Re: [Xen-users] 2.6.18.8 xen.org dom0 kernel w/RHEL 5 PV on HVM guests

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Mon, Mar 22, 2010 at 12:41:14PM -0700, Andrew Evans wrote:
> >>     
> > Do you have a bridge called 'eth0' for real? Try "brctl show" to verify.
> > RHEL5 as a default creates 'xenbr0', not 'eth0'.
> >   
> 
> Well spotted! I don't have such a bridge, and I can't create one because
> eth0 is already an existing network interface name. I've changed my
> libvirt domU config to use xenbr0 instead of eth0. Not sure why this
> works with Xen 3.4.2 though.
>

Xen 3.4.x with the default configuration creates a bridge called 'eth0',
and renames the physical network adapter to peth0.

Xen 3.0.x and 3.1.x with the default configuration creates a bridge called 
'xenbr0',
and renames the physical network adapter to peth0, and also creates a separate
dom0 management only virtual interface called 'eth0'.

So it's just different defaults.
 
> My domU *still* isn't starting, though. xend-debug.log shows this traceback:
> 

Are you sure you got the earlier xen 3.4.x stuff completely removed? 

Did you also make sure virt-manager, libvirt, virsh etc were downgraded 
to the RHEL5 default versions?

Dunno if the xml configuration created with newer libvirt is still compatible 
with the older libvirt/xen..

-- Pasi

> Traceback (most recent call last):
>   File "/usr/lib64/python2.4/SocketServer.py", line 463, in
> process_request_thread
>     self.finish_request(request, client_address)
>   File "/usr/lib64/python2.4/SocketServer.py", line 254, in finish_request
>     self.RequestHandlerClass(request, client_address, self)
>   File "/usr/lib64/python2.4/SocketServer.py", line 521, in __init__
>     self.handle()
>   File "/usr/lib64/python2.4/BaseHTTPServer.py", line 316, in handle
>     self.handle_one_request()
>   File "/usr/lib64/python2.4/BaseHTTPServer.py", line 310, in
> handle_one_request
>     method()
>   File "/usr/lib64/python2.4/site-packages/xen/util/xmlrpclib2.py", line
> 66, in do_POST
>     self.send_response(200)
>   File "/usr/lib64/python2.4/BaseHTTPServer.py", line 367, in send_response
>     self.wfile.write("%s %d %s\r\n" %
>   File "/usr/lib64/python2.4/socket.py", line 256, in write
>     self.flush()
>   File "/usr/lib64/python2.4/socket.py", line 243, in flush
>     self._sock.sendall(buffer)
> error: (32, 'Broken pipe')
> 
> No idea if it's relevant or not. Certainly doesn't look good though.
> 
> xend.log contains everyone's favorite, "Hotplug scripts not working":
> 
> [2010-03-22 19:28:38 xend 4863] ERROR (SrvBase:88) Request
> wait_for_devices failed.
> Traceback (most recent call last):
>   File "/usr/lib64/python2.4/site-packages/xen/web/SrvBase.py", line 85,
> in perform
>     return op_method(op, req)
>   File
> "/usr/lib64/python2.4/site-packages/xen/xend/server/SrvDomain.py", line
> 72, in op_wait_for_devices
>     return self.dom.waitForDevices()
>   File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py",
> line 2330, in waitForDevices
>     self.waitForDevices_(c)
>   File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py",
> line 1422, in waitForDevices_
>     return self.getDeviceController(deviceClass).waitForDevices()
>   File
> "/usr/lib64/python2.4/site-packages/xen/xend/server/DevController.py",
> line 160, in waitForDevices
>     return map(self.waitForDevice, self.deviceIDs())
>   File
> "/usr/lib64/python2.4/site-packages/xen/xend/server/DevController.py",
> line 170, in waitForDevice
>     raise VmError("Device %s (%s) could not be connected. "
> VmError: Device 0 (vif) could not be connected. Hotplug scripts not working.
> 
> Device model log:
> 
> $ cat qemu-dm.16544.log
> domid: 4
> qemu: the number of cpus is 7
> Change xvda to look like hda
> Change xvdb to look like hdb
> Change xvdc to look like hdc
> Watching /local/domain/4/logdirty/next-active
> Watching /local/domain/0/device-model/4/command
> xs_read(): vncpasswd get error.
> /vm/51711672-9512-4bd8-91ea-a1d542bbda92/vncpasswd.
> char device redirected to /dev/pts/1
> qemu_map_cache_init nr_buckets = 10000
> shared page at pfn effff
> buffered io page at pfn efffd
> xs_read(/vm/51711672-9512-4bd8-91ea-a1d542bbda92/rtc/timeoffset): read error
> I/O request not ready: 0, ptr: 0, port: 0, data: 0, count: 0, size: 0
> Triggered log-dirty buffer switch
> I/O request not ready: 0, ptr: 0, port: 0, data: 0, count: 0, size: 0
> I/O request not ready: 0, ptr: 0, port: 0, data: 0, count: 0, size: 0
> I/O request not ready: 0, ptr: 0, port: 0, data: 0, count: 0, size: 0
> I/O request not ready: 0, ptr: 0, port: 0, data: 0, count: 0, size: 0
> I/O request not ready: 0, ptr: 0, port: 0, data: 0, count: 0, size: 0
> I/O request not ready: 0, ptr: 0, port: 0, data: 0, count: 0, size: 0
> 
> Current domU config (libvirt XML):
> 
> <domain type='xen'>
>   <name>foo</name>
>   <memory>7340032</memory>
>   <currentMemory>7340032</currentMemory>
>   <vcpu>7</vcpu>
>   <os>
>     <type arch='x86_64' machine='xenfv'>hvm</type>
>     <loader>/usr/lib/xen/boot/hvmloader</loader>
>     <boot dev='hd'/>
>   </os>
>   <features>
>     <acpi/>
>     <apic/>
>     <pae/>
>   </features>
>   <clock offset='utc'/>
>   <on_poweroff>destroy</on_poweroff>
>   <on_reboot>restart</on_reboot>
>   <on_crash>restart</on_crash>
>   <devices>
>     <emulator>/usr/lib64/xen/bin/qemu-dm</emulator>
>     <disk type='block' device='disk'>
>       <driver name='phy'/>
>       <source dev='/dev/sys/lv0'/>
>       <target dev='xvda' bus='xen'/>
>     </disk>
>     <disk type='block' device='disk'>
>       <driver name='phy'/>
>       <source dev='/dev/sys/lv1'/>
>       <target dev='xvdb' bus='xen'/>
>     </disk>
>     <disk type='block' device='disk'>
>       <driver name='phy'/>
>       <source dev='/dev/sys/lv2'/>
>       <target dev='xvdc' bus='xen'/>
>     </disk>
>     <interface type='bridge'>
>       <mac address='00:50:56:0f:dd:02'/>
>       <source bridge='xenbr0'/>
>       <script path='vif-bridge'/>
>     </interface>
>     <serial type='pty'>
>       <target port='0'/>
>     </serial>
>     <console type='pty'>
>       <target port='0'/>
>     </console>
>     <input type='mouse' bus='ps2'/>
>     <graphics type='vnc' port='-1' autoport='yes'/>
>   </devices>
> </domain>
> 
> thanks,
> 
> -Andrew
> 

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