Re: [Xen-users] /dev/sda2 does not exist. Dropping to a shell! (

Thanks for your detailed reply. This is the configuration file I used for DomU:

kernel = '/boot/vmlinuz-2.6.32.27'

ramdisk = '/boot/initrd-2.6.32.27.img'

vcpus = '1'

memory = '512'

name = 'cloud-vm07'

vif = [ 'ip=128.10.130.192,mac=00:16:3E:AB:B1:FD,bridge=eth2' ]

disk = [ 'file:/home/hkhande/xen-image/domains/cloud-vm07/disk.img,xvda1,w',

'file:/home/hkhande/xen-image/domains/cloud-vm07/swap.img,xvda2,w' ]

extra = "root=/dev/xvda1 ro"

I am still stuck on the same error(detailed log attached below). I unsuccessfully tried adding extra = 'console=hvc0' and extra = 'console=tty'. Log shows, xen detects disk correctly when using xvda "blkfront: xvda1: barriers enabled". But it also shows "XENBUS: Device with no driver: device/console/0".

Thanks,

Hitesh

Detailed log:

$ xm create /home/hkhande/xen-image/cloud-vm07.cfg -c

Using config file "/home/hkhande/xen-image/cloud-vm07.cfg".

Started domain cloud-vm07 (id=7)

[ 0.000000] Reserving virtual address space above 0xf5800000

[ 0.000000] Initializing cgroup subsys cpuset

[ 0.000000] Initializing cgroup subsys cpu

[ 0.000000] Linux version 2.6.32.27 (hkhande@cloud12) (gcc version 4.4.5 (Ubuntu/Linaro 4.4.4-14ubuntu5) ) #4 SMP Thu Feb 10 16:18:30 EST 2011

[ 0.000000] KERNEL supported cpus:

[ 0.000000] Intel GenuineIntel

[ 0.000000] AMD AuthenticAMD

[ 0.000000] NSC Geode by NSC

[ 0.000000] Cyrix CyrixInstead

[ 0.000000] Centaur CentaurHauls

[ 0.000000] Transmeta GenuineTMx86

[ 0.000000] Transmeta TransmetaCPU

[ 0.000000] UMC UMC UMC UMC

[ 0.000000] ACPI in unprivileged domain disabled

[ 0.000000] released 0 pages of unused memory

[ 0.000000] BIOS-provided physical RAM map:

[ 0.000000] Xen: 0000000000000000 - 00000000000a0000 (usable)

[ 0.000000] Xen: 00000000000a0000 - 0000000000100000 (reserved)

[ 0.000000] Xen: 0000000000100000 - 0000000020800000 (usable)

[ 0.000000] DMI not present or invalid.

[ 0.000000] last_pfn = 0x20800 max_arch_pfn = 0x1000000

[ 0.000000] Scanning 1 areas for low memory corruption

[ 0.000000] modified physical RAM map:

[ 0.000000] modified: 0000000000000000 - 0000000000002000 (usable)

[ 0.000000] modified: 0000000000002000 - 0000000000006000 (reserved)

[ 0.000000] modified: 0000000000006000 - 00000000000a0000 (usable)

[ 0.000000] modified: 00000000000a0000 - 0000000000100000 (reserved)

[ 0.000000] modified: 0000000000100000 - 0000000020800000 (usable)

[ 0.000000] init_memory_mapping: 0000000000000000-0000000020800000

[ 0.000000] NX (Execute Disable) protection: active

[ 0.000000] RAMDISK: 01a6f000 - 01f43000

[ 0.000000] 0MB HIGHMEM available.

[ 0.000000] 520MB LOWMEM available.

