linux-kernel - Re: [PATCH 3/6] x86: clean up _TIF_SYSCALL_EMU handling using ptrace_syscall

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Date:   Sat, 2 Mar 2019 17:11:40 -0800
From:   Andy Lutomirski <luto@...nel.org>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     X86 ML <x86@...nel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Oleg Nesterov <oleg@...hat.com>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Richard Weinberger <richard@....at>,
        Jeff Dike <jdike@...toit.com>,
        Steve Capper <Steve.Capper@....com>,
        Haibo Xu <haibo.xu@....com>, Bin Lu <bin.lu@....com>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 3/6] x86: clean up _TIF_SYSCALL_EMU handling using
 ptrace_syscall_enter hook

On Thu, Feb 28, 2019 at 10:32 AM Sudeep Holla <sudeep.holla@....com> wrote:
>
> Now that we have a new hook ptrace_syscall_enter that can be called from
> syscall entry code and it handles PTRACE_SYSEMU in generic code, we
> can do some cleanup using the same in syscall_trace_enter.
>
> Further the extra logic to find single stepping PTRACE_SYSEMU_SINGLESTEP
> in syscall_slow_exit_work seems unnecessary. Let's remove the same.

I wasn't cc'd on the whole series, so I can't easily review this.  Do
you have a test case to make sure that emulation still works?  Are
there adequate tests in tools/testing/selftests/x86?  Do they still
pass after this patch?

--Andy