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Re: ath11k and vfio-pci support

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Hi Kalle,

On 1/10/24 1:00 AM, Kalle Valo wrote:
+ ath11k list

James Prestwood <prestwoj@xxxxxxxxx> writes:

For a while now I've been using vfio-pci to pass through wireless
hardware to a Qemu VM. This makes testing kernel changes quick and
easy compared to swapping the host kernel for reach iterative change.
So far I've had very few issues doing this, maybe I've just been
lucky... I tried doing this with an ath11k (WCN6855) card and ran into
issues with the driver starting up. I'm wondering if its a
configuration issue or just a lack of support by ath11k? The card
works just fine when I use it on my host machine. Based on the logs it
may not even be related to ath11k as wmi-bmof seems to fail first, but
I'm not familiar with anything at the PCI level so I've got no idea
whats going on.
There's a bug report about this:

https://bugzilla.kernel.org/show_bug.cgi?id=216055
Yes I saw that, but apparently didn't read past the first comment... I'm not seeing any of the DMAR faults but the ath-releated ones look the same. Good to know its not just me.

But I have also no idea what is causing this, I guess we are doing
something wrong with the PCI communication? That reminds me, you could
try this in case that helps:

https://patchwork.kernel.org/project/linux-wireless/patch/20231212031914.47339-1-imguzh@xxxxxxxxx/

Heh, I saw this pop up a day after I sent this and was wondering. Is this something I'd need on the host kernel, guest, or both?

Thanks,

James





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