Re: [PATCH 0/7] Enable Qualcomm WiFi PCIe passthrough to VMs

[Jose Ignacio Tornos Martinez <jtornosm@redhat.com>]

Hi Jason,

I understand the concern about compatibility implications, but to
clarify, my intention is not to create an ABI or a "MSI caching
concept". It is simply passing the necessary information from the
host driver to the VM driver so the device can work. The mechanism
uses the existing VFIO variant driver pattern, but I'm open to any
other mechanism that achieves the same goal.

I can explore converting ath11k/ath12k to
platform_device_msi_init_and_alloc_irqs(). However, if I understood
correctly, the VM problem remains identical after that change — the
firmware still needs physical host addresses, and device MSI domains
in the VM would still provide virtual ones.

I'm happy to do this refactoring if it opens a path to get these
devices working in VMs. What VM mechanism would you accept for
exposing physical MSI values through device MSI domains?

Jeff is escalating to Qualcomm engineering again (thank you for
that), but users with deployed hardware need something working in
a reasonable timeframe.

Thanks

Best regards
Jose Ignacio