linux-kernel - Re: [RFC v1 0/8] vhost-vdpa: add support for iommufd

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Message-ID: <20231107141237.GO4488@nvidia.com>
Date:   Tue, 7 Nov 2023 10:12:37 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Cindy Lu <lulu@...hat.com>, jasowang@...hat.com,
        yi.l.liu@...el.com, linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [RFC v1 0/8] vhost-vdpa: add support for iommufd

On Tue, Nov 07, 2023 at 08:28:32AM -0500, Michael S. Tsirkin wrote:
> On Tue, Nov 07, 2023 at 08:49:02AM -0400, Jason Gunthorpe wrote:
> > On Tue, Nov 07, 2023 at 02:30:34AM -0500, Michael S. Tsirkin wrote:
> > > On Sat, Nov 04, 2023 at 01:16:33AM +0800, Cindy Lu wrote:
> > > > 
> > > > Hi All
> > > > This code provides the iommufd support for vdpa device
> > > > This code fixes the bugs from the last version and also add the asid support. rebase on kernel
> > > > v6,6-rc3
> > > > Test passed in the physical device (vp_vdpa), but  there are still some problems in the emulated device (vdpa_sim_net), 
> > > 
> > > What kind of problems? Understanding that will make it easier
> > > to figure out whether this is worth reviewing.
> > 
> > IMHO, this patch series needs to spend more time internally to Red Hat
> > before it is presented to the community. It is too far away from
> > something worth reviewing at this point.
> > 
> > Jason
> 
> I am always trying to convince people to post RFCs early
> instead of working for months behind closed doors only
> to be told to rewrite everything in Rust.

The community has a limited review bandwidth, things should meet a
minimum standard before there is an expectation that other people
should review it on the list.

> Why does it have to be internal to a specific company?
> I see Yi Liu from Intel is helping Cindy get it into shape
> and that's classic open source ethos.

Big company's should take the responsibility to train and provide
skill development for their own staff.

> I know some subsystems ignore the RFC tag but I didn't realize
> iommu is one of these. Is that really true?

At least I've looked at this twice now and been disappointed. Neither
have been a well thought out RFC, this is a brain dump of unfinished
work.

Jason