Hi all: I use KVM on Ubuntu, the version is: root@PC:/home# qemu-system-x86_64 --version QEMU emulator version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.29) Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers One PCIe card is used by one VM by pass through, and the PCIe card support hot plug. And I found that after unplugging and plugging, and PCI device being listed by command "lspci" on host, the corresponding PCI device in VM can't be list therewith. I have found workaround like rebooting the VM or running command "virsh attach-device" with a xml file defining the device as one parameter. But I still want to know if the latest KVM can do the recover automatically. Thanks Dahui