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[Xen-users] Can not init netfront


I'm a graduate student, trying to run Mini-OS for my project.

When I create mini-os instance, netfront fails to initialize. I get following output from 'xl console <domid>'Â

Xen Minimal OS!
 start_info: 000000000028f000(VA)
  nr_pages: 0x40000
 shared_inf: 0xc05e1000(MA)
  Âpt_base: 0000000000292000(VA)
nr_pt_frames: 0x5
  mfn_list: 000000000008f000(VA)
 Âmod_start: 0x0(VA)
  Âmod_len: 0
   Âflags: 0x0
 stack:   Â000000000004e7a0-000000000006e7a0
MM: Init
   _text: 0000000000000000(VA)
  Â_etext: 00000000000303c2(VA)
 Â_erodata: 0000000000038000(VA)
  Â_edata: 0000000000038540(VA)
stack start: 000000000004e7a0(VA)
   Â_end: 000000000008efa0(VA)
 start_pfn: 29a
  max_pfn: 40000
Mapping memory range 0x400000 - 0x40000000
setting 0000000000000000-0000000000038000 readonly
skipped 0000000000001000
MM: Initialise page allocator for 498000(498000)-40000000(40000000)
MM: done
Demand map pfns at 40001000-2040001000.
Initialising timer interface
Initialising console ... done.
gnttab_table mapped at 0000000040001000.
Initialising scheduler
Thread "Idle": pointer: 0x4a2070, stack: 0x4b0000
Thread "xenstore": pointer: 0x4a20d0, stack: 0x4c0000
xenbus initialised on irq 1 mfn 0xbe5f5
Thread "shutdown": pointer: 0x4a2130, stack: 0x4d0000
Thread "server": pointer: 0x4a2190, stack: 0x4e0000
[server] Waiting for network.
Failed to read device/vif/0/backend-id.
_init_netfront: backend/mac failed

VM's state is 'b' (for blocked) and that's a last line of output before VM gets frozen. My host environment is x86_64ÂCentOS 6.5 with Linux 3.10.34-11 kernel. I configured a bridged network with eth0 and xenbr0 configured as following:



Xen VM configuration file is as follows:

kernel = "/home/knodir/devel/mini-os/mini-os.gz"
builder = 'pvm'
vcpus = 1
memory = 1024
name = "Mini-OS-custom"
serial = 'pty'
on_reboot  = 'destroy'
on_crash  Â= 'destroy'

My custom mini-os kernel is built from https://github.com/cnplab/mini-os since I'm planning to use it for ClickOSÂhttps://github.com/cnplab/clickos I believe this modified Mini-OS to have the same networking source code as an original one (I did not apply xennetÂhttps://github.com/cnplab/xennet patch).

I wonder if I'm missing something in my Xen VM configuration file. When I add a new line vif=[ 'mac=00:16:3e:01:01:01,bridge=xenbr0' ] to it, VM is not created at all. These are the VM creation corresponding lines from /var/log/xen/xend.log

[2014-07-01 14:11:11 20157] DEBUG (XendDomainInfo:151) XendDomainInfo.recreate({'max_vcpu_id': 0, 'cpu_time': 0L, 'ssidref': 0, 'hvm': 0, 'shutdown_reason': 255, 'dying': 0, 'online_vcpus': 1, 'domid': 33, 'paused': 1, 'crashed': 0, 'running': 0, 'maxmem_kb': 1049600L, 'shutdown': 0, 'mem_kb': 1048576L, 'handle': [121, 198, 174, 221, 11, 118, 72, 231, 172, 230, 168, 102, 169, 14, 221, 123], 'blocked': 0, 'cpupool': 0})
[2014-07-01 14:11:11 20157] INFO (XendDomainInfo:169) Recreating domain 33, UUID 79c6aedd-0b76-48e7-ace6-a866a90edd7b. at /local/domain/33
[2014-07-01 14:11:11 20157] DEBUG (XendDomain:476) Adding Domain: 33
[2014-07-01 14:11:11 20157] DEBUG (XendDomainInfo:1882) XendDomainInfo.handleShutdownWatch
[2014-07-01 14:11:11 20157] DEBUG (DevController:95) DevController: writing {'state': '1', 'backend-id': '0', 'backend': '/local/domain/0/backend/console/33/0'} to /local/domain/33/device/console/0.
[2014-07-01 14:11:11 20157] DEBUG (DevController:97) DevController: writing {'domain': 'Mini-OS-custom', 'frontend': '/local/domain/33/device/console/0', 'uuid': '12b56995-0349-8bf3-93ee-92c6a9ec75e7', 'frontend-id': '33', 'state': '1', 'location': '2', 'online': '1', 'protocol': 'vt100'} to /local/domain/0/backend/console/33/0.
[2014-07-01 14:11:11 20157] WARNING (XendDomainInfo:2062) Domain has crashed: name=Mini-OS-custom id=33.
[2014-07-01 14:11:11 20157] ERROR (XendDomainInfo:2196) VM Mini-OS-custom restarting too fast (Elapsed time: 0.400618 seconds). Refusing to restart to avoid loops.
[2014-07-01 14:11:11 20157] DEBUG (XendDomainInfo:3077) XendDomainInfo.destroy: domid=33
[2014-07-01 14:11:12 20157] DEBUG (XendDomainInfo:2402) Destroying device model
[2014-07-01 14:11:12 20157] DEBUG (XendDomainInfo:2409) Releasing devices
[2014-07-01 14:11:12 20157] DEBUG (XendDomainInfo:2407) No device model
[2014-07-01 14:11:12 20157] DEBUG (XendDomainInfo:2409) Releasing devices

Any help is appreciated.


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