Re: Scrubbing free ram

[Bei Guan <gbtju85@gmail.com>]

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>
> >
> > Now, I change my domain0 OS to fedora11_x86-64bit and I can successfully
> > install the xen 4.0. However I have another problem. When I running the
>
> So you solved your problem by building the 64-bit Dom0. Is your
> userspace 64-bit or is it 32-bit? When you say 'change my domain0' was
> that a re-install of Fedora Core 11?
>


Yes, I have re-install the 64-bit Fedora Core 11. My userspace is 64-bit
now.




> > command "xend start", I got the error messages:
> >
> > [root@localhost ~]# xend start
> > ERROR Internal error: Could not obtain handle on privileged command
>
> Run 'modprobe xenfs' and 'modprobe xen-evtchn'
>
>
I don't know why my Dom0 don't have the two modules. But I can find them in
the source of pvops kernel.
The error of  running the two commands as following.

[root@localhost ~]# modprobe xenfs
WARNING: Deprecated config file /etc/modprobe.conf, all config files belong
into /etc/modprobe.d/.
FATAL: Module xenfs not found.
[root@localhost ~]# modprobe xen-evtchn
WARNING: Deprecated config file /etc/modprobe.conf, all config files belong
into /etc/modprobe.d/.
FATAL: Module xen_evtchn not found.



> > interface (2 = No such file or directory)
> > Traceback (most recent call last):
> >   File "/usr/sbin/xend", line 36, in <module>
> >     from xen.xend.server import SrvDaemon
> >   File "usr/lib64/python2.6/site-packages/xen/xend/server/SrvDaemon.py",
> > line 26, in <module>
> >   File "usr/lib64/python2.6/site-packages/xen/xend/server/relocate.py",
> line
> > 28, in <module>
> >   File "usr/lib64/python2.6/site-packages/xen/xend/XendDomain.py", line
> 36,
> > in <module>
> >   File "usr/lib64/python2.6/site-packages/xen/xend/XendCheckpoint.py",
> line
> > 20, in <module>
> >   File "usr/lib64/python2.6/site-packages/xen/xend/image.py", line 46, in
> > <module>
> > xen.lowlevel.xc.Error: (1, 'Internal error', 'Could not obtain handle on
> > privileged command interface (2 = No such file or directory)')
> >
> > I googled the problem and found it seems to be a bug, which refered here:
> > http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1436
> >
> >
> >
> > If I running another command "/etc/init.d/xend start", it can
> successfully
> > start the xend service. But I can not create a PV DomU or HVM DomU. The
> > error message as following.
>
> That one is fairly easy. You don't have the right 'root' entry for your
> guest (you are missing the right root="/dev/<something, something>").
>
> It looks to be that you are trying to do '/dev/sda1' but since you
> changed your disk=['...'] entry to have 'xvda', it should be
> '/dev/xvda1'
>
>
Yes, I solved this problem. However, I still can not create the PV domU. The
process of creating pv domU stopped at the
" * Restarting OpenBSD Secure Shell server sshd   ...done. "  Complete
messages is attached. My  PV config file is:

kernel = "/boot/vmlinuz-2.6.31.13"
memory = "256"
name = "ubuntu.9-04"
vif = ['']
#dhcp = "dhcp"
disk = ['file:/root/Xen/img/ubuntu-32/ubuntu.9-04.x86.img,xvda1,w']
root = "/dev/xvda1 ro"
extra = 'xencons=tty'




> >
> > 1. Error of starting a PV DomU
> > [root@localhost ubuntu-32]# xm create ubuntu.9-04.x86.xen3.cfg -c
> > ……  ……
> > [    1.831122] Sending DHCP requests ...
> > [   14.320061] ... timed out!
> > [   75.986391] IP-Config: Reopening network devices...
> > [   77.488086] Sending DHCP requests ...
> > [   93.965059] ... timed out!
