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From: Luke Nelson <lukenels@cs.washington.edu>
To: Daniel Borkmann <daniel@iogearbox.net>
Cc: "Björn Töpel" <bjorn.topel@gmail.com>,
	"Alexei Starovoitov" <ast@kernel.org>,
	Netdev <netdev@vger.kernel.org>,
	linux-riscv@lists.infradead.org, bpf <bpf@vger.kernel.org>,
	"Xi Wang" <xi.wang@gmail.com>
Subject: Re: [PATCH bpf-next 2/8] riscv, bpf: add support for far branching
Date: Mon, 9 Dec 2019 23:02:53 -0800	[thread overview]
Message-ID: <CADasFoCZc7Lt=puc82x7PBSvuOG_dBwVgasYGJ4M3RFDG=qR3A@mail.gmail.com> (raw)
In-Reply-To: <2d5d1f2d-d4ab-2449-37c6-e5b319a778d6@iogearbox.net>

On Mon, Dec 9, 2019 at 1:27 PM Daniel Borkmann <daniel@iogearbox.net> wrote:
>
> This is awesome work! Did you also check for other architectures aside
> from riscv and x86-32, e.g. x86-64 or arm64?

We haven't tried on x86-64 or arm64 yet, but we plan to in the
future and are looking at ways to minimize the effort required to
port verification to new architectures.

> It would be great if we could add such verification tool under tools/bpf/
> which would then take the in-tree JIT-code as-is for its analysis and
> potentially even trigger a run out of BPF selftests. Any thoughts whether
> such path would be feasible wrt serval?

Right now the verification requires manual translation of the JIT
implementation in C to Rosette for verification, which makes it
difficult to integrate into existing tests. Were currently working
on automating this process to be able to verify the C implementation
directly. If this works out, it'd be awesome to integrate into the
selftests in some way. Will keep you posted.

Thanks,

Luke

  reply	other threads:[~2019-12-10  7:03 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-09 17:31 [PATCH bpf-next 0/8] riscv: BPF JIT fix, optimizations and far jumps support Björn Töpel
2019-12-09 17:31 ` [PATCH bpf-next 1/8] riscv, bpf: fix broken BPF tail calls Björn Töpel
2019-12-09 17:31 ` [PATCH bpf-next 2/8] riscv, bpf: add support for far branching Björn Töpel
2019-12-09 21:08   ` Luke Nelson
2019-12-09 21:27     ` Daniel Borkmann
2019-12-10  7:02       ` Luke Nelson [this message]
2019-12-10  5:32     ` Björn Töpel
2019-12-10  5:31   ` Björn Töpel
2019-12-09 17:31 ` [PATCH bpf-next 3/8] riscv, bpf: add support for far jumps and exits Björn Töpel
2019-12-09 21:15   ` Luke Nelson
2019-12-09 17:31 ` [PATCH bpf-next 4/8] riscv, bpf: optimize BPF tail calls Björn Töpel
2019-12-09 17:31 ` [PATCH bpf-next 5/8] riscv, bpf: provide RISC-V specific JIT image alloc/free Björn Töpel
2019-12-09 17:31 ` [PATCH bpf-next 6/8] riscv, bpf: optimize calls Björn Töpel
2019-12-09 17:31 ` [PATCH bpf-next 7/8] riscv, bpf: add missing uapi header for BPF_PROG_TYPE_PERF_EVENT programs Björn Töpel
2019-12-09 17:31 ` [PATCH bpf-next 8/8] riscv, perf: add arch specific perf_arch_bpf_user_pt_regs Björn Töpel

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