[PATCH] swiotlb-xen: fix DMA_ATTR_NO_KERNEL_MAPPING on arm

[Stefano Stabellini]

On Fri, 29 Apr 2022, Boris Ostrovsky wrote:
> On 4/28/22 6:49 PM, Stefano Stabellini wrote:
> > On Thu, 28 Apr 2022, Boris Ostrovsky wrote:
> > > On 4/28/22 5:49 PM, Stefano Stabellini wrote:
> > > > On Thu, 28 Apr 2022, Christoph Hellwig wrote:
> > > > > On Tue, Apr 26, 2022 at 04:07:45PM -0700, Stefano Stabellini wrote:
> > > > > > > Reported-by: Rahul Singh <Rahul.Singh at arm.com>
> > > > > > > Signed-off-by: Christoph Hellwig <hch at lst.de>
> > > > > > Reviewed-by: Stefano Stabellini <sstabellini at kernel.org>
> > > > > Do you want to take this through the Xen tree or should I pick it up?
> > > > > Either way I'd love to see some testing on x86 as well.
> > > > I agree on the x86 testing. Juergen, Boris?
> > > > 
> > > > I'd say to take this patch via the Xen tree but Juergen has just sent a
> > > > Xen pull request to Linux last Saturday. Juergen do you plan to send
> > > > another one? Do you have something else lined up? If not, it might be
> > > > better to let Christoph pick it up.
> > > 
> > > We don't have anything pending.
> > > 
> > > 
> > > I can test it but at best tomorrow so not sure we can get this into rc5.
> > > Do
> > > you consider this an urgent fix or can we wait until 5.19? Because it's a
> > > bit
> > > too much IMO for rc6.
> > On one hand, Linux doesn't boot on a platform without this fix. On the
> > other hand, I totally see that this patch could introduce regressions on
> > x86 so I think it is fair that we are careful with it.
> > 
> >  From my point of view, it might be better to wait for 5.19 and mark it
> > as backport.
> 
> 
> No problems uncovered during testing.

Great! Christoph you can go ahead and pick it up in your tree if you are
up for it.