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

["Michael S. Tsirkin" <mst@redhat.com>]

On Fri, Jul 24, 2026 at 07:04:52PM +0100, Matthew Wilcox wrote:
> 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.


Last time I tried to fix hwpoison, i wasted untold hours on it, only
to decide that it was always racy and does not seem to be worth fixing.
At least yours isn't a race.

-- 
MST