Re: [PATCH v8 14/18] mm: memfd_luo: allow preserving memfd

[Jason Gunthorpe]

On Tue, Nov 25, 2025 at 11:58:44AM -0500, Pasha Tatashin wrote:
> From: Pratyush Yadav <ptyadav@xxxxxxxxx>
> 
> The ability to preserve a memfd allows userspace to use KHO and LUO to
> transfer its memory contents to the next kernel. This is useful in many
> ways. For one, it can be used with IOMMUFD as the backing store for
> IOMMU page tables. Preserving IOMMUFD is essential for performing a
> hypervisor live update with passthrough devices. memfd support provides
> the first building block for making that possible.

I would lead with the use of memfd to back the guest memory pages for
use with KVM :)

Jason