Re: [PATCH] mm/x86/pat: Only untrack the pfn range if unmap region

David Hildenbrand
2024-07-17T16:32:11Z

On 17.07.24 18:30, Peter Xu wrote:
> On Wed, Jul 17, 2024 at 04:17:12PM +0200, David Hildenbrand wrote:
>> I'd be curious how a previous truncation on a file can tear down a PFNMAP
>> mapping -- and if there are simple ways to forbid that (if possible).
>
> Unfortunately, forbiding it may not work for vfio, as vfio would like to
> allow none (or partial) mapping on the bars.. at least so far that's the
> plan.

I think vfio should handle that memtype reservation manually, as you
proposed. So that shouldn't block that IIUC.

--
Cheers,

David / dhildenb