Yes, it works now. But qemu upstream blkback performance is unacceptable slow 
during F14 PV DomU install :-

name="VF14"
memory=2048
disk = ['file:/usr/tmp/disk.img,xvda,w',]
vif = [ 'bridge=br0' ]
kernel = "/home/boris/fedora/vmlinuz"
ramdisk = "/home/boris/fedora/initrd.img"
vcpus=2
on_reboot = 'restart'
on_crash = 'restart'
# xl create -c f14.install
Parsing config file f14.install
Daemon running with PID 3589
                            [    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Linux version 2.6.35.6-45.fc14.x86_64 
(mockbu...@x86-02.phx2.fedoraproject.org) (gcc version 4.5.1 20100924 (Red Hat 
4.5.1-4) (GCC) ) #1 SMP Mon Oct 18 23:57:44 UTC 2010
[    0.000000] Command line: 
[    0.000000] ACPI in unprivileged domain disabled
[    0.000000] BIOS-provided physical RAM map:
[    0.000000]  Xen: 0000000000000000 - 00000000000a0000 (usable)
[    0.000000]  Xen: 00000000000a0000 - 0000000000100000 (reserved)
[    0.000000]  Xen: 0000000000100000 - 0000000080000000 (usable)
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] DMI not present or invalid.
[    0.000000] No AGP bridge found
[    0.000000] last_pfn = 0x80000 max_arch_pfn = 0x400000000
[    0.000000] init_memory_mapping: 0000000000000000-0000000080000000
[    0.000000] RAMDISK: 01e63000 - 058c0000
[    0.000000] No NUMA configuration found
[    0.000000] Faking a node at 0000000000000000-0000000080000000
[    0.000000] Initmem setup node 0 0000000000000000-0000000080000000
[    0.000000]   NODE_DATA [0000000001e42880 - 0000000001e5687f]
[    0.000000]   bootmap [0000000005cf6000 -  0000000005d05fff] pages 10
[    0.000000] (9/32 early reservations) ==> bootmem [0000000000 - 0080000000]
[    0.000000]   #0 [0005cc3000 - 0005cf6000]   XEN PAGETABLES ==> [0005cc3000 
- 0005cf6000]
[    0.000000]   #1 [0001000000 - 0001e42878]    TEXT DATA BSS ==> [0001000000 
- 0001e42878]
[    0.000000]   #2 [0001e63000 - 00058c0000]          RAMDISK ==> [0001e63000 
- 00058c0000]
[    0.000000]   #3 [00058c0000 - 0005cc3000]   XEN START INFO ==> [00058c0000 
- 0005cc3000]
[    0.000000]   #4 [0000001000 - 0000003000]       TRAMPOLINE ==> [0000001000 
- 0000003000]
[    0.000000]   #5 [0000003000 - 0000007000]      ACPI WAKEUP ==> [0000003000 
- 0000007000]
[    0.000000]   #6 [0000100000 - 00004cd000]          PGTABLE ==> [0000100000 
- 00004cd000]
[    0.000000]   #7 [0001e42880 - 0001e56880]        NODE_DATA ==> [0001e42880 
- 0001e56880]
[    0.000000]   #8 [0005cf6000 - 0005d06000]          BOOTMAP ==> [0005cf6000 
- 0005d06000]
[    0.000000] Zone PFN ranges:
[    0.000000]   DMA      0x00000001 -> 0x00001000
[    0.000000]   DMA32    0x00001000 -> 0x00100000
[    0.000000]   Normal   empty
[    0.000000] Movable zone start PFN for each node
[    0.000000] early_node_map[2] active PFN ranges
[    0.000000]     0: 0x00000001 -> 0x000000a0
[    0.000000]     0: 0x00000100 -> 0x00080000
[    0.000000] SFI: Simple Firmware Interface v0.81 http://simplefirmware.org
[    0.000000] SMP: Allowing 2 CPUs, 0 hotplug CPUs
[    0.000000] No local APIC present
[    0.000000] APIC: disable apic facility
[    0.000000] APIC: switched to apic NOOP
[    0.000000] PM: Registered nosave memory: 00000000000a0000 - 0000000000100000
[    0.000000] Allocating PCI resources starting at 80000000 (gap: 
80000000:80000000)
[    0.000000] Booting paravirtualized kernel on Xen
[    0.000000] Xen version: 4.1.0-rc3-pre (preserve-AD)
[    0.000000] setup_percpu: NR_CPUS:256 nr_cpumask_bits:256 nr_cpu_ids:2 
nr_node_ids:1
[    0.000000] PERCPU: Embedded 30 pages/cpu @ffff880005d3c000 s90496 r8192 
d24192 u122880
[    0.000000] pcpu-alloc: s90496 r8192 d24192 u122880 alloc=30*4096
[    0.000000] pcpu-alloc: [0] 0 [0] 1 
[    0.000000] Xen: using vcpu_info placement
