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Re: [Xen-devel] Xen Dom U kernel

  • To: Pasi Kärkkäinen <pasik@xxxxxx>
  • From: kishore kumar <bodkekumar@xxxxxxxxx>
  • Date: Tue, 20 Apr 2010 15:27:56 -0700
  • Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Tue, 20 Apr 2010 15:29:04 -0700
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  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
I pulled  PV guest dom U kernel from
Konrad's xen.git in git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git 
  • pv/merge.2.6.33
    • and did
    make menuconfig
    make
    make modules_install install. And below is the output I pasted. 
     
    Can you please let me know what went wrong here? 
     

    [root@localhost xen]# xm create -c /home/kishore/mar_15/xmexample1

    Using config file "/home/kishore/mar_15/xmexample1".

    Started domain Kishore_DomainU (id=1)

    Initializing cgroup subsys cpuset

    Initializing cgroup subsys cpu

    Linux version 2.6.33 (kishore@xxxxxxxxxxxxxxxxxxxxx) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-46)) #1 SMP Tue Apr 20 13:14:56 PDT 2010

    Command line: root=/volGroup01/Logvol00 ro ip=:127.0.255.255::::eth0:dhcp 4

    ACPI in unprivileged domain disabled

    BIOS-provided physical RAM map:

    Xen: 0000000000000000 - 00000000000a0000 (usable)

    Xen: 00000000000a0000 - 0000000000100000 (reserved)

    Xen: 0000000000100000 - 0000000020000000 (usable)

    NX (Execute Disable) protection: active

    DMI not present or invalid.

    No AGP bridge found

    last_pfn = 0x20000 max_arch_pfn = 0x400000000

    init_memory_mapping: 0000000000000000-0000000020000000

    RAMDISK: 029d4000 - 03008000

    No NUMA configuration found

    Faking a node at 0000000000000000-0000000020000000

    Bootmem setup node 0 0000000000000000-0000000020000000

    NODE_DATA [0000000000007000 - 000000000001efff]

    bootmap [000000000001f000 - 0000000000022fff] pages 4

    (8 early reservations) ==> bootmem [0000000000 - 0020000000]

    #0 [0000000000 - 0000001000] BIOS data page ==> [0000000000 - 0000001000]

    #1 [000310b000 - 0003128000] XEN PAGETABLES ==> [000310b000 - 0003128000]

    #2 [0001000000 - 00029b3878] TEXT DATA BSS ==> [0001000000 - 00029b3878]

    #3 [00029d4000 - 0003008000] RAMDISK ==> [00029d4000 - 0003008000]

    #4 [0003008000 - 000310b000] XEN START INFO ==> [0003008000 - 000310b000]

    #5 [0000001000 - 0000003000] TRAMPOLINE ==> [0000001000 - 0000003000]

    #6 [0000003000 - 0000007000] ACPI WAKEUP ==> [0000003000 - 0000007000]

    #7 [0000100000 - 00001e2000] PGTABLE ==> [0000100000 - 00001e2000]

    Zone PFN ranges:

    DMA 0x00000000 -> 0x00001000

    DMA32 0x00001000 -> 0x00100000

    Normal 0x00100000 -> 0x00100000

    Movable zone start PFN for each node

    early_node_map[2] active PFN ranges

    0: 0x00000000 -> 0x000000a0

    0: 0x00000100 -> 0x00020000

    SMP: Allowing 5 CPUs, 0 hotplug CPUs

    No local APIC present

    APIC: disable apic facility

    APIC: switched to apic NOOP

    PM: Registered nosave memory: 00000000000a0000 - 0000000000100000

    Allocating PCI resources starting at 20000000 (gap: 20000000:e0000000)

    Booting paravirtualized kernel on Xen

    Xen version: 3.4.3-rc4-pre (preserve-AD)

    setup_percpu: NR_CPUS:512 nr_cpumask_bits:512 nr_cpu_ids:5 nr_node_ids:1

    PERCPU: Embedded 478 pages/cpu @ffff880003c2f000 s1928344 r8192 d21352 u1957888

    pcpu-alloc: s1928344 r8192 d21352 u1957888 alloc=478*4096

    pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3 [0] 4

    Xen: using vcpu_info placement

    Built 1 zonelists in Node order, mobility grouping on. Total pages: 128951

    Policy zone: DMA32

    Kernel command line: root=/volGroup01/Logvol00 ro ip=:127.0.255.255::::eth0:dhcp 4

    PID hash table entries: 2048 (order: 2, 16384 bytes)

    Checking aperture...