> > [  165.740440] IP-Config: Auto-configuration of network failed.
> > [  165.740565] md: Waiting for all devices to be available before
> autodetect
> > [  165.740587] md: If you don't use raid, use raid=noautodetect
> > [  165.741555] md: Autodetecting RAID arrays.
> > [  165.741577] md: Scanned 0 and added 0 devices.
> > [  165.741596] md: autorun ...
> > [  165.741614] md: ... autorun DONE.
> > [  165.741921] Root-NFS: No NFS server available, giving up.
> > [  165.741984] VFS: Unable to mount root fs via NFS, trying floppy.
> > [  165.742429] VFS: Cannot open root device "sda1" or unknown-block(2,0)
> > [  165.742452] Please append a correct "root=" boot option; here are the
> > available partitions:
> > [  165.742529] ca01         1025024 xvda1 driver: vbd
>
>                                       ^^^^ - use that one instead of
> sda1
>
> > [  165.742566] Kernel panic - not syncing: VFS: Unable to mount root fs
> on
> > unknown-block(2,0)
> > [  165.742590] Pid: 1, comm: swapper Not tainted 2.6.31.13 #1
> > [  165.742610] Call Trace:
> > [  165.742642]  [<ffffffff81591fd2>] panic+0x75/0x130
> > [  165.742674]  [<ffffffff8195fafe>] mount_block_root+0x1ce/0x1e5
> > [  165.742705]  [<ffffffff8195fb80>] mount_root+0x6b/0x8b
> > [  165.742734]  [<ffffffff8195fd10>] prepare_namespace+0x170/0x19d
> > [  165.742765]  [<ffffffff8195efc0>] kernel_init+0x1b5/0x1c5
> > [  165.742797]  [<ffffffff81033dea>] child_rip+0xa/0x20
> > [  165.742827]  [<ffffffff81032fa7>] ? int_ret_from_sys_call+0x7/0x1b
> > [  165.742858]  [<ffffffff8103375d>] ? retint_restore_args+0x5/0x6
> > [  165.742889]  [<ffffffff81033de0>] ? child_rip+0x0/0x20
> >
> > (Attached is the complete messages)
> >
> > 2. Error of starting a HVM DomU
> > [root@localhost windowsxp]# xm create winxp2_xen4.hvm
> > Using config file "./winxp2_xen4.hvm".
> > Error: Domain 'WinXP_HVMDomain' does not exist.
> >
> > ("WinXP_HVMDomain" is my HVM DomU name)
>
> No idea without cranking up some debug options. Look up
> http://wiki.xensource.com/xenwiki/XenParavirtOps at the debug option.
>

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[-- Attachment #2: message of creating pv DomU --]
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[root@localhost ubuntu-32]# xm create ubuntu.9-04.x86.xen3.cfg -c
Using config file "./ubuntu.9-04.x86.xen3.cfg".
Started domain ubuntu.9-04 (id=1)
                                 [    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Linux version 2.6.31.13 (root@localhost.localdomain) (gcc version 4.4.1 20090725 (Red Hat 4.4.1-2) (GCC) ) #1 SMP Tue May 4 18:15:12 CST 2010
[    0.000000] Command line: root=/dev/xvda1 ro xencons=tty
[    0.000000] KERNEL supported cpus:
[    0.000000]   Intel GenuineIntel
[    0.000000]   AMD AuthenticAMD
[    0.000000]   Centaur CentaurHauls
[    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 - 0000000010000000 (usable)
[    0.000000] DMI not present or invalid.
