Method dirty_log

vmm/src/memory_manager.rs:3267–3307

Generate a table for the pages that are dirty. The dirty pages are collapsed together in the table if they are contiguous.

(&mut self)

    // Generate a table for the pages that are dirty. The dirty pages are collapsed
    // together in the table if they are contiguous.
    fn dirty_log(&mut self) -> std::result::Result<MemoryRangeTable, MigratableError> {
        let mut table = MemoryRangeTable::default();
        for r in &self.guest_ram_mappings {
            let vm_dirty_bitmap = self.vm.get_dirty_log(r.slot, r.gpa, r.size).map_err(|e| {
                MigratableError::MigrateSend(anyhow!("Error getting VM dirty log {e}"))
            })?;
            let vmm_dirty_bitmap = match self.guest_memory.memory().find_region(GuestAddress(r.gpa))
            {
                Some(region) => {
                    assert!(region.start_addr().raw_value() == r.gpa);
                    assert!(region.len() == r.size);
                    (**region).bitmap().get_and_reset()
                }
                None => {
                    return Err(MigratableError::MigrateSend(anyhow!(
                        "Error finding 'guest memory region' with address {:x}",
                        r.gpa
                    )));
                }
            };

            let dirty_bitmap = vm_dirty_bitmap
                .iter()
                .zip(vmm_dirty_bitmap.iter())
                .map(|(x, y)| x | y);

            let sub_table = MemoryRangeTable::from_dirty_bitmap(dirty_bitmap, r.gpa, 4096);

            if sub_table.regions().is_empty() {
                debug!("Dirty Memory Range Table is empty");
            } else {
                debug!("Dirty Memory Range Table:");
                for range in sub_table.regions() {
                    debug!("GPA: {:x} size: {} (KiB)", range.gpa, range.length / 1024);
                }
            }

            table.extend(sub_table);
        }
        Ok(table)
    }
}

#[cfg(test)]