Date:   Tue, 18 Oct 2022 15:22:06 +0100
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     binglei wang <l3b2w1@...il.com>
CC:     Conor Dooley <conor@...nel.org>, <paul.walmsley@...ive.com>,
        <palmer@...belt.com>, <aou@...s.berkeley.edu>,
        <naveen.n.rao@...ux.ibm.com>, <anil.s.keshavamurthy@...el.com>,
        <davem@...emloft.net>, <mhiramat@...nel.org>,
        <linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8] rethook: add riscv rethook implementation

On Tue, Oct 18, 2022 at 10:08:55PM +0800, binglei wang wrote:
> Hi Conor:
> Thank you for your help to check the merging process for this patch.
> 
> > Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
> > -- links below jump to the message on this page --
> >      [not found] <20220930081357.651914-1-l3b2w1@...il.com>
> I have no idea what this means, I guess maybe the way i sended the
> patch was not right.
> 
> I found the patch on the lore in this url, is this helpful ?
> https://lore.kernel.org/lkml/20221002181035.490ad0155d741e39faa29716@kernel.org/

Hmm, looks like your patch made it to lkml itself but got rejected by
linux-riscv which is hosted by infradead. It's missing here:
https://lore.kernel.org/linux-riscv/CAJ3C4Kwj0yYS5JCPw=g0X9qiQhw04iKy_cTjc0x8iWdy0ay7bg@mail.gmail.com/T/#t

> 
> > I'm not really sure what's happened there.. I can only see your v1 and
> > your v4 on lore/patchwork.
> I find all my commits from v1 to v8 in this addr
> https://lore.kernel.org/lkml/?q=l3b2w1
> 
> Should I resend the patch as a last resort ?

Eh, I guess you could try (and CC patches@...ts.linux.dev). I'm not sure
if that'll help at all though.. At worst, if that doesn't work I could
possibly send the patches for you. Or if you think you may end up doing
more upstream work you could always apply for an @linux.dev account?
See https://korg.docs.kernel.org/linuxdev.html for more information on
that.