[ 0.000000] mapped low ram: 0 - 20800000

[ 0.000000] low ram: 0 - 20800000

[ 0.000000] node 0 low ram: 00000000 - 20800000

[ 0.000000] node 0 bootmap 00007000 - 0000b100

[ 0.000000] (11 early reservations) ==> bootmem [0000000000 - 0020800000]

[ 0.000000] #0 [0000000000 - 0000001000] BIOS data page ==> [0000000000 - 0000001000]

[ 0.000000] #1 [0001fc6000 - 0001fda000] XEN PAGETABLES ==> [0001fc6000 - 0001fda000]

[ 0.000000] #2 [0000001000 - 0000002000] EX TRAMPOLINE ==> [0000001000 - 0000002000]

[ 0.000000] #3 [0000006000 - 0000007000] TRAMPOLINE ==> [0000006000 - 0000007000]

[ 0.000000] #4 [0001000000 - 00018fe7e0] TEXT DATA BSS ==> [0001000000 - 00018fe7e0]

[ 0.000000] #5 [0001a6f000 - 0001f43000] RAMDISK ==> [0001a6f000 - 0001f43000]

[ 0.000000] #6 [0001f43000 - 0001fc6000] XEN START INFO ==> [0001f43000 - 0001fc6000]

[ 0.000000] #7 [0020000000 - 0020800000] XEN EXTRA ==> [0020000000 - 0020800000]

[ 0.000000] #8 [00018ff000 - 000190c000] BRK ==> [00018ff000 - 000190c000]

[ 0.000000] #9 [0000100000 - 00001ef000] PGTABLE ==> [0000100000 - 00001ef000]

[ 0.000000] #10 [0000007000 - 000000c000] BOOTMAP ==> [0000007000 - 000000c000]

[ 0.000000] Zone PFN ranges:

[ 0.000000] DMA 0x00000000 -> 0x00001000

[ 0.000000] Normal 0x00001000 -> 0x00020800

[ 0.000000] HighMem 0x00020800 -> 0x00020800

[ 0.000000] Movable zone start PFN for each node

[ 0.000000] early_node_map[3] active PFN ranges

[ 0.000000] 0: 0x00000000 -> 0x00000002

[ 0.000000] 0: 0x00000006 -> 0x000000a0

[ 0.000000] 0: 0x00000100 -> 0x00020800

[ 0.000000] Using APIC driver default

[ 0.000000] SMP: Allowing 1 CPUs, 0 hotplug CPUs

[ 0.000000] Local APIC disabled by BIOS -- you can enable it with "lapic"

[ 0.000000] APIC: disable apic facility

[ 0.000000] PM: Registered nosave memory: 0000000000002000 - 0000000000006000

[ 0.000000] PM: Registered nosave memory: 00000000000a0000 - 0000000000100000

[ 0.000000] Allocating PCI resources starting at 20800000 (gap: 20800000:df800000)

[ 0.000000] Booting paravirtualized kernel on Xen

[ 0.000000] Xen version: 4.0.1 (preserve-AD)

[ 0.000000] NR_CPUS:8 nr_cpumask_bits:8 nr_cpu_ids:1 nr_node_ids:1

[ 0.000000] PERCPU: Embedded 15 pages/cpu @c23ee000 s37080 r0 d24360 u65536

[ 0.000000] pcpu-alloc: s37080 r0 d24360 u65536 alloc=16*4096

[ 0.000000] pcpu-alloc: [0] 0

[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 131980

[ 0.000000] Kernel command line: root=/dev/xvda1 ro

[ 0.000000] PID hash table entries: 4096 (order: 2, 16384 bytes)

[ 0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)

[ 0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)

[ 0.000000] Enabling fast FPU save and restore... done.

[ 0.000000] Enabling unmasked SIMD FPU exception support... done.