    No AGP bridge found

    Memory: 472204k/524288k available (4689k kernel code, 384k absent, 51700k reserved, 6678k data, 3392k init)

    SLUB: Genslabs=14, HWalign=64, Order=0-3, MinObjects=0, CPUs=5, Nodes=1

    Hierarchical RCU implementation.

    NR_IRQS:4352 nr_irqs:312

    Console: colour dummy device 80x25

    console [tty0] enabled

    console [hvc0] enabled

    Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar

    ... MAX_LOCKDEP_SUBCLASSES: 8

    ... MAX_LOCK_DEPTH: 48

    ... MAX_LOCKDEP_KEYS: 8191

    ... CLASSHASH_SIZE: 4096

    ... MAX_LOCKDEP_ENTRIES: 16384

    ... MAX_LOCKDEP_CHAINS: 32768

    ... CHAINHASH_SIZE: 16384

    memory used by lock dependency info: 6367 kB

    per task-struct memory footprint: 2688 bytes

    allocated 5242880 bytes of page_cgroup

    please try 'cgroup_disable=memory' option if you don't want memory cgroups

    installing Xen timer for CPU 0

    Detected 3200.112 MHz processor.

    Calibrating delay loop (skipped), value calculated using timer frequency.. 6400.22 BogoMIPS (lpj=3200112)

    Security Framework initialized

    SELinux: Initializing.

    Dentry cache hash table entries: 65536 (order: 7, 524288 bytes)

    Inode-cache hash table entries: 32768 (order: 6, 262144 bytes)

    Mount-cache hash table entries: 256

    Initializing cgroup subsys ns

    Initializing cgroup subsys cpuacct

    Initializing cgroup subsys memory

    Initializing cgroup subsys devices

    Initializing cgroup subsys freezer

    Initializing cgroup subsys net_cls

    CPU: Unsupported number of siblings 32

    Performance Events: unsupported p6 CPU model 44 no PMU driver, software events only.

    lockdep: fixing up alternatives.

    SMP alternatives: switching to UP code

    ftrace: converting mcount calls to 0f 1f 44 00 00

    ftrace: allocating 27220 entries in 107 pages

    installing Xen timer for CPU 1

    lockdep: fixing up alternatives.

    SMP alternatives: switching to SMP code

    CPU: Unsupported number of siblings 32

    installing Xen timer for CPU 2

    CPU: Unsupported number of siblings 32

    installing Xen timer for CPU 3

    CPU: Unsupported number of siblings 32

    installing Xen timer for CPU 4

    CPU: Unsupported number of siblings 32

    Brought up 5 CPUs

    Grant table initialized

    regulator: core version 0.5

    Time: 165:165:165 Date: 165/165/65

    NET: Registered protocol family 16

    PCI: setting up Xen PCI frontend stub

    bio: create slab <bio-0> at 0

    ACPI: Interpreter disabled.

    xen_balloon: Initialising balloon driver.

    vgaarb: loaded

    SCSI subsystem initialized

    usbcore: registered new interface driver usbfs

    usbcore: registered new interface driver hub

    usbcore: registered new device driver usb

    PCI: System does not support PCI

    PCI: System does not support PCI

    NetLabel: Initializing

    NetLabel: domain hash size = 128

    NetLabel: protocols = UNLABELED CIPSOv4

    NetLabel: unlabeled traffic allowed by default

    Switching to clocksource xen

    kstop/0 used greatest stack depth: 6568 bytes left

    kstop/1 used greatest stack depth: 6552 bytes left

    pnp: PnP ACPI: disabled

    NET: Registered protocol family 2

    IP route cache hash table entries: 4096 (order: 3, 32768 bytes)

    TCP established hash table entries: 16384 (order: 6, 262144 bytes)

    TCP bind hash table entries: 16384 (order: 8, 1179648 bytes)

    TCP: Hash tables configured (established 16384 bind 16384)

    TCP reno registered

    UDP hash table entries: 256 (order: 3, 40960 bytes)

    UDP-Lite hash table entries: 256 (order: 3, 40960 bytes)

    NET: Registered protocol family 1

    Trying to unpack rootfs image as initramfs...

