kvm記憶體虛拟化

記憶體虛拟化，qemu這塊需要了解pc_memory_init(在這裡會調用kvm_region_add  --->  kvm_set_user_memory_region)和memory_listener_register(這裡隻是注冊)

先注冊memory listener，然後如果其他裝置添加了region，memory.c會回調這些listener，然後就kvm_set_phys_mem，走到kvm module中set slot了

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(gdb) bt #0  kvm_region_add (listener=0x555555c5efe0 <kvm_memory_listener>, section=0x7fffffffde60) at  /home/pizhi/oschina/qemu/kvm-all .c:832 #1  0x000055555562219f in address_space_update_topology_pass ([email protected]=0x555555caae00 <address_space_memory>, [email protected]= true , new_view=<optimized out>, new_view=<optimized out>, old_view=0x555556995750, old_view=0x555556995750) at  /home/pizhi/oschina/qemu/memory .c:790 #2  0x00005555556246c0 in address_space_update_topology (as=0x555555caae00 <address_space_memory>) at  /home/pizhi/oschina/qemu/memory .c:805 #3  memory_region_transaction_commit () at /home/pizhi/oschina/qemu/memory.c:845 #4  0x000055555565debd in pc_cpus_init (cpu_model=0x55555587bd2d "qemu64", [email protected]=0x55555699b680) at  /home/pizhi/oschina/qemu/hw/i386/pc .c:1159 #5  0x000055555565fb7d in pc_init1 (machine=0x5555569726c0, kvmclock_enabled=1, pci_enabled=1) at  /home/pizhi/oschina/qemu/hw/i386/pc_piix .c:150 #6  0x00005555555e5de1 in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4276