Re: [PATCH v3 1/1] iommu/sva: Invalidate KVA range on kernel TLB flush

[Matthew Wilcox <willy@infradead.org>]

On Thu, Aug 28, 2025 at 12:31:40PM -0700, Dave Hansen wrote:
> On 8/28/25 12:10, Jason Gunthorpe wrote:
> >> The biggest single chunk of code is defining ptdesc_*_kernel(). The rest
> >> of it is painfully simple.
> > Seems not great to be casting ptdesc to folio just to use
> > folio_set_referenced(), I'm pretty sure that is no the direction
> > things are going in..
> 
> Ideally, the ptdesc->__page_flags fields would have their own set of
> macros just like folios do, right? Alas, I was too lazy to go to the
> trouble of conjuring those up for this single bit.

There's a bunch of "Ideally" in ptdesc, but I'm equially too lazy to do
that before I've proven everything works great with slab and/or folios.
It'll have to be changed no matter which way we do it, so as long as
it's obvious where needs to be changed, it's fine.  I deem this
"good enough for now".