[ 0.000000] Initializing CPU#0

[ 0.000000] Initializing HighMem for node 0 (00000000:00000000)

[ 0.000000] Memory: 502808k/532480k available (5048k kernel code, 29012k reserved, 2956k data, 464k init, 0k highmem)

[ 0.000000] virtual kernel memory layout:

[ 0.000000] fixmap : 0xf571d000 - 0xf57ff000 ( 904 kB)

[ 0.000000] pkmap : 0xf5200000 - 0xf5400000 (2048 kB)

[ 0.000000] vmalloc : 0xe1000000 - 0xf51fe000 ( 321 MB)

[ 0.000000] lowmem : 0xc0000000 - 0xe0800000 ( 520 MB)

[ 0.000000] .init : 0xc17d2000 - 0xc1846000 ( 464 kB)

[ 0.000000] .data : 0xc14ee376 - 0xc17d175c (2956 kB)

[ 0.000000] .text : 0xc1000000 - 0xc14ee376 (5048 kB)

[ 0.000000] SLUB: Genslabs=13, HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1

[ 0.000000] Hierarchical RCU implementation.

[ 0.000000] NR_IRQS:2304 nr_irqs:512

[ 0.000000] Console: colour dummy device 80x25

[ 0.000000] console [tty0] enabled

[ 0.000000] console [hvc0] enabled

[ 0.000000] installing Xen timer for CPU 0

[ 0.000000] Detected 2327.530 MHz processor.

[ 0.000999] Calibrating delay loop (skipped), value calculated using timer frequency.. 4655.06 BogoMIPS (lpj=2327530)

[ 0.000999] Security Framework initialized

[ 0.000999] SELinux: Initializing.

[ 0.000999] Mount-cache hash table entries: 512

[ 0.000999] Initializing cgroup subsys ns

[ 0.000999] Initializing cgroup subsys cpuacct

[ 0.000999] Initializing cgroup subsys freezer

[ 0.000999] CPU: L1 I cache: 32K, L1 D cache: 32K

[ 0.000999] CPU: L2 cache: 6144K

[ 0.000999] CPU: Unsupported number of siblings 4

[ 0.000999] Performance Events: unsupported p6 CPU model 23 no PMU driver, software events only.

[ 0.001709] SMP alternatives: switching to UP code

[ 0.002667] Freeing SMP alternatives: 21k freed

[ 0.003026] Brought up 1 CPUs

[ 0.003841] Grant table initialized

[ 0.023747] Time: 165:165:165 Date: 165/165/65

[ 0.023825] NET: Registered protocol family 16

[ 0.024996] PCI: setting up Xen PCI frontend stub

[ 0.044214] bio: create slab <bio-0> at 0

[ 0.044424] ACPI: Interpreter disabled.

[ 0.044654] xen_balloon: Initialising balloon driver with page order 0.

[ 0.044808] last_pfn = 0x20800 max_arch_pfn = 0x1000000

[ 0.045178] vgaarb: loaded

[ 0.045532] SCSI subsystem initialized

[ 0.046184] usbcore: registered new interface driver usbfs

[ 0.046273] usbcore: registered new interface driver hub

[ 0.046384] usbcore: registered new device driver usb

[ 0.046941] PCI: System does not support PCI

[ 0.046950] PCI: System does not support PCI

[ 0.047488] cfg80211: Using static regulatory domain info

[ 0.047497] cfg80211: Regulatory domain: US

[ 0.047504] (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)

[ 0.047514] (2402000 KHz - 2472000 KHz @ 40000 KHz), (600 mBi, 2700 mBm)

[ 0.047523] (5170000 KHz - 5190000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)

[ 0.047532] (5190000 KHz - 5210000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)

[ 0.047541] (5210000 KHz - 5230000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)

[ 0.047550] (5230000 KHz - 5330000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)

[ 0.047559] (5735000 KHz - 5835000 KHz @ 40000 KHz), (600 mBi, 3000 mBm)

[ 0.047576] cfg80211: Calling CRDA for country: US

[ 0.047657] NetLabel: Initializing

[ 0.047992] NetLabel: domain hash size = 128

[ 0.047992] NetLabel: protocols = UNLABELED CIPSOv4

[ 0.047992] NetLabel: unlabeled traffic allowed by default

[ 0.048339] Switching to clocksource xen

[ 0.052783] pnp: PnP ACPI: disabled

[ 0.054122] NET: Registered protocol family 2

[ 0.054199] IP route cache hash table entries: 8192 (order: 3, 32768 bytes)

[ 0.054441] TCP established hash table entries: 32768 (order: 6, 262144 bytes)

[ 0.054569] TCP bind hash table entries: 32768 (order: 6, 262144 bytes)

[ 0.054689] TCP: Hash tables configured (established 32768 bind 32768)

[ 0.054704] TCP reno registered

[ 0.054788] NET: Registered protocol family 1

[ 0.054908] RPC: Registered udp transport module.

