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From: Zong Li <zong.li@sifive.com>
To: "Patrick Stählin" <me@packi.ch>,
	"Masami Hiramatsu" <mhiramat@kernel.org>
Cc: Greentime Hu <greentime.hu@sifive.com>,
	linux-riscv <linux-riscv@lists.infradead.org>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Anders Roxell <anders.roxell@linaro.org>,
	Paul Walmsley <paul.walmsley@sifive.com>
Subject: Re: [RFC/RFT 2/2] RISC-V: kprobes/kretprobe support
Date: Tue, 31 Mar 2020 10:45:21 +0800	[thread overview]
Message-ID: <CANXhq0r5+BjsJ8jFtkWcm_1qPPQnLyZ5THNdPsxU568FNNa0XA@mail.gmail.com> (raw)
In-Reply-To: <CANXhq0peZCWZsh37zZVzoi7spSzTfz7v4H5AytiAENKJdWK_tA@mail.gmail.com>

On Thu, Dec 19, 2019 at 5:28 PM Zong Li <zong.li@sifive.com> wrote:
>
> On Wed, Dec 18, 2019 at 9:10 PM Patrick Stählin <me@packi.ch> wrote:
> >
> > Hi all
> >
> > On 18.12.19 10:14, Zong Li wrote:
> > > On Wed, Dec 18, 2019 at 5:09 PM Zong Li <zong.li@sifive.com> wrote:
> > >>
> > >> From: mhiramat@kernel.org (Masami Hiramatsu)
> > >>
> > >> On Wed, 14 Nov 2018 21:52:57 +0100
> > >> Patrick Staehlin <me@packi.ch> wrote:
> > >>
> > >>> Yeah, I think it's simpler.
> > >>>
> > >>> And I found that the kprobe_breakpoint_handler() was called without
> > >>> checking !user_mode(regs). In that case, you should add the check in
> > >>> front of kprobe_breakpoint_handler() call.
> > >>>
> > >>> Thank you,
> > >>
> > >> Hi all,
> > >>
> > >> Is there any update? I was wondering if this patch are keep going? If
> > >> not, I think I could pick it up to go head
> >
> > I am still working on it, albeit slowly, holiday season coming up here
> > in Switzerland may accelerate that a bit. All the feedback I got from
> > Masami has been implemented.
>
> As Masami's suggestion, I don't see stop_machine in your implementation [1],
> are there some concerns to use it on SMP?

Hi all,
I introduced the patching code framework. Maybe it is helpful for
self-modify code here. (Please see:
https://lkml.org/lkml/2020/3/9/679)
This patch series is reviewing, maybe we could apply the
implementation after it was merged.


>
> > Additionally I added instruction simulation for everything except memory
> > accesses. I am currently working on getting compressed instructions
> > decoded properly into regular instructions but that is very tedious work.
> > I guess I am two or three full days of work away from getting a RFC/RFT
> > v2 series ready I guess that will happen in early January.
>
> Thanks for the efforts.
>
> >
> > What I currently have is at [1], that is mostly untested as of now
> > (beware I will rebase/squash that branch regularly). What I could use
> > help with in the future (as in for v2), is somebody testing it on real
> > hardware, as I've never gotten any testing feedback on my original
> > patch-series (that would not have worked properly because of the lacking
> > cache-flush).
>
> I give some quick tests by using kprobe sanity test and simple LKM on
> Hifive Unleashed board,
> it seems to work normally. I could help to test your next version patch as well.
>
> >
> > [1] https://github.com/packi/linux/tree/kprobes-riscv
> >
> > Patrick


  reply	other threads:[~2020-03-31  2:45 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-13 19:58 [RFC/RFT 0/2] " Patrick Stählin
2018-11-13 19:58 ` Patrick Stählin
2018-11-13 19:58 ` [RFC/RFT 1/2] RISC-V: Implement ptrace regs and stack API Patrick Stählin
2018-11-13 19:58   ` Patrick Stählin
2019-11-21 22:34   ` Paul Walmsley
2018-11-13 19:58 ` [RFC/RFT 2/2] RISC-V: kprobes/kretprobe support Patrick Stählin
2018-11-13 19:58   ` Patrick Stählin
2018-11-14  8:37   ` Masami Hiramatsu
2018-11-14  8:37     ` Masami Hiramatsu
2018-11-14 15:49     ` Masami Hiramatsu
2018-11-14 15:49       ` Masami Hiramatsu
2018-11-14 21:10       ` Patrick Staehlin
2018-11-14 21:10         ` Patrick Staehlin
2018-11-15  7:50         ` Masami Hiramatsu
2018-11-15  7:50           ` Masami Hiramatsu
2019-12-20 11:14         ` Paul Walmsley
2019-12-20 22:46           ` Paul Walmsley
2018-11-14 20:52     ` Patrick Staehlin
2018-11-14 20:52       ` Patrick Staehlin
2018-11-15  8:41       ` Masami Hiramatsu
2018-11-15  8:41         ` Masami Hiramatsu
     [not found]         ` <CANXhq0qWwKRrz80Q3LSeQu-cH19otCF1my6dDGDxH0Q5j1RYYw@mail.gmail.com>
     [not found]           ` <9cdd84b5-6c81-9bfa-5d35-6645f542f71e@packi.ch>
2019-12-19  9:28             ` Zong Li
2020-03-31  2:45               ` Zong Li [this message]
2020-06-12  5:57                 ` David Abdurachmanov
2020-06-17 12:58                   ` Guo Ren
2020-06-17 14:54                     ` Masami Hiramatsu
2020-06-18 16:14                       ` Guo Ren
2020-07-05 14:57                       ` Guo Ren

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