    Freeing initrd memory: 6352k freed

    DMA-API: preallocated 32768 debug entries

    DMA-API: debugging enabled by kernel config

    platform rtc_cmos: registered platform RTC device (no PNP device found)

    audit: initializing netlink socket (disabled)

    type=2000 audit(1271770990.281:1): initialized

    HugeTLB registered 2 MB page size, pre-allocated 0 pages

    VFS: Disk quotas dquot_6.5.2

    Dquot-cache hash table entries: 512 (order 0, 4096 bytes)

    msgmni has been set to 934

    cryptomgr_test used greatest stack depth: 5368 bytes left

    alg: No test for stdrng (krng)

    Block layer SCSI generic (bsg) driver version 0.4 loaded (major 252)

    io scheduler noop registered

    io scheduler deadline registered

    io scheduler cfq registered (default)

    pci_hotplug: PCI Hot Plug PCI Core version: 0.5

    pciehp: PCI Express Hot Plug Controller Driver version: 0.4

    acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5

    pci-stub: invalid id string ""

    Non-volatile memory driver v1.3

    Linux agpgart interface v0.103

    Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled

    brd: module loaded

    loop: module loaded

    input: Macintosh mouse button emulation as /class/input/input0

    Fixed MDIO Bus: probed

    ixgbe: Intel(R) 10 Gigabit PCI Express Network Driver - version 2.0.44-k2

    ixgbe: Copyright (c) 1999-2010 Intel Corporation.

    Intel(R) PRO/10GbE Network Driver - version 1.0.135-k2-NAPI

    Copyright (c) 1999-2008 Intel Corporation.

    Initialising Xen virtual ethernet driver.

    ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver

    ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver

    uhci_hcd: USB Universal Host Controller Interface driver

    blkfront: xvda2: barriers enabled

    PNP: No PS/2 controller found. Probing ports directly.

    i8042.c: No controller found.

    mice: PS/2 mouse device common for all mice

    rtc_cmos rtc_cmos: rtc core: registered rtc_cmos as rtc0

    device-mapper: uevent: version 1.0.3

    device-mapper: ioctl: 4.16.0-ioctl (2009-11-05) initialised: dm-devel@xxxxxxxxxx

    cpuidle: using governor ladder

    cpuidle: using governor menu

    usbcore: registered new interface driver hiddev

    usbcore: registered new interface driver usbhid

    usbhid: USB HID core driver

    nf_conntrack version 0.5.0 (3738 buckets, 14952 max)

    CONFIG_NF_CT_ACCT is deprecated and will be removed soon. Please use

    nf_conntrack.acct=1 kernel parameter, acct=1 nf_conntrack module option or

    sysctl net.netfilter.nf_conntrack_acct=1 to enable it.

    ip_tables: (C) 2000-2006 Netfilter Core Team

    TCP cubic registered

    Initializing XFRM netlink socket

    NET: Registered protocol family 17

    registered taskstats version 1

    No TPM chip found, activating TPM-bypass!

