On Thu, Apr 25, 2013 at 01:40:41PM +0000, Liuji (Jeremy) wrote: > I have a question about hotplug of cd-rom. > > version of qemu: Apr-22-2013 bb71623811686ce3c34ce724f073f5c5dd95f51b > > 1) start the vm: > qemu-kvm -enable-kvm -m 1024 -smp 2 -boot c -drive > file=/home/vm/winxp.qcow2,if=none,id=drive0,format=qcow2 > -device virtio-blk-pci,scsi=off,drive=drive0,id=disk0 -monitor stdio -vnc > 186.100.8.136:1 > -device lsi,id=scsi0,bus=pci.0
The LSI SCSI controller is not actively maintained and has known issues (see the bug tracker on launchpad). You're on your own if you use this device. > 2) use "drive_add" and "device_add" commands to hotplug a cd-rom: > (qemu) drive_add 0 > file=/home/vm/aaa.iso,if=none,id=my-cdrom-drive,readonly=on,format=raw > (qemu) device_add > scsi-cd,bus=scsi0.0,scsi-id=2,drive=my-cdrom-drive,id=my-cdrom > > 3) but I can't find the new cd-rom in the WindowXP vm. > > 4) and then, I use "pci_add" command to hotplug another cd-rom: > (qemu) pci_add auto storage > file=/home/vm/bbb.iso,if=scsi,readonly=on,format=raw,media=cdrom > > 5) I not only found the second cd-rom, but also found first cd-rom in the > WindowXP vm. > > When I only use "pci_add" command, I can hotplug a cd-rom successfully. > > Would you please tell me how to use "drive_add" and "device_add" commands to > hotplug a cd-rom? The reason why pci_add appears to work is because it hotplugs a new LSI PCI adapter instead of just attaching a new SCSI CD-ROM to the existing bus. You can check this by using the Device Manager in Windows to show storage controllers/PCI adapters. Perhaps the hotplug of a new adapter causes the Windows XP SCSI subsystem to rescan all adapters... Stefan