[ 0.054918] RPC: Registered tcp transport module.

[ 0.054926] RPC: Registered tcp NFSv4.1 backchannel transport module.

[ 0.054996] Trying to unpack rootfs image as initramfs...

[ 0.062727] Freeing initrd memory: 4944k freed

[ 0.064711] kvm: no hardware support

[ 0.064732] has_svm: not amd

[ 0.064738] kvm: no hardware support

[ 0.065187] platform rtc_cmos: registered platform RTC device (no PNP device found)

[ 0.066053] microcode: no support for this CPU vendor

[ 0.066069] Scanning for low memory corruption every 60 seconds

[ 0.066652] audit: initializing netlink socket (disabled)

[ 0.066681] type=2000 audit(1299816305.332:1): initialized

[ 0.080228] HugeTLB registered 2 MB page size, pre-allocated 0 pages

[ 0.085543] VFS: Disk quotas dquot_6.5.2

[ 0.085665] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)

[ 0.087947] msgmni has been set to 992

[ 0.088955] alg: No test for stdrng (krng)

[ 0.089248] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 252)

[ 0.089260] io scheduler noop registered

[ 0.089267] io scheduler anticipatory registered

[ 0.089275] io scheduler deadline registered

[ 0.089391] io scheduler cfq registered (default)

[ 0.089645] pci_hotplug: PCI Hot Plug PCI Core version: 0.5

[ 0.094312] Event-channel device installed.

[ 0.099563] registering netback

[ 0.108167] Non-volatile memory driver v1.3

[ 0.108179] Linux agpgart interface v0.103

[ 0.108432] [drm] Initialized drm 1.1.0 20060810

[ 0.108446] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled

[ 0.113145] brd: module loaded

[ 0.114923] loop: module loaded

[ 0.136811] input: Macintosh mouse button emulation as /devices/virtual/input/input0

[ 0.137988] Intel(R) PRO/1000 Network Driver - version 7.3.21-k5-NAPI

[ 0.138137] e1000e: Intel(R) PRO/1000 Network Driver - 1.0.2-k2

[ 0.138347] e100: Intel(R) PRO/100 Network Driver, 3.5.24-k2-NAPI

[ 0.138605] sky2 driver version 1.25

[ 0.138776] Initialising Xen virtual ethernet driver.

[ 0.150638] blkfront: xvda1: barriers enabled (tag)

[ 0.155734] console [netcon0] enabled

[ 0.155741] netconsole: network logging started

[ 0.156049] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver

[ 0.156150] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver

[ 0.156246] uhci_hcd: USB Universal Host Controller Interface driver

[ 0.156516] usbcore: registered new interface driver usblp

[ 0.156526] Initializing USB Mass Storage driver...

[ 0.156616] usbcore: registered new interface driver usb-storage

[ 0.156626] USB Mass Storage support registered.

[ 0.156720] usbcore: registered new interface driver libusual

[ 0.157132] PNP: No PS/2 controller found. Probing ports directly.

[ 0.158006] i8042.c: No controller found.

[ 0.249410] mice: PS/2 mouse device common for all mice

[ 0.250076] rtc_cmos rtc_cmos: rtc core: registered rtc_cmos as rtc0

[ 0.250867] device-mapper: ioctl: 4.15.0-ioctl (2009-04-01) initialised: dm-devel@xxxxxxxxxx

[ 0.251156] cpuidle: using governor ladder

[ 0.251165] cpuidle: using governor menu

[ 0.254131] usbcore: registered new interface driver hiddev

[ 0.254228] usbcore: registered new interface driver usbhid

[ 0.254241] usbhid: v2.6:USB HID core driver

[ 0.254379] Advanced Linux Sound Architecture Driver Version 1.0.21.

