Re: ath11k and vfio-pci support

[James Prestwood <prestwoj@gmail.com>]

Hi Kalle,

On 1/10/24 1:00 AM, Kalle Valo wrote:
> + ath11k list
>
> James Prestwood <prestwoj@gmail.com> 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@gmail.com/

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