> 
> Binglei Wang
> Best wishes.
> 
> Conor Dooley <conor@...nel.org> 于2022年10月17日周一 22:58写道：
> >
> > On Mon, Oct 17, 2022 at 10:31:28PM +0800, binglei wang wrote:
> > > Hi Conor,
> > > could you please help me to push forward merging process of this patch
> > > into the 6.1 ?  Thank you!
> >
> > Hey Binglei,
> > Unfortunately it is too late for v6.1 (the merge window closed on
> > Sunday, Palmer sent his second PR on Friday) but I don't see why this
> > should not be picked for v6.2. I tried last week & again just now to
> > check the status of this patch on patchwork but I cannot find it there.
> > Similarly, the patch does not appear on lore:
> > https://lore.kernel.org/linux-riscv/CAJ3C4KzyAR7dKYFBKHzFEXr-dzr-JMGRFVx+dybMhRPy0uHUgA@mail.gmail.com/T/#t
> > Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
> > -- links below jump to the message on this page --
> >      [not found] <20220930081357.651914-1-l3b2w1@...il.com>
> > 2022-10-02  9:10 ` [PATCH v8] rethook: add riscv rethook implementation Masami Hiramatsu
> > 2022-10-02 16:39 ` Conor Dooley
> > 2022-10-17 14:31   ` binglei wang
> >
> > I'm not really sure what's happened there.. I can only see your v1 and
> > your v4 on lore/patchwork. Maybe take a look if you changed anything
> > between versions & try resending as v9?
> >
> > HTH,
> > Conor.
> >
> > >
> > > Binglei Wang
> > > Best wishes.
> > >
> > >
> > > On 2022-10-03 00:39, Conor Dooley wrote:
> > > > Hey Binglei,
> > > > I am not qualified to give you an actual R-b on this patch, but I see
> > > > you did get one from Masami who very much is!
> > > >
> > > > That said, the patch looks a lot better (and much simpler!) now. Thanks
> > > > for sticking with it despite the initial issues with your email setup
> > > > and the submission process.
> > > >
> > > > Thanks,
> > > > Conor.
> > > >
> > > > On Fri, Sep 30, 2022 at 04:13:57PM +0800, Binglei Wang wrote:
> > > >> From: Binglei Wang <l3b2w1@...il.com>
> > > >>
> > > >> Implement the kretprobes on riscv arch by using rethook machenism
> > > >> which abstracts general kretprobe info into a struct rethook_node
> > > >> to be embedded in the struct kretprobe_instance.
> > > >>
> > > >> Signed-off-by: Binglei Wang <l3b2w1@...il.com>
> > > >> ---
> > > >>
> > > >> Notes:
> > > >>      v8: Add the omitted rethook.h
> > > >>      v7: Add the changelog.
> > > >>      v6: Remove the kretprobes trampoline.
> > > >>      v5: Trt to fix robot compiling error and warnings.
> > > >>      v4: Add patch version number.
> > > >>      v3: Trt to fix robot compiling error and warnings.
> > > >>      v2: Add comit log to explain reasons behind changes.
> > > >>          Use my personal email instead of work email
> > > >>              to avoid the attachments of company informaton.
> > > >>          Make the kprobes_trampoline.S code to be shared.
> > > >>      v1: Add riscv rethook implementation.
> > > >>
> > > >>   arch/riscv/Kconfig                            |  1 +
> > > >>   arch/riscv/include/asm/kprobes.h              |  2 --
> > > >>   arch/riscv/kernel/probes/Makefile             |  2 +-
> > > >>   arch/riscv/kernel/probes/kprobes.c            | 13 ---------
> > > >>   arch/riscv/kernel/probes/rethook.c            | 27 +++++++++++++++++++
> > > >>   arch/riscv/kernel/probes/rethook.h            |  8 ++++++
> > > >>   ...obes_trampoline.S => rethook_trampoline.S} |  6 ++---
> > > >>   7 files changed, 40 insertions(+), 19 deletions(-)
> > > >>   create mode 100644 arch/riscv/kernel/probes/rethook.c
> > > >>   create mode 100644 arch/riscv/kernel/probes/rethook.h
> > > >>   rename arch/riscv/kernel/probes/{kprobes_trampoline.S => rethook_trampoline.S} (94%)
> > > >>
> > > >> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> > > >> index 59d18881f..bfb66cdc5 100644
> > > >> --- a/arch/riscv/Kconfig
> > > >> +++ b/arch/riscv/Kconfig
> > > >> @@ -97,6 +97,7 @@ config RISCV
> > > >>      select HAVE_KPROBES if !XIP_KERNEL
> > > >>      select HAVE_KPROBES_ON_FTRACE if !XIP_KERNEL
> > > >>      select HAVE_KRETPROBES if !XIP_KERNEL
> > > >> +    select HAVE_RETHOOK if !XIP_KERNEL
> > > >>      select HAVE_MOVE_PMD
> > > >>      select HAVE_MOVE_PUD
> > > >>      select HAVE_PCI
> > > >> diff --git a/arch/riscv/include/asm/kprobes.h b/arch/riscv/include/asm/kprobes.h
> > > >> index 217ef89f2..e7882ccb0 100644
> > > >> --- a/arch/riscv/include/asm/kprobes.h
> > > >> +++ b/arch/riscv/include/asm/kprobes.h
> > > >> @@ -40,8 +40,6 @@ void arch_remove_kprobe(struct kprobe *p);
> > > >>   int kprobe_fault_handler(struct pt_regs *regs, unsigned int trapnr);
> > > >>   bool kprobe_breakpoint_handler(struct pt_regs *regs);
> > > >>   bool kprobe_single_step_handler(struct pt_regs *regs);
> > > >> -void __kretprobe_trampoline(void);
> > > >> -void __kprobes *trampoline_probe_handler(struct pt_regs *regs);
> > > >>
> > > >>   #endif /* CONFIG_KPROBES */
> > > >>   #endif /* _ASM_RISCV_KPROBES_H */