[    0.000000] Built 1 zonelists in Node order, mobility grouping on.  Total 
pages: 516044
[    0.000000] Policy zone: DMA32
[    0.000000] Kernel command line: 
[    0.000000] PID hash table entries: 4096 (order: 3, 32768 bytes)
[    0.000000] Checking aperture...
[    0.000000] No AGP bridge found
[    0.000000] Memory: 1984848k/2097152k available (4548k kernel code, 388k 
absent, 111916k reserved, 7261k data, 944k init)
[    0.000000] SLUB: Genslabs=14, HWalign=64, Order=0-3, MinObjects=0, CPUs=2, 
Nodes=1
[    0.000000] Hierarchical RCU implementation.
[    0.000000]     RCU dyntick-idle grace-period acceleration is enabled.
[    0.000000]     RCU-based detection of stalled CPUs is disabled.
[    0.000000]     Verbose stalled-CPUs detection is disabled.
[    0.000000] NR_IRQS:16640 nr_irqs:288
[    0.000000] Console: colour dummy device 80x25
[    0.000000] console [tty0] enabled
[    0.000000] console [hvc0] enabled
[    0.000000] allocated 20971520 bytes of page_cgroup
[    0.000000] please try 'cgroup_disable=memory' option if you don't want 
memory cgroups
[    0.000000] installing Xen timer for CPU 0
[    0.000000] Detected 2833.038 MHz processor.
[    0.000999] Calibrating delay loop (skipped), value calculated using timer 
frequency.. 5666.07 BogoMIPS (lpj=2833038)
[    0.000999] pid_max: default: 32768 minimum: 301
[    0.000999] Security Framework initialized
[    0.000999] SELinux:  Initializing.
[    0.000999] Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes)
[    0.001629] Inode-cache hash table entries: 131072 (order: 8, 1048576 bytes)
[    0.001999] Mount-cache hash table entries: 256
[    0.002130] Initializing cgroup subsys ns
[    0.002146] Initializing cgroup subsys cpuacct
[    0.002154] Initializing cgroup subsys memory
[    0.002176] Initializing cgroup subsys devices
[    0.002183] Initializing cgroup subsys freezer
[    0.002190] Initializing cgroup subsys net_cls
[    0.002196] Initializing cgroup subsys blkio
[    0.002259] CPU: Unsupported number of siblings 4
[    0.002270] Performance Events: unsupported p6 CPU model 23 no PMU driver, 
software events only.
[    0.002322] SMP alternatives: switching to UP code
[    0.003999] ftrace: converting mcount calls to 0f 1f 44 00 00
[    0.003999] ftrace: allocating 23839 entries in 94 pages
[    0.004359] installing Xen timer for CPU 1
[    0.004410] SMP alternatives: switching to SMP code
[    0.000999] CPU: Unsupported number of siblings 4
[    0.005138] Brought up 2 CPUs
[    0.005294] devtmpfs: initialized
[    0.010269] atomic64 test passed for x86-64 platform with CX8 and with SSE
[    0.010293] Grant table initialized
[    0.029274] Time: 165:165:165  Date: 165/165/65
[    0.029320] NET: Registered protocol family 16
[    0.030085] PCI: Fatal: No config space access function found
[    0.031569] bio: create slab <bio-0> at 0
[    0.032055] ACPI: Interpreter disabled.
[    0.032079] xen_balloon: Initialising balloon driver.
[    0.033116] vgaarb: loaded
[    0.033255] SCSI subsystem initialized
[    0.033295] usbcore: registered new interface driver usbfs
[    0.033295] usbcore: registered new interface driver hub
[    0.033295] usbcore: registered new device driver usb
[    0.033295] PCI: System does not support PCI
[    0.033295] PCI: System does not support PCI
[    0.033295] NetLabel: Initializing
[    0.033295] NetLabel:  domain hash size = 128
[    0.033295] NetLabel:  protocols = UNLABELED CIPSOv4
[    0.033295] NetLabel:  unlabeled traffic allowed by default
[    0.033295] Switching to clocksource xen
[    0.047306] pnp: PnP ACPI: disabled
[    0.049218] NET: Registered protocol family 2
[    0.049381] IP route cache hash table entries: 65536 (order: 7, 524288 bytes)
