Re: [Xen-users] BUG? domU reboot fails when using "pci =" option

[list user <xktnniuymlla@xxxxxxxxxxxxxx>]

Ryan wrote:
> On Thu, 2006-05-04 at 16:04 -0700, list user wrote:
>
> > Thanks Ryan,
> >
> > I tried the fix but it just gave a different symptom.  (same error, 
> > different variable)
>
> Can you post the exact error message you're getting?
>
>
> > So... rpm --erase xen JIC there were any ghosts around.  Manually 
> > removed all traces of xen from the system.  Then did a ./install.sh from 
> >  the xen-3.0.2-2 directory, which had a clean "make world".
> > The results are the same.
> >
> > I've found a more generic error about a local variable being used before 
> > assignment, but I think it's referring to dev_config.
> > Again, this only happens on auto-boot or domU reboot, and only when 
> > there is a "pci =" line in the domU's definition file.
> > Any ideas how I can help debug this?
>
> Can you post the output of /var/log/xend.log? If your file is large,
> please don't attach the whole thing! :) Specifically, I'm interested in
> any errors in the file and the debug lines that contains the words
> "XendDomainInfo.create" followed by some information in lots of square
> brackets. Also take a look at the kernel log in dom0 (type 'dmesg') and
> look for any strange errors.
I've found an area in the log that _may_ show where the problem arises.

Let me give a refresher.  There are
   1 pci slot: 00:0d.0
   2 vif's on 2 bridges: LAN, DMZ
   3 vbd's: hda1, hda2, hda3

On a boot the following devices are created in this order:
   hda1, hda2, hda3, pci, LAN, DMZ

On a reboot the following devices are created in this order:
   LAN, DMZ, hda1, hda2, hda3

Note that the pci device is _not_ recreated on a reboot.

The following excerpt from xend.log shows the pci creation in a 
successful boot.  This code never happens in a failed reboot.
[2006-05-05 11:31:27 xend] DEBUG (pciif:129) pci: enabling ioport 
0xd400/0x100
[2006-05-05 11:31:27 xend] DEBUG (pciif:142) pci: enabling iomem 
0xcffffd00/0x100 pfn 0xcffff/0x1
[2006-05-05 11:31:27 xend] DEBUG (pciif:142) pci: enabling iomem 
0xcffc0000/0x20000 pfn 0xcffc0/0x20
[2006-05-05 11:31:27 xend] DEBUG (pciif:153) pci: enabling irq 5
[2006-05-05 11:31:27 xend] DEBUG (DevController:103) DevController: 
writing {'state': '1', 'backend-id': '0', 'backend': 
'/local/domain/0/backend/pci/3/0'} to /local/domain/3/device/pci/0.
[2006-05-05 11:31:27 xend] DEBUG (DevController:105) DevController: 
writing {'domain': 'vm1', 'frontend': '/local/domain/3/device/pci/0', 
'frontend-id': '3', 'dev-0': '0000:00:0d.00', 'state': '1', 'num_devs': 
'1'} to /local/domain/0/backend/pci/3/0.
Will keep digging....


> Is the pci device appearing correctly in your domU? Do you see any
> strange error messages or warnings in your domU before you try and
> reboot it?
>
> Ryan
>
>
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