other: 0.892 device: 0.883 semantic: 0.839 graphic: 0.824 socket: 0.811 PID: 0.810 debug: 0.809 vnc: 0.801 boot: 0.792 permissions: 0.791 KVM: 0.772 files: 0.764 performance: 0.750 network: 0.717 broken "pci_add auto storage" Doing: (qemu) pci_add auto storage file=/dev/ram0,if=virtio Results in: OK domain 0, bus 0, slot 5, function 0 However no device is actually added to the guest. QEMU: Latest git code (June 9) from git://git.kernel.org/pub/scm/virt/kvm/qemu-kvm.git (seems to be broken from 0.12.1.2) KVM: Compiled from git://git.kernel.org/pub/scm/virt/kvm/kvm-kmod.git checked out (refs/remotes/origin/stable-2.6.32) Both guest and host are Ubuntu 9.10 with 2.6.32 kernel. Guest kernel has ACPI enabled (specifically, the PCI slot detection driver) Guest executed with the following parameters: -boot c -drive file=/home/eranr/kvm_images/ubuntu-9.10-2.6.32-perf.img,if=ide,boot=on -m 4096 -net nic,model=virtio -net tap,ifname=qtap0,script=no -vnc :0 -smp 1,cores=1,threads=0 -monitor tcp:localhost:6001,server,nowait Hi Eran, Could you lauch "lspci" command on guestOS to see whether there is a new pci device hot-plug in? On the other hand, the guestOS need to be configured with "CONFIG_VIRTIO_PCI", otherwise it can not contain the driver to monitor the virtio-pci device. Thanks If configure guest kernel correctly, it seems that virtio for block is OK! Could you help or send me your configure file to have a second check Thanks ======== version info =============== QEMU 0.14.50 monitor host kernel: 2.6.39 guest kernel: 2.6.32 ======== config file for kernel info =================== See attachment =========Doing on qemu monitor ================ QEMU 0.14.50 monitor - type 'help' for more information (qemu) pci_add auto storage file=/dev/ram0,if=virtio OK domain 0, bus 0, slot 3, function 0 =========Doing on guest console =============== 1. ---see the disk on guest root@qemux86-64:~# dmesg | grep 'vda' [ 245.440217] vda: unknown partition table root@qemux86-64:~# fdisk -l Disk /dev/sda: 2147 MB, 2147483648 bytes 255 heads, 63 sectors/track, 261 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk /dev/sda doesn't contain a valid partition table Disk /dev/vda: 16 MB, 16777216 bytes 16 heads, 63 sectors/track, 32 cylinders Units = cylinders of 1008 * 512 = 516096 bytes Disk /dev/vda doesn't contain a valid partition table 2. --- write content to virtio disk root@qemux86-64:~# echo 'helloHypervisor' > /dev/vda root@qemux86-64:~# head /dev/vda helloHypervisor =========Doing on host console ============= [root@oc8440477808 linux-2.6.39]# head /dev/ram0 helloHypervisor ========= conclusion ==================== Host get the data which is passed through virtio device on guest. The data is "helloHpervisor" So, the kernel version 2.6.32 can support virtio block device with correct config, especially the following must be choosen: CONFIG_VIRTIO=y CONFIG_VIRTIO_RING=y CONFIG_VIRTIO_PCI=y CONFIG_VIRTIO_BALLOON=y CONFIG_VIRTIO_BLK=y Did you remember to load PCI hotplug modules into the guest? sudo modprobe acpiphp sudo modprobe pci_hotplug this is vikas pandey, 1:would u please give me ur kernel and initrd source to me ..am also trying to add pci and usb device in guest os .. 2: i am using qemu and i am abe to run some of kernel image and initrd which is available on qemu site for testing purpose. now my ami is to connect the host usb and access the content after running iso image or specifing kernel and initrd image on qemu . for this task i have followed some procedure which is inlined.... //************************************************************************************************************************************************************************ cat /etc/lsb-release Host pc discription : DISTRIB_ID=Ubuntu DISTRIB_RELEASE=11.04 DISTRIB_CODENAME=natty DISTRIB_DESCRIPTION="Ubuntu 11.04" ==>uname -a Linux vikas-ThinkCentre-A70 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:50 UTC 2011 i686 i686 i386 GNU/Linux QEMU emulator version 1.0,1, Copyright (c) 2003-2008 Fabrice Bellard fist i have checked with iso images step 1: dd of=ubuntuimage bs=1024 seek=10485760 count=0 step 2: qemu -hda ubuntuimage -cdrom m1040_wifi.iso -usbdevice host:1e3d:2093 -m 192 -boot d usb_create: no bus specified, using "usb.0" for "usb-host" (it is a problem which is not permitting guest os to access completly even media will be detected on console while booting on qemu and we can add usb in qemu but in qemue gues os shelll it is not detecting any where ) husb: open device 1.6 husb: config #1 need -1 husb: 1 interfaces claimed for configuration 1 husb: grabbed usb device 1.6 husb: config #1 need 1 husb: 1 interfaces claimed for configuration 1 husb: config #1 need 1 husb: 1 interfaces claimed for configuration 1 =========>2nd i have used kernel and initrd image step >qemu-system-arm -kernel zImage.integrator -initrd arm_root.img -hda ubuntuimage -usb -usbdevice host:1e3d:2093 -m 128 segmantation fault //******************************************************************************************************************************************** please suggest me as soon as possible ,and please tell me that is it compulsary that use kvm and libvirt with qemu for using host usb or not.. because i have also tried alot with libvirt but every time it is having some different -2 error currently error related with libvirt is .. ==>virsh -c qemu:///system list virsh: /usr/lib/libvirt.so.0: version `LIBVIRT_0.9.3' not found (required by virsh) virsh: /usr/lib/libvirt.so.0: version `LIBVIRT_0.9.0' not found (required by virsh) virsh: /usr/lib/libvirt.so.0: version `LIBVIRT_PRIVATE_0.9.3' not found (required by virsh) virsh: /usr/lib/libvirt.so.0: version `LIBVIRT_0.9.2' not found (required by virsh plese tell me now what should ido... thanks& regards The "pci_add" command has been removed since QEMU 2.3.0, so I guess we can close this bug ... if you still can reproduce the problem with the latest version, please feel free to open this ticket again.