    XENBUS: Device with no driver: device/console/0

    Magic number: 1:252:3141

    drivers/rtc/hctosys.c: unable to open rtc device (rtc0)

    Initalizing network drop monitor service

    Freeing unused kernel memory: 3392k freed

    Write protecting the kernel read-only data: 10240k

    Freeing unused kernel memory: 1436k freed

    BUG: unable to handle kernel paging request at ffff880001499000

    IP: [<ffffffff8122b8a0>] memset_c+0x20/0x30

    PGD 1a44067 PUD 1a48067 PMD 3118067 PTE 10000001499025

    Oops: 0003 [#1] SMP

    last sysfs file:

    CPU 4

    Pid: 1, comm: swapper Not tainted 2.6.33 #1 /

    RIP: e030:[<ffffffff8122b8a0>] [<ffffffff8122b8a0>] memset_c+0x20/0x30

    RSP: e02b:ffff88001fdf7e68 EFLAGS: 00010206

    RAX: cccccccccccccccc RBX: ffffea0000000000 RCX: 0000000000000200

    RDX: 0000000000000000 RSI: 00000000000000cc RDI: ffff880001499000

    RBP: ffff88001fdf7e90 R08: 0000000000000000 R09: ffff880001499000

    R10: ffff88001fc04248 R11: ffff88001fdf7ba0 R12: ffff880001499000

    R13: ffff880001600000 R14: ffffffff81789ef8 R15: 0000000000000000

    FS: 0000000000000000(0000) GS:ffff8800043a7000(0000) knlGS:0000000000000000

    CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b

    CR2: ffff880001499000 CR3: 0000000001a43000 CR4: 0000000000002660

    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

    DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400

    Process swapper (pid: 1, threadinfo ffff88001fdf6000, task ffff88001fdf8000)

    Stack:

    ffffffff8102fdda 6db6db6db6db6db7 0000000000000400 ffff880000000000

    <0> ffffffff81600000 ffff88001fdf7ec0 ffffffff810305c6 ffffffff81e5d8a0

    <0> 0000000000000200 0000000000000200 ffffffff81b12f80 ffff88001fdf7ed0

    Call Trace:

    [<ffffffff8102fdda>] ? free_init_pages+0xa4/0xca

    [<ffffffff810305c6>] mark_rodata_ro+0xea/0x150

    [<ffffffff81002200>] init_post+0x30/0x114

    [<ffffffff81cf29a8>] kernel_init+0x1be/0x1cd

    [<ffffffff8100ab64>] kernel_thread_helper+0x4/0x10

    [<ffffffff8148d910>] ? restore_args+0x0/0x30

    [<ffffffff8100ab60>] ? kernel_thread_helper+0x0/0x10

    Code: 83 f9 ff 75 ed c9 4c 89 c0 c3 90 49 89 f9 41 89 d0 41 83 e0 07 89 d1 c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 f7 e6 <f3> 48 ab 44 89 c1 f3 aa 4c 89 c8 c3 0f 1f 40 00 eb ce 0f 1f 84

    RIP [<ffffffff8122b8a0>] memset_c+0x20/0x30

    RSP <ffff88001fdf7e68>

    CR2: ffff880001499000

    ---[ end trace 578e9e3c60fdfb1a ]---

    swapper used greatest stack depth: 4952 bytes left

    Kernel panic - not syncing: Attempted to kill init!

    Pid: 1, comm: swapper Tainted: G D 2.6.33 #1

    Call Trace:

