Re: [GIT PULL] VFIO updates for v6.17-rc1

[David Hildenbrand <david@redhat.com>]

On 05.08.25 14:38, Jason Gunthorpe wrote:
> On Tue, Aug 05, 2025 at 02:07:49PM +0200, David Hildenbrand wrote:
>> I don't see an easy way to guarantee that. E.g., populate_section_memmap
>> really just does a kvmalloc_node() and
>> __populate_section_memmap()->memmap_alloc() a memblock_alloc().
> 
> Well, it is really easy, if you do the kvmalloc_node and you get the
> single unwanted struct page value, then call it again and free the
> first one. The second call is guarenteed to not return the unwanted
> value because the first call has it allocated.

So you want to walk all existing sections to check that? :)

That's the kind of approach I would describe with the words Linus used.

-- 
Cheers,

David / dhildenb