> > > >> diff --git a/arch/riscv/kernel/probes/Makefile b/arch/riscv/kernel/probes/Makefile
> > > >> index 7f0840dcc..c40139e9c 100644
> > > >> --- a/arch/riscv/kernel/probes/Makefile
> > > >> +++ b/arch/riscv/kernel/probes/Makefile
> > > >> @@ -1,6 +1,6 @@
> > > >>   # SPDX-License-Identifier: GPL-2.0
> > > >>   obj-$(CONFIG_KPROBES)              += kprobes.o decode-insn.o simulate-insn.o
> > > >> -obj-$(CONFIG_KPROBES)               += kprobes_trampoline.o
> > > >> +obj-$(CONFIG_RETHOOK)               += rethook.o rethook_trampoline.o
> > > >>   obj-$(CONFIG_KPROBES_ON_FTRACE)    += ftrace.o
> > > >>   obj-$(CONFIG_UPROBES)              += uprobes.o decode-insn.o simulate-insn.o
> > > >>   CFLAGS_REMOVE_simulate-insn.o = $(CC_FLAGS_FTRACE)
> > > >> diff --git a/arch/riscv/kernel/probes/kprobes.c b/arch/riscv/kernel/probes/kprobes.c
> > > >> index e6e950b7c..f21592d20 100644
> > > >> --- a/arch/riscv/kernel/probes/kprobes.c
> > > >> +++ b/arch/riscv/kernel/probes/kprobes.c
> > > >> @@ -345,19 +345,6 @@ int __init arch_populate_kprobe_blacklist(void)
> > > >>      return ret;
> > > >>   }
> > > >>
> > > >> -void __kprobes __used *trampoline_probe_handler(struct pt_regs *regs)
> > > >> -{
> > > >> -    return (void *)kretprobe_trampoline_handler(regs, NULL);
> > > >> -}
> > > >> -
> > > >> -void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
> > > >> -                                  struct pt_regs *regs)
> > > >> -{
> > > >> -    ri->ret_addr = (kprobe_opcode_t *)regs->ra;
> > > >> -    ri->fp = NULL;
> > > >> -    regs->ra = (unsigned long) &__kretprobe_trampoline;
> > > >> -}
> > > >> -
> > > >>   int __kprobes arch_trampoline_kprobe(struct kprobe *p)
> > > >>   {
> > > >>      return 0;
> > > >> diff --git a/arch/riscv/kernel/probes/rethook.c b/arch/riscv/kernel/probes/rethook.c
> > > >> new file mode 100644
> > > >> index 000000000..cbd0da059
> > > >> --- /dev/null
> > > >> +++ b/arch/riscv/kernel/probes/rethook.c
> > > >> @@ -0,0 +1,27 @@
> > > >> +// SPDX-License-Identifier: GPL-2.0-only
> > > >> +/*
> > > >> + * Generic return hook for riscv.
> > > >> + */
> > > >> +
> > > >> +#include <linux/kprobes.h>
> > > >> +#include <linux/rethook.h>
> > > >> +#include "rethook.h"
> > > >> +
> > > >> +/* This is called from arch_rethook_trampoline() */
> > > >> +unsigned long __used arch_rethook_trampoline_callback(struct pt_regs *regs)
> > > >> +{
> > > >> +    return rethook_trampoline_handler(regs, regs->s0);
> > > >> +}
> > > >> +NOKPROBE_SYMBOL(arch_rethook_trampoline_callback);
> > > >> +
> > > >> +
> > > >> +void arch_rethook_prepare(struct rethook_node *rhn, struct pt_regs *regs, bool mcount)
> > > >> +{
> > > >> +    rhn->ret_addr = regs->ra;
> > > >> +    rhn->frame = regs->s0;
> > > >> +
> > > >> +    /* replace return addr with trampoline */
> > > >> +    regs->ra = (unsigned long)arch_rethook_trampoline;
> > > >> +}
> > > >> +NOKPROBE_SYMBOL(arch_rethook_prepare);
> > > >> +
> > > >> diff --git a/arch/riscv/kernel/probes/rethook.h b/arch/riscv/kernel/probes/rethook.h
> > > >> new file mode 100644
> > > >> index 000000000..cc573d701
> > > >> --- /dev/null
> > > >> +++ b/arch/riscv/kernel/probes/rethook.h
> > > >> @@ -0,0 +1,8 @@
> > > >> +// SPDX-License-Identifier: GPL-2.0-only
> > > >> +#ifndef __RISCV_RETHOOK_H
> > > >> +#define __RISCV_RETHOOK_H
> > > >> +
> > > >> +unsigned long arch_rethook_trampoline_callback(struct pt_regs *regs);
> > > >> +void arch_rethook_prepare(struct rethook_node *rhn, struct pt_regs *regs, bool mcount);
> > > >> +
> > > >> +#endif
> > > >> diff --git a/arch/riscv/kernel/probes/kprobes_trampoline.S b/arch/riscv/kernel/probes/rethook_trampoline.S
> > > >> similarity index 94%
> > > >> rename from arch/riscv/kernel/probes/kprobes_trampoline.S
> > > >> rename to arch/riscv/kernel/probes/rethook_trampoline.S
> > > >> index 7bdb09ded..21bac92a1 100644
> > > >> --- a/arch/riscv/kernel/probes/kprobes_trampoline.S
> > > >> +++ b/arch/riscv/kernel/probes/rethook_trampoline.S
> > > >> @@ -75,13 +75,13 @@
> > > >>      REG_L x31, PT_T6(sp)
> > > >>      .endm
> > > >>
> > > >> -ENTRY(__kretprobe_trampoline)
> > > >> +ENTRY(arch_rethook_trampoline)
> > > >>      addi sp, sp, -(PT_SIZE_ON_STACK)
> > > >>      save_all_base_regs
> > > >>
> > > >>      move a0, sp /* pt_regs */
> > > >>
> > > >> -    call trampoline_probe_handler
> > > >> +    call arch_rethook_trampoline_callback
> > > >>
> > > >>      /* use the result as the return-address */
> > > >>      move ra, a0
> > > >> @@ -90,4 +90,4 @@ ENTRY(__kretprobe_trampoline)
> > > >>      addi sp, sp, PT_SIZE_ON_STACK
> > > >>
> > > >>      ret
> > > >> -ENDPROC(__kretprobe_trampoline)
> > > >> +ENDPROC(arch_rethook_trampoline)
> > > >> --
> > > >> 2.27.0
> > > >>
> > >
> > > _______________________________________________
> > > linux-riscv mailing list
> > > linux-riscv@...ts.infradead.org
> > > http://lists.infradead.org/mailman/listinfo/linux-riscv
> > >

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