    [<ffffffff812200af>] ? compat_blkdev_driver_ioctl+0x1e2/0xf02

    [<ffffffff8105145a>] panic+0xa5/0x171

    [<ffffffff81054e15>] ? do_exit+0x325/0x6f5

    [<ffffffff81006891>] ? xen_force_evtchn_callback+0xd/0xf

    [<ffffffff81054e15>] ? do_exit+0x325/0x6f5

    [<ffffffff81054e65>] ? do_exit+0x375/0x6f5

    [<ffffffff81054e15>] ? do_exit+0x325/0x6f5

    [<ffffffff81006f4f>] ? xen_restore_fl_direct_end+0x0/0x1

    [<ffffffff81081534>] ? lock_release+0x182/0x18d

    [<ffffffff812200af>] ? compat_blkdev_driver_ioctl+0x1e2/0xf02

    [<ffffffff8107ed49>] ? trace_hardirqs_on+0xd/0xf

    [<ffffffff8148cefb>] ? _raw_write_unlock_irq+0x37/0x3b

    [<ffffffff812200af>] ? compat_blkdev_driver_ioctl+0x1e2/0xf02

    [<ffffffff81054b6c>] do_exit+0x7c/0x6f5

    [<ffffffff81052cf2>] ? kmsg_dump+0x153/0x183

    [<ffffffff812200af>] ? compat_blkdev_driver_ioctl+0x1e2/0xf02

    [<ffffffff812200af>] ? compat_blkdev_driver_ioctl+0x1e2/0xf02

    [<ffffffff8148e850>] oops_end+0xbf/0xc7

    [<ffffffff81030eb2>] no_context+0x1fa/0x209

    [<ffffffff812200af>] ? compat_blkdev_driver_ioctl+0x1e2/0xf02

    [<ffffffff81004748>] ? xen_pmd_val+0xe/0x10

    [<ffffffff81031118>] __bad_area_nosemaphore+0x198/0x1bb

    [<ffffffff8148d940>] ? irq_return+0x0/0x10

    [<ffffffff810311c5>] bad_area_nosemaphore+0x13/0x15

    [<ffffffff81490256>] do_page_fault+0x16d/0x2a2

    [<ffffffff8148dbb5>] page_fault+0x25/0x30

    [<ffffffff8122b8a0>] ? memset_c+0x20/0x30

    [<ffffffff8102fdda>] ? free_init_pages+0xa4/0xca

    [<ffffffff810305c6>] mark_rodata_ro+0xea/0x150

    [<ffffffff81002200>] init_post+0x30/0x114

    [<ffffffff81cf29a8>] kernel_init+0x1be/0x1cd

    [<ffffffff8100ab64>] kernel_thread_helper+0x4/0x10

    [<ffffffff8148d910>] ? restore_args+0x0/0x30

    [<ffffffff8100ab60>] ? kernel_thread_helper+0x0/0x10

     
     
     


     
    On Mon, Apr 19, 2010 at 12:27 PM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:
    On Mon, Apr 19, 2010 at 12:08:35PM -0700, kishore kumar wrote:
    >    I included
    >    kernel = "/boot/vmlinuz-2.6.32.10"
    >    ramdisk = "/boot/initrd-2.6.32.10.img" (This is the same as my Dom 0.  As
    >    I am trying to boot the same Dom 0 as my Dom U without any changes)
    >

    You cannot use the dom0 initrd/ramdisk for domU!

    dom0 initrd contains drivers for the physical hardware, while in the domU initrd
    you need to have drivers for the _virtual_ hardware!

    In the log below root was not found because the drivers for the xen block devices
    are not loaded.

