Re: [PATCH v4 05/14] guest_memfd: Use folio_has_hwpoisoned_page()

[Matthew Wilcox <willy@infradead.org>]

On Fri, Jul 24, 2026 at 08:16:25AM -0700, Sean Christopherson wrote:
> Heh, you don't want to sign up for a week or two of onion peeling?

Oh, you have no idea!

Here's my onion so far ...

1. I want to simplify filemap_fault()
2. That requires changing all the architecture fault handlers
3. So let's push some of that down to the MM with a new wrapper around
   handle_mm_fault()
4. This would be easier if we could hoist the creation of struct
   vm_fault from __handle_mm_fault() to handle_mm_fault()
5. Which would be possible if Jane's series to fix hugetlb use of pgoff
   had landed
6. Oh, hang on, handling hwpoison on hugetlb is actually broken in a
   few different ways (some pointed out by Sashiko, some I noticed
   myself)

I honestly thought I was just going to rearrange Jane's patch series
a bit and resubmit it, but fixing the hugetlb hwpoison handling has
consumed me for the past couple of weeks.