MemoryRegionSection
MemoryListener
KVMSlot
kvm_dirty_log
ram_list
AddressSpace
MemoryRegion/MemoryRegionSection
FlatView/FlatRange
RAMBlock
kvm_cpu_exec
MEMORY_LISTENER_UPDATE_REGION
https://martins3.github.io/qemu/memory.html#overview
https://github.com/GiantVM/doc/blob/9bb4f0ea40bb342b1c47b2256510cb394429c127/pci.md
https://blog.csdn.net/woai110120130/article/details/102312695
https://martins3.github.io/img/qemu-address-space.svg
https://kernelnote.com/qemu-qom-init-virtio-dev.html
https://66ring.github.io/2021/04/17/universe/qemu/QOM_usage:how_qemu_register_a_ram/