[    0.000000] last_pfn = 0x10000 max_arch_pfn = 0x400000000
[    0.000000] Scanning 1 areas for low memory corruption
[    0.000000] modified physical RAM map:
[    0.000000]  modified: 0000000000000000 - 0000000000001000 (usable)
[    0.000000]  modified: 0000000000001000 - 0000000000006000 (reserved)
[    0.000000]  modified: 0000000000006000 - 00000000000a0000 (usable)
[    0.000000]  modified: 00000000000a0000 - 0000000000100000 (reserved)
[    0.000000]  modified: 0000000000100000 - 0000000010000000 (usable)
[    0.000000] init_memory_mapping: 0000000000000000-0000000010000000
[    0.000000] (6 early reservations) ==> bootmem [0000000000 - 0010000000]
[    0.000000]   #0 [0000000000 - 0000001000]   BIOS data page ==> [0000000000 - 0000001000]
[    0.000000]   #1 [0001b93000 - 0001ba6000]   XEN PAGETABLES ==> [0001b93000 - 0001ba6000]
[    0.000000]   #2 [0000006000 - 0000008000]       TRAMPOLINE ==> [0000006000 - 0000008000]
[    0.000000]   #3 [0001000000 - 0001aef1f4]    TEXT DATA BSS ==> [0001000000 - 0001aef1f4]
[    0.000000]   #4 [0001b10000 - 0001b93000]   XEN START INFO ==> [0001b10000 - 0001b93000]
[    0.000000]   #5 [0000008000 - 0000074000]          PGTABLE ==> [0000008000 - 0000074000]
[    0.000000] Zone PFN ranges:
[    0.000000]   DMA      0x00000000 -> 0x00001000
[    0.000000]   DMA32    0x00001000 -> 0x00100000
[    0.000000]   Normal   0x00100000 -> 0x00100000
[    0.000000] Movable zone start PFN for each node
[    0.000000] early_node_map[3] active PFN ranges
[    0.000000]     0: 0x00000000 -> 0x00000001
[    0.000000]     0: 0x00000006 -> 0x000000a0
[    0.000000]     0: 0x00000100 -> 0x00010000
[    0.000000] SMP: Allowing 1 CPUs, 0 hotplug CPUs
[    0.000000] No local APIC present
[    0.000000] APIC: disable apic facility
[    0.000000] PM: Registered nosave memory: 0000000000001000 - 0000000000006000
[    0.000000] PM: Registered nosave memory: 00000000000a0000 - 0000000000100000
[    0.000000] Allocating PCI resources starting at 10000000 (gap: 10000000:f0000000)
[    0.000000] NR_CPUS:8 nr_cpumask_bits:8 nr_cpu_ids:1 nr_node_ids:1
[    0.000000] PERCPU: Allocated 22 4k pages, static data 88160 bytes
[    0.000000] Xen: using vcpu_info placement
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 64428
[    0.000000] Kernel command line: root=/dev/xvda1 ro xencons=tty
[    0.000000] PID hash table entries: 1024 (order: 10, 8192 bytes)
[    0.000000] Dentry cache hash table entries: 32768 (order: 6, 262144 bytes)
[    0.000000] Inode-cache hash table entries: 16384 (order: 5, 131072 bytes)
[    0.000000] Initializing CPU#0
[    0.000000] Checking aperture...
[    0.000000] No AGP bridge found
[    0.000000] Memory: 245060k/262144k available (5739k kernel code, 404k absent, 16376k reserved, 3763k data, 572k init)
[    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:4352 nr_irqs:256
[    0.000000] Detected 2660.076 MHz processor.
[    0.000999] Console: colour dummy device 80x25
[    0.000999] console [tty0] enabled
[    0.000999] console [hvc0] enabled
[    0.000999] installing Xen timer for CPU 0
[    0.000999] xen: vcpu_time_info placement not supported
[    0.000999] Calibrating delay loop (skipped), value calculated using timer frequency.. 5320.15 BogoMIPS (lpj=2660076)
[    0.000999] Security Framework initialized
[    0.000999] SELinux:  Initializing.
[    0.000999] Mount-cache hash table entries: 256
[    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: 3072K
[    0.000999] CPU: Unsupported number of siblings 4
[    0.000999] Performance Counters: unsupported p6 CPU model 23 no PMU driver, software counters only.
