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

[Jason Wang]

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
> BPF programs through ioctls (TUNSETSTEERINGEBPF and TUNSETFILTEREBPF).
>
> 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.

Thanks

> 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