Re: [PATCH v3 00/23] vfio-user client

["Cédric Le Goater" <clg@redhat.com>]

John,

On 6/7/25 02:10, John Levon wrote:
> The series contains an implement of a vfio-user client in QEMU, along with a few
> more preparatory patches.
> 
> The vfio-user protocol allows for implementing (PCI) devices in another
> userspace process; SPDK is one example, which includes a virtual NVMe
> implementation.
> 
> The vfio-user framework consists of 3 parts:
>   1) The VFIO user protocol specification.
>   2) A client - the VFIO device in QEMU that encapsulates VFIO messages
>      and sends them to the server.
>   3) A server - a remote process that emulates a device.
> 
> This patchset implements parts 1 and 2.
> 
> It has been tested against libvfio-user test servers as well as SPDK.

Is libvfio-user a server-only library ? It seems a bit odd not to use it
on the client side. Anyhow,


We have now merged upstream all the prerequisite changes for vfio-user.
This gives us about 1 month to fix regressions and merge the model for
the vfio-user-pci device, its documentation and tests.


I *really* would prefer if we had functional tests although I don't how
complex it would be. At least an initial framework would be good to have.
More sophisticated scenarios, such as mappings and interrupts, can come
later.

Thanks,

C.