[ 0.257390] ALSA device list:

[ 0.257399] No soundcards found.

[ 0.257433] Netfilter messages via NETLINK v0.30.

[ 0.257466] nf_conntrack version 0.5.0 (8192 buckets, 32768 max)

[ 0.257842] ctnetlink v0.93: registering with nfnetlink.

[ 0.258421] TCP cubic registered

[ 0.258429] Initializing XFRM netlink socket

[ 0.259203] NET: Registered protocol family 10

[ 0.260184] IPv6 over IPv4 tunneling driver

[ 0.260838] NET: Registered protocol family 17

[ 0.260899] Using IPI No-Shortcut mode

[ 0.261295] registered taskstats version 1

[ 0.263557] blkfront: xvda2: barriers enabled (tag)

[ 0.361037] XENBUS: Device with no driver: device/console/0

[ 0.361067] Magic number: 1:252:3141

[ 0.361153] Freeing unused kernel memory: 464k freed

[ 0.362967] Write protecting the kernel text: 5052k

[ 0.363759] Write protecting the kernel read-only data: 2428k

Loading, please wait...

mount: mounting none on /dev failed: No such device

W: devtmpfs not available, falling back to tmpfs for /dev

Begin: Loading essential drivers ... done.

Begin: Running /scripts/init-premount ... done.

Begin: Mounting root file system ... Begin: Running /scripts/local-top ... done.

Begin: Running /scripts/local-premount ... done.

[ 5.573302] EXT3-fs: INFO: recovery required on readonly filesystem.

[ 5.573326] EXT3-fs: write access will be enabled during recovery.

[ 5.575439] kjournald starting. Commit interval 5 seconds

[ 5.575464] EXT3-fs: recovery complete.

[ 5.575754] EXT3-fs: mounted filesystem with writeback data mode.

Begin: Running /scripts/local-bottom ... done.

done.

Begin: Running /scripts/init-bottom ... done.

init: ureadahead main process (803) terminated with status 5

On Thu, Mar 10, 2011 at 8:21 PM, Fajar A. Nugraha <list@xxxxxxxxx> wrote:

On Fri, Mar 11, 2011 at 7:35 AM, Hitesh Khandelwal

<hitesh.iitk@xxxxxxxxx> wrote:
> Replied inline:
> On Wed, Mar 9, 2011 at 9:33 PM, Fajar A. Nugraha <list@xxxxxxxxx> wrote:
>>
>> On Thu, Mar 10, 2011 at 7:34 AM, Hitesh Khandelwal
>> <hitesh.iitk@xxxxxxxxx> wrote:
>> > root = '/dev/sda2 ro'
>>
>> For starters, change that to /dev/xvda2
>>
>> > disk = [
>> >
>> > 'file:/home/hkhande/xen-image/domains/cloud-vm06/disk.img,sda2,w',
>>
>> ... and here as well. Though newer kernel version will silently change
>> sd* to xvd*, sometimes the mapping seems inconsistent (sda -> xvde)
>
>
> As I already mentioned in my earlier post, I tried xvda as well. This is the
> error I received:
> Loading, please wait...

You DO know that those limited error message is almost useless, right?
You need to remove "quiet" and "rhgb" (if present in kernel agrs) and
add "console=hvc0" (if you also have vfb enabled) to get informative
boot message on domU's xen console. Logs like these one are
particularly useful

[ 0.181537] XENBUS: Device with no driver: device/vbd/51712
[ 0.181543] XENBUS: Device with no driver: device/vif/0
[ 0.181548] XENBUS: Device with no driver: device/console/0

... which shows that domU detects some devices

[ 0.388665] blkfront device/vbd/51712 num-ring-pages 1 nr_ents 32.
[ 0.401714] blkfront: sda: barriers enabled
[ 0.402322] sda: sda1 sda2

