netdev - Re: [PATCH bpf-next,v3] riscv, bpf: Add BPF exception tables

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Message-Id: <163537620786.14362.5033693418821355895.git-patchwork-notify@kernel.org>
Date:   Wed, 27 Oct 2021 23:10:07 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     tongtiangen <tongtiangen@...wei.com>
Cc:     paul.walmsley@...ive.com, palmer@...belt.com,
        palmerdabbelt@...gle.com, aou@...s.berkeley.edu, bjorn@...nel.org,
        luke.r.nels@...il.com, xi.wang@...il.com, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, kafai@...com,
        songliubraving@...com, yhs@...com, john.fastabend@...il.com,
        kpsingh@...nel.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH bpf-next,v3] riscv, bpf: Add BPF exception tables

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Daniel Borkmann <daniel@...earbox.net>:

On Wed, 27 Oct 2021 11:18:22 +0000 you wrote:
> When a tracing BPF program attempts to read memory without using the
> bpf_probe_read() helper, the verifier marks the load instruction with
> the BPF_PROBE_MEM flag. Since the riscv JIT does not currently recognize
> this flag it falls back to the interpreter.
> 
> Add support for BPF_PROBE_MEM, by appending an exception table to the
> BPF program. If the load instruction causes a data abort, the fixup
> infrastructure finds the exception table and fixes up the fault, by
> clearing the destination register and jumping over the faulting
> instruction.
> 
> [...]

Here is the summary with links:
  - [bpf-next,v3] riscv, bpf: Add BPF exception tables
    https://git.kernel.org/bpf/bpf-next/c/252c765bd764

You are awesome, thank you!
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