[PATCH RFT] ath11k: pci: support platforms with one MSI vector

[Kalle Valo]

Rama McIntosh <face00 at gmail.com> writes:

> Hi Kalle and Carl,
>
> Nice, I missed this patch.    While my hardware supports multi-vector
> msi and the driver works great on fedora (dell 9700), I run Qubes-os
> and qemu hw/xen currently only supports a single msi vector.   I've
> been looking into fixing qemu to support multi-vector msi...but don't
> have a lot of free time and am still learning how pci and qemu all
> work (should be doable, qemu supports multi vector for msix, just not
> msi).
>
> I applied this patch to the latest Qubes-os 4.1 alpha (kernel
> 5.10.71).      Now instead of the msi initialization error (-28),  I
> get a page fault and kernel panic in my sys-net vm.   I tried
> permissive mode and no-strict-rest mode too, same effect (i.e 'qvm-pci
> attach sys-net-clone-1  dom0:05_00.0 --persistent -o permissive=true
> -o no-strict-reset=true').    However, I'm excited and I will see if I
> can fix this patch to work with xen as soon as I have some time off
> work.

1 MSI vector support is applied now:

https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git/commit/?h=ath-next&id=ac6e73483f7b

The plan is is that it will be in v5.17.

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