On 18.03.25 17:18, Fuad Tabba wrote:
Before transitioning a guest_memfd folio to unshared, thereby disallowing access by the host and allowing the hypervisor to transition its view of the guest page as private, we need to be sure that the host doesn't have any references to the folio. This patch introduces a new type for guest_memfd folios, which isn't activated in this series but is here as a placeholder and to facilitate the code in the subsequent patch series. This will be used in the future to register a callback that informs the guest_memfd subsystem when the last reference is dropped, therefore knowing that the host doesn't have any remaining references. This patch also introduces the configuration option, KVM_GMEM_SHARED_MEM, which toggles support for mapping guest_memfd shared memory at the host. Signed-off-by: Fuad Tabba <tabba@xxxxxxxxxx> Acked-by: Vlastimil Babka <vbabka@xxxxxxx> Acked-by: David Hildenbrand <david@xxxxxxxxxx> ---
Same with this patch for now. -- Cheers, David / dhildenb
