linux-kernel - Re: [PATCH for 5.2 00/12] Restartable Sequences selftests updates

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Date:   Fri, 3 May 2019 14:36:02 -0400 (EDT)
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     shuah <shuah@...nel.org>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        linux-api <linux-api@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Andy Lutomirski <luto@...capital.net>,
        Dave Watson <davejwatson@...com>, Paul Turner <pjt@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Russell King <linux@....linux.org.uk>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Andi Kleen <andi@...stfloor.org>,
        Chris Lameter <cl@...ux.com>, Ben Maurer <bmaurer@...com>,
        rostedt <rostedt@...dmis.org>,
        Josh Triplett <josh@...htriplett.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Joel Fernandes <joelaf@...gle.com>
Subject: Re: [PATCH for 5.2 00/12] Restartable Sequences selftests updates

----- On Apr 29, 2019, at 11:27 AM, Mathieu Desnoyers mathieu.desnoyers@...icios.com wrote:

> Those rseq selftests updates are hereby submitted to Shuah Khan,
> maintainer of kernel selftests, for the next merge window (5.2).
> 
> They change the per-architecture pre-abort signatures to ensure those
> are valid trap instructions.
> 
> The way exit points are presented to debuggers is enhanced, ensuring
> all exit points are present, so debuggers don't have to disassemble
> rseq critical section to properly skip over them.
> 
> Discussions with the glibc community is reaching a concensus of exposing
> a __rseq_handled symbol from glibc to coexist with rseq early adopters.
> Update the rseq selftest code to expose and use this symbol.
> 
> Support for compiling asm goto with clang is added with the
> "-no-integrated-as" compiler switch, similarly to the toplevel kernel
> Makefile.

Hi Shuah,

Is there anything else you need before you can pick up those patches ?

Thanks,

Mathieu

> 
> Thanks,
> 
> Mathieu
> 
> Martin Schwidefsky (1):
>  rseq/selftests: s390: use trap4 for RSEQ_SIG
> 
> Mathieu Desnoyers (11):
>  rseq/selftests: x86: Work-around bogus gcc-8 optimisation
>  rseq/selftests: Add __rseq_exit_point_array section for debuggers
>  rseq/selftests: Introduce __rseq_cs_ptr_array, rename __rseq_table to
>    __rseq_cs
>  rseq/selftests: Use __rseq_handled symbol to coexist with glibc
>  rseq/selftests: s390: use jg instruction for jumps outside of the asm
>  rseq/selftests: x86: use ud1 instruction as RSEQ_SIG opcode
>  rseq/selftests: arm: use udf instruction for RSEQ_SIG
>  rseq/selftests: aarch64 code signature: handle big-endian environment
>  rseq/selftests: powerpc code signature: generate valid instructions
>  rseq/selftests: mips: use break instruction for RSEQ_SIG
>  rseq/selftests: add -no-integrated-as for clang
> 
> tools/testing/selftests/rseq/Makefile     |   8 +-
> tools/testing/selftests/rseq/rseq-arm.h   | 132 +++++++++++++--
> tools/testing/selftests/rseq/rseq-arm64.h |  74 ++++++++-
> tools/testing/selftests/rseq/rseq-mips.h  | 115 +++++++++++--
> tools/testing/selftests/rseq/rseq-ppc.h   |  90 +++++++++-
> tools/testing/selftests/rseq/rseq-s390.h  |  78 ++++++++-
> tools/testing/selftests/rseq/rseq-x86.h   | 264 +++++++++++++++++++++---------
> tools/testing/selftests/rseq/rseq.c       |  55 ++++++-
> tools/testing/selftests/rseq/rseq.h       |   1 +
> 9 files changed, 688 insertions(+), 129 deletions(-)
> 
> --
> 2.11.0

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com