Re: [Xen-devel] Regression in PCI pass-through from qemu-xen changeset "passthrough: Fix older kernel assigned device resume failure problem"

[Simon Horman <horms@xxxxxxxxxxxx>]

On Wed, May 06, 2009 at 12:23:27AM +0800, Cui, Dexuan wrote:
> Ian Jackson wrote:
> > Simon Horman writes ("Re: [Xen-devel] Regression in PCI pass-through
> > from qemu-xen changeset "passthrough: Fix older kernel assigned
> > device resume       failure problem""): On Sat, May 02, 2009 at 12:10:15PM
> > +1000, Simon Horman wrote:  
> >> Changeset "passthrough: Fix older kernel assigned device resume
> >> failure 
> >> problem" (dbb8aafa702b8b4f5568e08641d98471fd04e0f8) in
> >> qemu-xen-unstable.git appears to cause a regression. This changeset
> >> was 
> >> applied between the xen-3.4.0-rc2 and xen-3.4.0-rc3 tags of
> >> qemu-xen-unstable.git.
> > ...
> >> The problem that I am seeing is that with this changeset applied
> >> I am not able to correctly initialise Intel network cards. Though
> >> I assume the problem is not specific to this hardware.
> > 
> > Thanks ...
> > 
> > Cui, Dexuan writes ("[PATCH][ioemu] fix PCI bar mapping"):
> >> dbb8aafa702b8b4f5568e08641d98471fd04e0f8 has a bug:
> >> The virtual CMD value we get from reg_entry->data is not the proper
> >> value because reg_entry->data only holds the emulated bits and the
> >> PCI_COMMAND_IO/PCI_COMMAND_MEMORY bits are not in it. Instead, we
> >> can use pt_pci_read_config(&ptdev->dev, PCI_COMMAND, 2) to get the
> >> proper value.   
> > 
> > ... Cui, do you think this is likely to fix Simon's problem ?
> Yes, I think this should fix Simon's problem since actually I meet with the 
> same symptom and I made the patch to fix it.

Hi,

I did some testing this morning and Dexuan's patch appears
to solve the problem that I was seeing.

Thanks

-- 
Simon Horman
  VA Linux Systems Japan K.K. Satellite Lab in Sydney, Australia
  H: www.vergenet.net/~horms/            W: www.valinux.co.jp/en


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