RE: [PATCH v4 08/17] iommufd: Always setup MSI and anforce cc on kernel-managed domains

[Tian, Kevin]

> From: Nicolin Chen <nicolinc@xxxxxxxxxx>
> Sent: Monday, October 23, 2023 8:18 AM
> 
> On Sat, Oct 21, 2023 at 01:38:04PM -0300, Jason Gunthorpe wrote:
> > On Fri, Oct 20, 2023 at 11:59:13AM -0700, Nicolin Chen wrote:
> > > On Fri, Oct 20, 2023 at 10:55:01AM -0300, Jason Gunthorpe wrote:
> > > > On Fri, Oct 20, 2023 at 02:43:58AM +0000, Tian, Kevin wrote:
> > > >
> > > > > But the user shouldn't assume such explicit consistency since it's not
> > > > > defined in our uAPI. All we defined is that the attaching may
> > > > > fail due to incompatibility for whatever reason then the user can
> > > > > always try creating a new hwpt for the to-be-attached device. From
> > > > > this regard I don't see providing consistency of result is
> > > > > necessary. 😊
> > > >
> > > > Anyhow, OK, lets add a comment summarizing your points and remove
> the
> > > > cc upgrade at attach time (sorry Nicolin/Yi!)
> > >
> > > Ack. I will send a small removal series. I assume it should CC
> > > stable tree also?
> >
> > No, it seems more like tidying that fixing a functional issue, do I
> > misunderstand?
> 
> Hmm. Maybe the misunderstanding is mine -- Kevin was asking if
> it was already a bug and you answered yes:
> https://lore.kernel.org/linux-iommu/20231016115736.GP3952@xxxxxxxxxx/
> 

currently intel-iommu driver already rejects 1) enforcing CC on
a domain which is already attached to non-CC device and
2) attaching a non-CC device to a domain which has enforce_cc.

so there is no explorable bug to fix in stable tree.

Just logically intel-iommu driver doesn't support enforcing Cc
on a domain which is capable of enforce-cc and already has
valid mappings. Then it should add proper check to prevent
it from being attempted by future usages.