[CRIU] [PATCH 0/8] x86/ptrace: Workaround Skylake bug

[Mike Rapoport]

(actually CC'ing Shlomi ;-) )

On Wed, Jan 31, 2018 at 04:58:07PM +0000, Dmitry Safonov wrote:
> A nasty kernel(older v4.14) bug, resulted in incorrect C/R of fpu state.
> 
> Tested on Skylake Amazon VM with zdtm's fpu tests and fpu02..
> Travis: https://travis-ci.org/0x7f454c46/criu/builds/335709842
> Shlomi, will you be able by any chance to test this with your python
> project and older kernel (ubuntu v4.13)?
> 
> Cc: Cyrill Gorcunov <gorcunov at gmail.com>
> Cc: Andrei Vagin <avagin at virtuozzo.com>
> Cc: Shlomi Matichin <shlomi at binaris.com>
> 
> Dmitry Safonov (8):
>   x86/crtools: Add fork() err-path handle
>   x86/kerndat: Add a check for ptrace() bug on Skylake
>   compel/infect: Unite save_regs_t with save_regs() declaration
>   compel: Add ctx flags to get_task_regs()
>   compel/x86: Separate functions used to get fpu state
>   compel/x86: Add workaround on ptrace() bug on Skylake
>   compel: Cleanup INFECT_* definitions
>   zdtm/x86: Add a mxcsr preserving fpu test
> 
>  compel/arch/aarch64/src/lib/infect.c |  3 +-
>  compel/arch/arm/src/lib/infect.c     |  3 +-
>  compel/arch/ppc64/src/lib/infect.c   |  3 +-
>  compel/arch/s390/src/lib/infect.c    |  2 +-
>  compel/arch/x86/src/lib/infect.c     | 57 +++++++++++++++++------
>  compel/include/infect-priv.h         |  3 +-
>  compel/include/uapi/infect.h         | 21 ++++++---
>  compel/src/lib/infect.c              |  5 +-
>  criu/arch/x86/crtools.c              | 80 +++++++++++++++++++++++++++++++-
>  criu/arch/x86/include/asm/restorer.h |  2 +
>  criu/include/kerndat.h               |  1 +
>  criu/kerndat.c                       | 18 ++++++++
>  criu/parasite-syscall.c              |  2 +
>  test/zdtm/static/Makefile            |  1 +
>  test/zdtm/static/fpu02.c             | 88 ++++++++++++++++++++++++++++++++++++
>  15 files changed, 259 insertions(+), 30 deletions(-)
>  create mode 100644 test/zdtm/static/fpu02.c
> 
> -- 
> 2.13.6
> 
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-- 
Sincerely yours,
Mike.