[    0.050516] TCP established hash table entries: 262144 (order: 10, 4194304 
bytes)
[    0.051974] TCP bind hash table entries: 65536 (order: 8, 1048576 bytes)
[    0.052327] TCP: Hash tables configured (established 262144 bind 65536)
[    0.052341] TCP reno registered
[    0.052357] UDP hash table entries: 1024 (order: 3, 32768 bytes)
[    0.052384] UDP-Lite hash table entries: 1024 (order: 3, 32768 bytes)
[    0.052485] NET: Registered protocol family 1
[    0.052576] Trying to unpack rootfs image as initramfs...
[    0.131692] Freeing initrd memory: 59764k freed
[    0.152319] platform rtc_cmos: registered platform RTC device (no PNP device 
found)
[    0.152797] audit: initializing netlink socket (disabled)
[    0.152830] type=2000 audit(1296761357.631:1): initialized
[    0.161815] HugeTLB registered 2 MB page size, pre-allocated 0 pages
[    0.163569] VFS: Disk quotas dquot_6.5.2
[    0.163623] Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
[    0.164137] msgmni has been set to 3993
[    0.164711] alg: No test for stdrng (krng)
[    0.164778] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 
253)
[    0.164789] io scheduler noop registered
[    0.164794] io scheduler deadline registered
[    0.164835] io scheduler cfq registered (default)
[    0.164990] pci_hotplug: PCI Hot Plug PCI Core version: 0.5
[    0.165024] pciehp: PCI Express Hot Plug Controller Driver version: 0.4
[    0.165031] acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5
[    0.165047] pci-stub: invalid id string ""
[    0.165575] Non-volatile memory driver v1.3
[    0.165588] Linux agpgart interface v0.103
[    0.165641] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[    0.167071] brd: module loaded
[    0.167711] loop: module loaded
[    0.167838] Fixed MDIO Bus: probed
[    0.167896] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    0.167920] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    0.167939] uhci_hcd: USB Universal Host Controller Interface driver
[    0.167991] PNP: No PS/2 controller found. Probing ports directly.
[    0.168888] mice: PS/2 mouse device common for all mice
[    0.169024] rtc_cmos: probe of rtc_cmos failed with error -16
[    0.169105] device-mapper: uevent: version 1.0.3
[    0.169239] device-mapper: ioctl: 4.19.1-ioctl (2010-10-12) initialised: 
dm-de...@redhat.com
[    0.169370] cpuidle: using governor ladder
[    0.169377] cpuidle: using governor menu
[    0.169621] usbcore: registered new interface driver hiddev
[    0.169642] usbcore: registered new interface driver usbhid
[    0.169648] usbhid: USB HID core driver
[    0.169669] nf_conntrack version 0.5.0 (16384 buckets, 65536 max)
[    0.169789] CONFIG_NF_CT_ACCT is deprecated and will be removed soon. Please 
use
[    0.169803] nf_conntrack.acct=1 kernel parameter, acct=1 nf_conntrack module 
option or
[    0.169812] sysctl net.netfilter.nf_conntrack_acct=1 to enable it.
[    0.169876] ip_tables: (C) 2000-2006 Netfilter Core Team
[    0.169895] TCP cubic registered
[    0.169900] Initializing XFRM netlink socket
[    0.169911] NET: Registered protocol family 17
[    0.170037] registered taskstats version 1
[    0.170057] XENBUS: Device with no driver: device/vbd/51712
[    0.170064] XENBUS: Device with no driver: device/vif/0
[    0.170079]   Magic number: 1:252:3141
[    0.170100] drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
[    0.170118] Initalizing network drop monitor service
[    0.170278] Freeing unused kernel memory: 944k freed
[    0.170608] Write protecting the kernel read-only data: 10240k
[    0.175431] Freeing unused kernel memory: 1576k freed
[    0.176545] Freeing unused kernel memory: 1836k freed
[9;0][8]
Greetings.
anaconda installer init version 14.22 starting
mounting /proc filesystem... done

