On 7/18/2025 12:27 AM, Fuad Tabba wrote:
Introduce the new KVM capability KVM_CAP_GMEM_MMAP. This capability
signals to userspace that a KVM instance supports host userspace mapping
of guest_memfd-backed memory.
The availability of this capability is determined per architecture, and
its enablement for a specific guest_memfd instance is controlled by the
GUEST_MEMFD_FLAG_MMAP flag at creation time.
Update the KVM API documentation to detail the KVM_CAP_GMEM_MMAP
capability, the associated GUEST_MEMFD_FLAG_MMAP, and provide essential
information regarding support for mmap in guest_memfd.
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Gavin Shan <gshan@xxxxxxxxxx>
Reviewed-by: Shivank Garg <shivankg@xxxxxxx>
Signed-off-by: Fuad Tabba <tabba@xxxxxxxxxx>
Reviewed-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>
Though I have comments on some patches, the general functionality for
x86 seems to be work. I plan to do a POC with QEMU to test non-coco VM
with guest_memfd with mmap support as the memory backend.
