Re: [PATCH v1 00/22] vfio: Adopt iommufd

[Cédric Le Goater]

On 9/18/23 13:51, Jason Gunthorpe wrote:
> On Fri, Sep 15, 2023 at 02:42:48PM +0200, Cédric Le Goater wrote:
> > On 8/30/23 12:37, Zhenzhong Duan wrote:
> > > Hi All,
> > >
> > > As the kernel side iommufd cdev and hot reset feature have been queued,
> > > also hwpt alloc has been added in Jason's for_next branch [1], I'd like
> > > to update a new version matching kernel side update and with rfc flag
> > > removed. Qemu code can be found at [2], look forward more comments!
> >
> > FYI, I have started cleaning up the VFIO support in QEMU PPC. First
> > is the removal of nvlink2, which was dropped from the kernel 2.5 years
> > ago. Next is probably removal of all the PPC bits in VFIO. Code is
> > bitrotting and AFAICT VFIO has been broken on these platforms since
> > 5.18 or so.
>
> It was fixed since then - at least one company (not IBM) still cares
> about vfio on ppc, though I think it is for a DPDK use case not VFIO.

Indeed.
I just checked on a POWER9 box running a debian sid (6.4) and device
assignment of a simple NIC (e1000e) in a ubuntu 23.04 guest worked
correctly. Using a 6.6-rc1 on the host worked also. One improvement
would be to reflect in the Kconfig files that CONFIG_IOMMUFD is not
supported on PPC so that it can not be selected.

Thanks,

C.