[Xen-devel] Re: [PATCH 0/2] passthrough: make management of PCI D-states by guest optional

[Yuji Shimada <shimada-yxb@xxxxxxxxxxxxxxx>]

On Fri, 6 Mar 2009 14:23:20 +0900
Kouya Shimura <kouya@xxxxxxxxxxxxxx> wrote:

> Hi,
> 
> Using D3hot state of PCI devices in xen is not mature yet.
> I met domain destruction/creation troubles in some PCI cards since the
> PCI config registers can't be read with D3hot state. xend.log is attached.
> 
> This patch set makes the management of PCI D-states by guest optional.
> 
> The default is "pci_power_mgmt=0" which disables the guest OS from
> managing D-states because it would be better to avoid the trouble than
> advantage of low power consumption.
> 
> Thanks,
> Kouya
> 
> From xend.log:
> 
> [2009-03-04 09:49:24 4356] ERROR (XendDomainInfo:2584) 
> XendDomainInfo.destroy: domain destruction failed.
> Traceback (most recent call last):
>   File "/usr/lib64/python/xen/xend/XendDomainInfo.py", line 2578, in destroy
>     do_FLR(self.domid)
>   File "/usr/lib64/python/xen/xend/XendDomainInfo.py", line 314, in do_FLR
>     raise VmError("pci: failed to locate device and "+
> VmError: pci: failed to locate device and parse it's resources - ord() 
> expected a character, but string of length 0 found
> ...[snip]...
> [2009-03-04 10:31:24 4343] ERROR (XendDomainInfo:2445) 
> XendDomainInfo.initDomain: exception occurred
> Traceback (most recent call last):
>   File "/usr/lib64/python/xen/xend/XendDomainInfo.py", line 2437, in 
> _initDomain
>     self._createDevices()
>   File "/usr/lib64/python/xen/xend/XendDomainInfo.py", line 2049, in 
> _createDevices
>     devid = self._createDevice(devclass, config)
>   File "/usr/lib64/python/xen/xend/XendDomainInfo.py", line 2016, in 
> _createDevice
>     return self.getDeviceController(deviceClass).createDevice(devConfig)
>   File "/usr/lib64/python/xen/xend/server/DevController.py", line 67, in 
> createDevice
>     self.setupDevice(config)
>   File "/usr/lib64/python/xen/xend/server/pciif.py", line 399, in setupDevice
>     raise VmError("pci: failed to locate device and "+
> VmError: pci: failed to locate device and parse it's resources - ord() 
> expected a character, but string of length 0 found

Hi, Shimura-san

In my environment, I can't draw above error.

So could you test the following patches?

http://lists.xensource.com/archives/html/xen-devel/2009-04/msg00829.html

I think your D-state problem is resolved with these patches.

Thanks,
--
Yuji Shimada


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