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Re: [Qemu-devel] [RFC 0/1] Add BPF suuport to Qemu

From: Jason Wang
Subject: Re: [Qemu-devel] [RFC 0/1] Add BPF suuport to Qemu
Date: Wed, 20 Jun 2018 16:13:10 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0

On 2018年06月19日 21:21, Sameeh Jubran wrote:
From: Sameeh Jubran <address@hidden>

The Berkeley Packet Filter has been in the kernel for a while now and I
think it is time that it is introduced to Qemu. This patch is an
infrastructure for any future usage of the BPF in Qemu.

It is important to note that the tun driver had started supporting using

At first, instead of adding the syscall wrappers, I wanted to integrate libbpf
library which resides in the Linux source tree under tools/lib/bpf. It appears
to be that by default it compiles to x64 on x64 arch - which can't be
integrated into Qemu  - and my attempts to compile the 32 bit versions have
failed. What's more interesting is that the vendors don't provide this library
in any package, which makes this library a nasty dependency.

Please share your thoughts :)

I wonder, instead of a generic eBPF support, can we have a limited but sufficient eBPF suppor for TAP only (see dpdk tap driver)? E.g if we only do bytecode loading, there's no need for e.g map update helpers.


Sameeh Jubran (1):
   Add BPF support to qemu

  MAINTAINERS                     |   7 +
  bpf/Makefile.objs               |   1 +
  bpf/bpf_syscall.c               |  98 ++++++
  include/bpf/bpf_syscall.h       |  35 +++
  linux-headers/linux/bpf.h       | 673 ++++++++++++++++++++++++++++++++++++++++
  scripts/update-linux-headers.sh |   3 +-
  6 files changed, 816 insertions(+), 1 deletion(-)
  create mode 100644 bpf/Makefile.objs
  create mode 100644 bpf/bpf_syscall.c
  create mode 100644 include/bpf/bpf_syscall.h
  create mode 100644 linux-headers/linux/bpf.h

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