vmm, virtio-devices: mem: Don't use MADV_DONTNEED on hugepages

This commit introduces a new information to the VirtioMemZone structure
in order to know if the memory zone is backed by hugepages.

Based on this new information, the virtio-mem device is now able to
determine if madvise(MADV_DONTNEED) should be performed or not. The
madvise documentation specifies that MADV_DONTNEED advice will fail if
the memory range has been allocated with some hugepages.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Signed-off-by: Hui Zhu <teawater@antfin.com>

vmm/src/device_manager.rs

@@ -2347,6 +2347,7 @@ impl DeviceManager {
                         self.seccomp_action.clone(),
                         node_id,
                         virtio_mem_zone.hotplugged_size(),
+                        virtio_mem_zone.hugepages(),
                     )
                     .map_err(DeviceManagerError::CreateVirtioMem)?,
                 ));