[    0.000999] SMP alternatives: switching to UP code
[    0.001820] Freeing SMP alternatives: 39k freed
[    0.001999] cpu 0 spinlock event irq 254
[    0.002370] Brought up 1 CPUs
[    0.003780] Booting paravirtualized kernel on Xen
[    0.003797] Xen version: 4.0.0 (preserve-AD)
[    0.004419] Grant tables using version 2 layout.
[    0.004454] Grant table initialized
[    0.024138] Time: 165:165:165  Date: 165/165/65
[    0.024370] NET: Registered protocol family 16
[    0.025496] xenbus_probe wake_waiting
[    0.025521] xenbus_probe_init ok
[    0.026995] PCI: setting up Xen PCI frontend stub
[    0.064990] bio: create slab <bio-0> at 0
[    0.065494] ACPI: Interpreter disabled.
[    0.066333] xenbus_probe_backend_init bus registered ok
[    0.066349] xenbus_probe_devices backend
[    0.083078] xenbus_probe_devices failed xenbus_directory
[    0.083078] backend_probe_and_watch devices probed ok
[    0.083103] backend_probe_and_watch watch add ok ok
[    0.083103] backend_probe_and_watch all done
[    0.083386] xenbus_probe_frontend_init bus registered ok
[    0.083407] xenbus_probe_devices device
[    0.083438] xenbus_probe_devices 1/3 vbd
[    0.083438] xenbus_probe_device_type type vbd
[    0.084055] xenbus_probe_device_type 1/1 51713
[    0.084297] xenbus_probe_device_type done
[    0.084317] xenbus_probe_devices 2/3 vif
[    0.084335] xenbus_probe_device_type type vif
[    0.084367] xenbus_probe_device_type 1/1 0
[    0.085067] xenbus_probe_device_type done
[    0.085087] xenbus_probe_devices 3/3 console
[    0.085106] xenbus_probe_device_type type console
[    0.085137] xenbus_probe_device_type 1/1 0
[    0.085293] xenbus_probe_device_type done
[    0.085312] xenbus_probe_devices done
[    0.085331] frontend_probe_and_watch devices probed ok
[    0.085367] frontend_probe_and_watch watch add ok ok
[    0.085367] frontend_probe_and_watch all done
[    0.085367] xen_balloon: Initialising balloon driver with page order 0.
[    0.087729] SCSI subsystem initialized
[    0.089456] usbcore: registered new interface driver usbfs
[    0.089731] usbcore: registered new interface driver hub
[    0.090121] usbcore: registered new device driver usb
[    0.091782] PCI: System does not support PCI
[    0.091803] PCI: System does not support PCI
[    0.093167] cfg80211: Using static regulatory domain info
[    0.093189] cfg80211: Regulatory domain: US
[    0.093207] 	(start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[    0.093230] 	(2402000 KHz - 2472000 KHz @ 40000 KHz), (600 mBi, 2700 mBm)
[    0.093985] 	(5170000 KHz - 5190000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)
[    0.093985] 	(5190000 KHz - 5210000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)
[    0.093985] 	(5210000 KHz - 5230000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)
[    0.093985] 	(5230000 KHz - 5330000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)
[    0.093985] 	(5735000 KHz - 5835000 KHz @ 40000 KHz), (600 mBi, 3000 mBm)
[    0.094060] cfg80211: Calling CRDA for country: US
[    0.094243] NetLabel: Initializing
[    0.094259] NetLabel:  domain hash size = 128
[    0.094273] NetLabel:  protocols = UNLABELED CIPSOv4
[    0.094308] NetLabel:  unlabeled traffic allowed by default
[    0.095514] Xen: Initializing Xen DMA ops
[    0.102618] pnp: PnP ACPI: disabled
[    0.105773] NET: Registered protocol family 2
[    0.106514] IP route cache hash table entries: 2048 (order: 2, 16384 bytes)