    -- Pasi


    >    disk = ['phy:sda2,sda2,w']
    >    root= "/dev/VolGroup01/LogVol00 ro"
    >
    >      I see my .config and I have
    >    CONFIG_XEN_BLKDEV_FRONTEND=m
    >    CONFIG_XEN_BLKDEV_BACKEND=y
    >    CONFIG_XEN_BACKEND=y
    >
    >    Below is the output pasted.  Any help please on what is going wrong here?
    >
    >    XENBUS: Device with no driver: device/vbd/2050
    >
    >    XENBUS: Device with no driver: device/vif/0
    >
    >    XENBUS: Device with no driver: device/console/0
    >
    >    Magic number: 1:252:3141
    >
    >    drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
    >
    >    Initalizing network drop monitor service
    >
    >    Freeing unused kernel memory: 3392k freed
    >
    >    Write protecting the kernel read-only data: 6912k
    >
    >    Red Hat nash version 5.1.19.6 starting
    >
    >    Mounting proc filesystem
    >
    >    Mounting sysfs filesystem
    >
    >    Creating /dev
    >
    >    Creating initial device nodes
    >
    >    Setting up hotplug.
    >
    >    Creating block device nodes.
    >
    >    Loading ehci-hcd.ko module
    >
    >    ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
    >
    >    insmod used greatest stack depth: 5712 bytes left
    >
    >    Loading ssb.ko module
    >
    >    Loading ohci-hcd.ko module
    >
    >    ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
    >
    >    Loading uhci-hcd.ko module
    >
    >    uhci_hcd: USB Universal Host Controller Interface driver
    >
    >    Scanning and configuring dmraid supported devices
    >
    >    Scanning logical volumes
    >
    >    Reading all physical volumes. This may take a while...
    >
    >    lvm used greatest stack depth: 5328 bytes left
    >
    >    Activating logical volumes
    >
    >    Volume group "VolGroup01" not found
    >
    >    Trying to resume from /dev/VolGroup01/LogVol01
    >
    >    Unable to access resume device (/dev/VolGroup01/LogVol01)
    >
    >    Creating root device.
    >
    >    Mounting root filesystem.
    >
    >    mount: could not find filesystem '/dev/root'
    >
    >    Setting up other filesystems.
    >
    >    Setting up new root fs
    >
    >    setuproot: moving /dev failed: No such file or directory
    >
    >    no fstab.sys, mounting internal defaults
    >
    >    setuproot: error mounting /proc: No such file or directory
    >
    >    setuproot: error mounting /sys: No such file or directory
    >
    >    Switching to new root and running init.
    >
    >    unmounting old /dev
    >
    >    unmounting old /proc
    >
    >    unmounting old /sys
    >
    >    switchroot: mount failed: No such file or directory
    >
    >    init used greatest stack depth: 4888 bytes left
    >
    >    Kernel panic - not syncing: Attempted to kill init!
    >
    >    Pid: 1, comm: init Not tainted 2.6.32.10 #2
    >
    >    Call Trace:
    >
    >    [<ffffffff8105b747>] panic+0xa5/0x167
    >
    >    [<ffffffff8100ed81>] ? xen_force_evtchn_callback+0xd/0xf
    >
    >    [<ffffffff81475d48>] ? _write_unlock_irq+0x30/0x3c
    >
    >    [<ffffffff8108c9f4>] ? trace_hardirqs_on_caller+0x110/0x134
    >
    >    [<ffffffff8108ca25>] ? trace_hardirqs_on+0xd/0xf
    >
    >    [<ffffffff81475d4f>] ? _write_unlock_irq+0x37/0x3c
    >
    >    [<ffffffff8105efa7>] do_exit+0x7e/0x701
    >
    >    [<ffffffff8105f6c6>] sys_exit_group+0x0/0x1b
    >
    >    [<ffffffff8105f6dd>] sys_exit_group+0x17/0x1b
    >
    >    [<ffffffff81012d72>] system_call_fastpath+0x16/0x1b
    >
    >    On Sat, Apr 17, 2010 at 5:22 AM, Pasi Kärkkäinen <[1]pasik@xxxxxx> wrote:
    >
    >      On Fri, Apr 16, 2010 at 03:24:53PM -0700, kishore kumar wrote:
    >      >    I am using my Dom 0 kernel to boot as my Dom U.
    >      >    I edited /etc/xen/xmexample1 file and modified only below lines
    >      >
    >      >    kernel="/boot/vmlinux-2.6.32.10"
    >      >    memory=512
    >      >    vcpus=5
    >      >    root = "/dev/VolGroup01/LogVol00 ro"
    >      >    Below is the output I pasted after freezing.  Not sure what is
    >      wrong.  Can
    >      >    you please help me here??
    >      >    I doubt if I have provided the correct root option?
    >      >
    >
    >      I bet that kernel has xen block frontend driver as a module?
    >
    >      You don't seem to have ramdisk/initrd image,
    >      so you simply don't have the driver loaded at all
    >      to access the root disk in the guest.
    >
    >      You must create an initrd image that loads the driver module in the
    >      guest.
    >      >
    >      >    VFS: Cannot open root device "VolGroup01/LogVol00" or
    >      unknown-block(0,0)
    >      >
    >      >    Please append a correct "root=" boot option; here are the available
    >      >    partitions:
    >      >
    >      >    Kernel panic - not syncing: VFS: Unable to mount root fs on
    >      >    unknown-block(0,0)
    >      >
    >
    >      Root was not found - this is usually because you don't have the xen
    >      blockdev frontend driver loaded.
    >      -- Pasi
    >
    > References
    >
    >    Visible links
    >    1. mailto:pasik@xxxxxx

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