[PATCH 0/3] Fix small issues in XSAVES

[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@xxxxxxxxx/

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

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