[    0.108734] TCP established hash table entries: 8192 (order: 5, 131072 bytes)
[    0.108789] TCP bind hash table entries: 8192 (order: 5, 131072 bytes)
[    0.108838] TCP: Hash tables configured (established 8192 bind 8192)
[    0.108856] TCP reno registered
[    0.109250] NET: Registered protocol family 1
[    0.109509] kvm: no hardware support
[    0.109526] has_svm: not amd
[    0.109540] kvm: no hardware support
[    0.110475] platform rtc_cmos: registered platform RTC device (no PNP device found)
[    0.112363] microcode: no support for this CPU vendor
[    0.112380] Scanning for low memory corruption every 60 seconds
[    0.113522] audit: initializing netlink socket (disabled)
[    0.113556] type=2000 audit(1273138381.153:1): initialized
[    0.121304] HugeTLB registered 2 MB page size, pre-allocated 0 pages
[    0.135309] VFS: Disk quotas dquot_6.5.2
[    0.135940] Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
[    0.140484] msgmni has been set to 479
[    0.143426] alg: No test for stdrng (krng)
[    0.143926] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 252)
[    0.143945] io scheduler noop registered
[    0.143961] io scheduler anticipatory registered
[    0.143977] io scheduler deadline registered
[    0.144069] io scheduler cfq registered (default)
[    0.144628] pci_hotplug: PCI Hot Plug PCI Core version: 0.5
[    0.145810] Event-channel device installed.
[    0.149759] blktap_device_init: blktap device major 253
[    0.149789] blktap_ring_init: blktap ring major: 251
[    0.150934] registering netback
[    0.168794] Non-volatile memory driver v1.3
[    0.168866] Linux agpgart interface v0.103
[    0.169333] [drm] Initialized drm 1.1.0 20060810
[    0.169401] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[    0.180637] brd: module loaded
[    0.185368] loop: module loaded
[    0.189598] input: Macintosh mouse button emulation as /devices/virtual/input/input0
[    0.193358] blkfront: xvda1: barriers enabled
[    0.193982] Intel(R) PRO/1000 Network Driver - version 7.3.21-k3-NAPI
[    0.193998] Copyright (c) 1999-2006 Intel Corporation.
[    0.194555] e1000e: Intel(R) PRO/1000 Network Driver - 1.0.2-k2
[    0.194571] e1000e: Copyright (c) 1999-2008 Intel Corporation.
[    0.195266] e100: Intel(R) PRO/100 Network Driver, 3.5.24-k2-NAPI
[    0.195282] e100: Copyright(c) 1999-2006 Intel Corporation
[    0.195831] sky2 driver version 1.23
[    0.196280] Initialising Xen virtual ethernet driver.
[    0.201323] console [netcon0] enabled
[    0.201344] netconsole: network logging started
[    0.201358] Fusion MPT base driver 3.04.10
[    0.201372] Copyright (c) 1999-2008 LSI Corporation
[    0.201432] Fusion MPT FC Host driver 3.04.10
[    0.201696] Fusion MPT misc device (ioctl) driver 3.04.10
[    0.201899] mptctl: Registered with Fusion MPT base driver
[    0.201914] mptctl: /dev/mptctl @ (major,minor=10,220)
[    0.203170] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    0.203418] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    0.295160] uhci_hcd: USB Universal Host Controller Interface driver
[    0.295933] usbcore: registered new interface driver usblp
[    0.295954] Initializing USB Mass Storage driver...
[    0.296244] usbcore: registered new interface driver usb-storage
[    0.296264] USB Mass Storage support registered.
[    0.296496] usbcore: registered new interface driver libusual
[    0.297926] PNP: No PS/2 controller found. Probing ports directly.
[    0.298026] i8042.c: No controller found.
