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

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Date:   Mon, 4 Mar 2019 10:07:56 +0000
From:   Sudeep Holla <sudeep.holla@....com>
To:     Andy Lutomirski <luto@...nel.org>
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>,
        Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 3/6] x86: clean up _TIF_SYSCALL_EMU handling using
 ptrace_syscall_enter hook

On Sat, Mar 02, 2019 at 05:11:40PM -0800, Andy Lutomirski wrote:
> 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?
>

I will ensure you are cc-ed on the whole threads, sorry for missing.
I remember seeing some selftests, but I haven't run them yet.

--
Regards,
Sudeep