(process:1): GLib-CRITICAL **: g_hash_table_lookup_extended: assertion 
`hash_table != NULL' failed
creating /dev filesystem... done
starting udev...done
mounting /dev/pts (unix98 pty) filesystem... done
mounting /sys filesystem... done

(process:1): GLib-CRITICAL **: g_hash_table_lookup_extended: assertion 
`hash_table != NULL' failed
anaconda installer init version 14.22 using /dev/hvc0 as console
trying to remount root filesystem read write... done
mounting /tmp as tmpfs... done

(process:1): GLib-CRITICAL **: g_hash_table_lookup_extended: assertion 
`hash_table != NULL' failed
running install...
running /sbin/loader
detecting hardware...
waiting for hardware to initialize...
detecting hardware...
waiting for hardware to initialize...

Welcome to Fedora for x86_64

Running anaconda 14.22, the Fedora system installer - please wait.

               ┌─────────────┤ VNC Configuration ├──────────────┐
               │                                                │
               │ A password will prevent unauthorized listeners │
               │ connecting and monitoring your installation    │
               │ progress.  Please enter a password to be used  │
               │ for the installation                           │
               │                                                │
               │      Password:           ________________      │
               │      Password (confirm): ________________      │
               │                                                │
               │                                                │
               │   ┌────┐      ┌─────────────┐     ┌──────┐     │
               │   │ OK │      │ No password │     │ Back │     │
               │   └────┘      └─────────────┘     └──────┘     │
               │                                                │
               │                                                │
               └────────────────────────────────────────────────┘



19:30:25 Starting VNC...
19:30:36 The VNC server is now running.
19:30:36 

WARNING!!! VNC server running with NO PASSWORD!
You can use the vncpassword=<password> boot option
if you would like to secure the server.


19:30:36 Please manually connect your vnc client to 192.168.0.104:1 to begin 
the install.
19:30:37 Starting graphical installation.


Boris.



--- On Wed, 2/2/11, M A Young <m.a.yo...@durham.ac.uk> wrote:

From: M A Young <m.a.yo...@durham.ac.uk>
Subject: [Fedora-xen] rc3 kernel and xen
To: xen@lists.fedoraproject.org
Date: Wednesday, February 2, 2011, 5:43 PM

I have builds of a new dom0 kernel (2.6.38-0.rc3.git0.1.xendom0.fc15) at
http://koji.fedoraproject.org/koji/taskinfo?taskID=2755802 and xen 
(4.1.0-0.1.rc3.fc14) at 
http://koji.fedoraproject.org/koji/taskinfo?taskID=2753907

You may need one or both of the following hacks

Edit /etc/init.d/xenstored replacing the line
XENSTORED_PID="/var/run/xenstore.pid"
with
XENSTORED_PID="/var/run/xenstored.pid"
(I didn't notice they had changed the name of this file until after I 
tested the xen packages)

Edit /etc/sysconfig/modules/xen.modules to remove xen-netback from the 
list of modules in the for loop then add
modprobe xen-netback netback_kthread=1
to the end of the file. The xen-netback module in xen/next-2.6.38 when I 
built the kernel still needed some work and setting this value makes it 
less likely to throw up backtraces if you try to use it.

     Michael Young
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