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

[Jason Gunthorpe]

On Wed, Oct 14, 2026 at 08:46:33PM +0000, Michael Kelley wrote:
> From: Jason Gunthorpe <jgg@xxxxxxxx> Sent: Wednesday, October 14, 2026 8:01 AM
> > 
> > On Tue, Oct 13, 2026 at 05:42:25PM +0200, Jose Ignacio Tornos Martinez wrote:
> > > Thank you for the direction on device MSI domains. The Hyper-V
> > > reference is difficult for me to follow for this case. Could
> > > you point me to some existing KVM/VFIO equivalent, or similar
> > > example for my use case? Any pointers to relevant code,
> > > documentation, or previous discussions on this topic would be
> > > very helpful to get started in the right direction.
> > >
> > > Also, where would this need to be implemented? Kernel only
> > > because it is already supported in QEMU in a general way, or
> > > kernel and QEMU for some specifics?
> > 
> > I spent some time with AI to research this and drafted up some slop
> > for you that outlines a bunch of ideas and explains how some of the
> > bits work today. Not saying this is something to follow but it should
> > be a good starting point to come up with a good idea.
> 
> This is a nice summary of what Hyper-V does. It looks right to me
> based on my experience with that driver (pci-hyperv.c) over the
> years.
> 
> I wrote the documentation in Documentation/virt/hyperv/vpci.rst.
> With your permission, I'd like to adapt some of your material below
> and add it to vpci.rst, primarily to provide some broader context
> on the "why" and the implications of the overall approach. I'm
> not sure how soon that will be, but it will go on my "to do" list.

Sure, no worries do with it as you like!

Jason