... which shows that the disk was mapped as xvda (vbd/51712), but the
kernel use "sda" as device name

or

[ 0.175140] XENBUS: Device with no driver: device/vbd/51712
[ 0.811357] blkfront: xvda: barriers enabled
[ 0.812448] xvda: xvda1 xvda2 xvda3

... which shows that the disk was mapped as xvda (vbd/51712), and the
kernel use "xvda" as device name

It's useful because (for instance) in Ubuntu Maverick's
linux-image-2.6.35-25-generic detects the disk sda (even though I use
xvda in domU config file), while Lucid's linux-image-2.6.32-29-virtual
detects it as xvda.

... or you could just use "root=UUID=...." or "root=LABEL=..." and
don't care about sda/xvda mappings.

Also, I think it's better to use "extra" instead of "root" on Xen
config file, so you can just copy the kernel command line from
grub/grub2's menu.lst/grub.cfg. Depending on what you currently have
on grub.cfg, the "extra" line should look like

extra=" root=LABEL=ROOT ro"

or

extra=" root=UUID=9aab45dc-4bcf-426e-947c-c027db28b098 ro"

> mount: mounting none on /dev failed: No such device
> W: devtmpfs not available, falling back to tmpfs for /dev
> Begin: Loading essential drivers ... done.
> Begin: Running /scripts/init-premount ... done.
> Begin: Mounting root file system ... Begin: Running /scripts/local-top ...
> done.
> Begin: Running /scripts/local-premount ... done.
> [ 5.572796] kjournald starting. Commit interval 5 seconds
> [ 5.572824] EXT3-fs: mounted filesystem with writeback data mode.
> Begin: Running /scripts/local-bottom ... done.
> done.
> Begin: Running /scripts/init-bottom ... done.
> init: ureadahead main process (803) terminated with status 5

This actually look like a complete boot process. You just don't have
the login prompt. Try removing "xencons=hvc" from your "extra" line
(do you even have that in your grub.cfg?).

I use something like this to detect whether hvc0 or ttyS0 is
available, and spawn a login prompt there

#=======================================================
# cat /etc/init/hvc0.conf
# hvc0 - getty
#
# This service maintains a getty on hvc0 from the point the system is
# started until it is shut down again.

start on stopped rc RUNLEVEL=[2345]
stop on runlevel [!2345]

pre-start script
test -c /dev/hvc0 && echo >> /dev/hvc0 || { stop; exit 0; }
end script

respawn
exec /sbin/getty -8 38400 hvc0
#=======================================================

for ttyS0 just create a new file, changing the file name and content
replacing "hvc0" with "tty0". This way whatever console I have (hvc0
when booting PV, ttyS0 when booting HVM) I'll be able to access it.

> I meant, I want to use the same xen kernel I compiled for running Dom0.
> because this
> patch: http://lists.xensource.com/archives/html/xen-devel/2010-10/msg01261.html
> is still absent in ubuntu stock kernels. That patch is part of xen kernel I
> compiled for Dom0, hence want to use the same kernel for DomU as well. Can
> you please elaborate how to use Dom0 kernel and initramfs for booting DomU?

The easiest way? Just install the compiled kernel inside domU. Use
make-kpkg to make your life easier.

>
>>
>> > I also modified /etc/initramfs-tools/modules in Dom0 to include
>> > scsi_mod, sd_mod, blkbk modules, followed by update-initramfs.
>>
>> ... as shown here.
>>
>> blkbk is xen block backend device driver, needed by dom0 but not
>> needed by domU. domU needs xen_blkfront and xen_netfront.
>>

... or do what you already do, but make sure xen_blkfront is also
loaded. Although from your last log it seems the disk is already
detected correctly when you use xvda. You're just missing the login
prompt.

--
Fajar

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Re: [Xen-users] /dev/sda2 does not exist. Dropping to a shell! (Dom0: Ub