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

[sm8ax1@xxxxxxxxxxx]

Quoting "John Mok" <a9121431@xxxxxxxxx>:

> > Just to confirm, are you certain that the driver in question really  
> > does work when it is running on baremetal ....?
> Yes, the driver works on baremetal, but not try on other
> virtualization passthrough.
>
> > I'm just guessing here, but does dmesg/journalctl have anything to  
> > say on the Dom0 side? In particular, an error about the driver  
> > >attempting to write to read-only configuration space could  
> > indicate that you need the "permissive=1" flag. See  
> > http://wiki.xenproject.org/wiki/Xen_PCI_Passthrough#PV_guests_and_PCI_quirks
> I do not see anything complaining driver failing to write to read-only
> configuration space. But somehow the Windows 7 HVM guest could not
> bring up the Intel AC 7265 driver with error code 10 (fail to start).
>
> As the driver could run on baremetal, it should be a Xen PCI
> passthrough problem.
>
> I hope someone could advise how to solve the problem, or point me to
> the right direction.
>
> Thanks a lot.
>
> John Mok
My mistake, the "permissive" flag only applies to PV guests.

Once again I'm just guessing, but you could try blacklisting the  
module (iwlwifi) for the adapter on the Dom0. Make sure `lsmod | grep  
iwlwifi` outputs something, just to make sure that module isn't built  
into the kernel, then run `echo blacklist iwlwifi >>  
/etc/modprobe.d/blacklist` and reboot. Check your distro's  
documentation for blacklisting modules if that doesn't work.
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.
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).

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