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



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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