Method add_ram_region

vmm/src/memory_manager.rs:2158–2204

(
        &mut self,
        start_addr: GuestAddress,
        size: usize,
    )

    }

    pub fn add_ram_region(
        &mut self,
        start_addr: GuestAddress,
        size: usize,
    ) -> Result<Arc<GuestRegionMmap>, Error> {
        // Allocate memory for the region
        let region = MemoryManager::create_ram_region(
            &None,
            0,
            start_addr,
            size,
            self.prefault,
            self.shared,
            self.hugepages,
            self.hugepage_size,
            None,
            None,
            self.thp,
        )?;

        // Map it into the guest
        // SAFETY: guaranteed by GuestMmapRegion invariants
        let slot = unsafe {
            self.create_userspace_mapping(
                region.start_addr().0,
                region.len().try_into().unwrap(),
                region.as_ptr(),
                self.memory_zones
                    .get(DEFAULT_MEMORY_ZONE)
                    .map_or(self.mergeable, |z| z.mergeable),
                false,
                self.log_dirty,
            )
        }?;
        self.guest_ram_mappings.push(GuestRamMapping {
            gpa: region.start_addr().raw_value(),
            size: region.len(),
            slot,
            zone_id: DEFAULT_MEMORY_ZONE.to_string(),
            virtio_mem: false,
            file_offset: 0,
        });

        self.add_region(Arc::clone(&region))?;

        Ok(region)
    }

    fn hotplug_ram_region(&mut self, size: usize) -> Result<Arc<GuestRegionMmap>, Error> {
        info!("Hotplugging new RAM: {size}");