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Re: libvfio-user library in QEMU

From: Stefan Hajnoczi
Subject: Re: libvfio-user library in QEMU
Date: Mon, 15 Feb 2021 10:54:07 +0000

On Fri, Feb 12, 2021 at 12:08:11PM +0000, Jag Raman wrote:
> If we have to use libvfio-user library in QEMU, could we link the library 
> with the QEMU binary based on some config options?

Yes, meson_options.txt can be used.

> Secondly, the remote process in multi-process QEMU uses the same QEMU binary 
> for the remote process as well. Is this OK with libvfio-user, to start with? 
> Or do you think a separate binary is preferred for the remote process?

For now the extra library dependency doesn't seem like a big problem.

The long term question is how to build with vfio-user device backends:

1. Single-device binaries. For example "make qemu-vfio-user-e1000" would
   build a vfio-user-e1000 binary from hw/net/e1000.c.

2. Multi-device binaries. For example "make qemu-vfio-user-backend"
   would build a vfio-user-backend binary with certain devices enabled.
   The set of devices could be specified via Kconfig or maybe on the
   command-line E1000=y VIRTIO_NET_PCI=y.

Build system support for this should minimize duplication with
monolithic QEMU's meson and Kconfig scripts.

It would also be great to avoid boilerplate. It should not be necessary
to write a lot of code to build a new device type as a vfio-user device

> From previous discussions, I recall that libvfio-user would be git submodule 
> in QEMU repo. Is this still the preferred approach?

Yes, I haven't heard anything else since that discussion so I think the
plan is to use a git submodule.

Maybe later when the libvfio-user interface is stable and it's shipped
as a package by distributions the submodule will be replaced by a
traditional external library dependency.


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