[    0.299877] mice: PS/2 mouse device common for all mice
[    0.301396] rtc_cmos rtc_cmos: rtc core: registered rtc_cmos as rtc0
[    0.303704] device-mapper: ioctl: 4.15.0-ioctl (2009-04-01) initialised: dm-devel@redhat.com
[    0.304161] cpuidle: using governor ladder
[    0.304177] cpuidle: using governor menu
[    0.309702] usbcore: registered new interface driver hiddev
[    0.309906] usbcore: registered new interface driver usbhid
[    0.309927] usbhid: v2.6:USB HID core driver
[    0.310264] Advanced Linux Sound Architecture Driver Version 1.0.20.
[    0.312415] ALSA device list:
[    0.312431]   No soundcards found.
[    0.312609] Netfilter messages via NETLINK v0.30.
[    0.312668] nf_conntrack version 0.5.0 (1996 buckets, 7984 max)
[    0.314101] ctnetlink v0.93: registering with nfnetlink.
[    0.321893] ip_tables: (C) 2000-2006 Netfilter Core Team
[    0.321932] TCP cubic registered
[    0.321947] Initializing XFRM netlink socket
[    0.323115] NET: Registered protocol family 10
[    0.337970] ip6_tables: (C) 2000-2006 Netfilter Core Team
[    0.338464] IPv6 over IPv4 tunneling driver
[    0.347093] NET: Registered protocol family 17
[    0.348923] RPC: Registered udp transport module.
[    0.348940] RPC: Registered tcp transport module.
[    0.349796] registered taskstats version 1
[    0.349846] XENBUS: Device with no driver: device/console/0
[    0.349887]   Magic number: 1:252:3141
[    0.350101] md: Waiting for all devices to be available before autodetect
[    0.350117] md: If you don't use raid, use raid=noautodetect
[    0.350800] md: Autodetecting RAID arrays.
[    0.350815] md: Scanned 0 and added 0 devices.
[    0.350829] md: autorun ...
[    0.350842] md: ... autorun DONE.
[    0.351625] EXT3-fs: INFO: recovery required on readonly filesystem.
[    0.351647] EXT3-fs: write access will be enabled during recovery.
[    0.449953] kjournald starting.  Commit interval 5 seconds
[    0.450065] EXT3-fs: recovery complete.
[    0.450324] EXT3-fs: mounted filesystem with writeback data mode.
[    0.450385] VFS: Mounted root (ext3 filesystem) readonly on device 202:1.
[    0.451126] Freeing unused kernel memory: 572k freed
[    0.451313] Write protecting the kernel read-only data: 8544k
 * Filesystem type 'fusectl' is not supported. Skipping mount.
 * Setting preliminary keymap...                                         [ OK ] 
 * Starting kernel event manager...                                      [ OK ] 
 * Loading hardware drivers...                                           [ OK ] 
 * Loading kernel modules...                                                     * Loading manual drivers...                                                                           [ OK ] 
 * Setting kernel variables (/etc/sysctl.conf)...                        [ OK ] 
 * Setting kernel variables (/etc/sysctl.d/10-console-messages.conf)...  [ OK ] 
 * Setting kernel variables (/etc/sysctl.d/10-network-security.conf)...  [ OK ] 
 * Activating swap...                                                    [ OK ] 
 * Checking file systems...                                                     fsck 1.41.4 (27-Jan-2009)
                                                                         [ OK ]
 * Mounting local filesystems...                                                [mntent]: warning: no final newline at the end of /etc/fstab
                                                                         [ OK ]
 * Activating swapfile swap...                                           [ OK ] 
 * Configuring network interfaces...                                     [ OK ] 
 * Setting up console font and keymap...                                 [ OK ] 
 * Starting system log daemon...                                         [ OK ] 
 * Starting kernel log daemon...                                         [ OK ] 
 * Starting OpenBSD Secure Shell server sshd                             [ OK ] 
 * Restarting OpenBSD Secure Shell server sshd
   ...done.



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