Re: [PATCH 0/5] eBPF RSS through QMP support.

[Andrew Melnichenko]

Hi all,

On Wed, May 3, 2023 at 11:22 AM Daniel P. Berrangé <berrange@redhat.com> wrote:
>
> On Mon, May 01, 2023 at 10:20:56AM +0300, Andrew Melnychenko wrote:
> > This series of patches provides the ability to retrieve eBPF program
> > through qmp, so management application may load bpf blob with proper 
> > capabilities.
> > Now, virtio-net devices can accept eBPF programs and maps through properties
> > as external file descriptors. Access to the eBPF map is direct through 
> > mmap()
> > call, so it should not require additional capabilities to bpf* calls.
> > eBPF file descriptors can be passed to QEMU from parent process or by unix
> > socket with sendfd() qmp command.
> >
> > Possible solution for libvirt may look like this: 
> > https://github.com/daynix/libvirt/tree/RSS_eBPF (WIP)
>
> Is that complete enough to be running guests ? If so, have you
> successfully tested with a QEMU running under qemu:///system
> as the qemu:qemu user, to prove it works without any extra
> capabilities being needed ?

Yeah, but still working on it. Overall, QEMU doesn't require
additional capabilities.
Map update through mmap doesn't require any.
Tested with qemu://system.
There is still an issue with cache for libvirt.

>
> With regards,
> Daniel
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>