intel.com/
    https://lkml.kernel.org/r/20190813205359.12196-1-yu-cheng.yu@intel.com/

Yu-cheng Yu (3):
  x86/fpu/xstate: Fix small issues before adding supervisor xstates
  x86/fpu/xstate: Make xfeature_is_supervisor()/xfeature_is_user()
    return bool
  x86/fpu/xstate: Invalidate fpregs when __fpu_restore_sig() fails

 arch/x86/include/asm/fpu/internal.h | 14 ++++++++++++++
 arch/x86/kernel/fpu/core.c          | 16 ++++++++++++++--
 arch/x86/kernel/fpu/xstate.c        | 18 ++++++++----------
 3 files changed, 36 insertions(+), 12 deletions(-)

-- 
2.17.1


^ permalink raw reply	[flat|nested] 14+ messages in thread

end of thread, back to index

Thread overview: 14+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-12-05 18:26 [PATCH 0/3] Fix small issues in XSAVES Yu-cheng Yu
2019-12-05 18:26 ` [PATCH 1/3] x86/fpu/xstate: Fix small issues before adding supervisor xstates Yu-cheng Yu
2019-12-05 18:26 ` [PATCH 2/3] x86/fpu/xstate: Make xfeature_is_supervisor()/xfeature_is_user() return bool Yu-cheng Yu
2019-12-05 18:26 ` [PATCH 3/3] x86/fpu/xstate: Invalidate fpregs when __fpu_restore_sig() fails Yu-cheng Yu
2019-12-07  4:38   ` [PATCH v2 " Yu-cheng Yu
2019-12-12 21:08 [PATCH v2 0/3] Fix small issues in XSAVES Yu-cheng Yu
2019-12-12 21:08 ` [PATCH v2 3/3] x86/fpu/xstate: Invalidate fpregs when __fpu_restore_sig() fails Yu-cheng Yu
2019-12-18 15:54   ` Sebastian Andrzej Siewior
2019-12-18 20:53     ` Yu-cheng Yu
2019-12-19 14:22       ` Sebastian Andrzej Siewior
2019-12-19 16:44         ` Yu-cheng Yu
2019-12-19 17:16           ` Sebastian Andrzej Siewior
2019-12-19 17:40             ` Yu-cheng Yu
2019-12-20 20:16               ` Sebastian Andrzej Siewior
2019-12-20 20:32                 ` Yu-cheng Yu

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