Re: [Xen-users] PCI Passthrough of iwlwifi adapter into Windows HVM failed to start

[sm8ax1@xxxxxxxxxxx]

Quoting "John Mok" <a9121431@xxxxxxxxx>:

> > From what I understand, some devices can't be reinitialized (and  
> > won't work) by the DomU driver after they've already been  
> > initialized on >the Dom0. Blacklisting the module should prevent it  
> > from being initialized before being passed through to the DomU.
> The driver iwlwifi was compiled as a module and I can see it using
> lsmod. The module has been preceeded by the xen-pciback, such that the
> xen-pciback is loaded first, and I use the command, xl
> pci-assignable-list, and the WiFi PCI device, i.e. 0030:00.0, appears.
Even if xen-pciback is loaded first, iwlwifi is probably still binding  
to and initializing the card until pci-assignable-add rebinds it to  
xen-pciback. The problem being that iwlwifi might not properly  
de-initialize the card when it is unloaded. You can check what driver  
is currently bound to the card with `lspci -v`. If you blacklist  
iwlwifi on the Dom0, the card's state should be unmodified when it is  
passed to the DomU. It's a long shot, but it might be worth trying.
Also, have you tried passing the card to a Linux HVM? At this point,  
we don't know if the problem is with the Windows equivalent of  
xen-pcifront (or the emulated PCI bus; I'm not sure how PCI  
passthrough works on HVMs exactly), or the hypervisor or xen-pciback.  
Trying some different DomUs might help us identify a pattern.
> > If that doesn't work, it's worth reading this page in full:  
> > http://wiki.xenproject.org/wiki/Xen_PCI_Passthrough and mentioning  
> > your distro, >Xen version, and hardware (e.g. whether you have an  
> > IOMMU or not).
> In Xen 4.0.x, I succeeded to pass through LSI SAS controller to
> Windows HVM. I had read through
> http://wiki.xenproject.org/wiki/Xen_PCI_Passthrough, and the hardware
> ThinkPad x250 has VT-d support in BIOS.
>
> Any idea why the driver in Windows HVM could not start?
>
> Thanks a lot.
>
> John Mok

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