Re: [PATCH 00/11] mlx5 support for VFIO self test

Jason Gunthorpe
2026-05-02T13:40:30Z

On Fri, May 01, 2026 at 10:31:49PM -0600, Alex Williamson wrote:
> On Thu, Apr 30, 2026, at 6:08 PM, Jason Gunthorpe wrote:
> > Add an mlx5 driver to VFIO self test. This is largely a remix of the
> > existing VFIO mlx5 driver in rdma-core. It uses an RDMA loopback QP
> > to issue RDMA WRITE operations which effectively perform memory
> > copies using DMA. Since mlx5 has a stable programming ABI this
> > should work on devices from CX5 to current HW. The device FW must
> > support the QP loopback configuration.
>
> Does the PCI ID table in the series need some pruning then? It
> includes CX4.

Maybe.. I don't actually know that it doesn't work on CX4 and before,
I only was able to test as far back as CX5. I'm thinking to leave it
and if someone does try it and it doesn't work then remove it.

Jason