Re: [PATCH RFC 04/15] drivers/base: Add support for a new IMS irq domain

Jason Gunthorpe
2020-05-04T12:14:06Z

On Sun, May 03, 2020 at 05:25:28PM -0700, Dey, Megha wrote:
> > > The use case if when we have a device assigned to a guest and we
> > > want to allocate IMS(platform-msi) interrupts for that
> > > guest-assigned device. Currently, this is abstracted through a mdev
> > > interface.
> >
> > And the mdev has the pci_device internally, so it should simply pass
> > that pci_device to the platform_msi machinery.
>
> hmm i am not sure I follow this. mdev has a pci_device internally? which
> struct are you referring to here?

mdev in general may not, but any ADI trying to use mdev will
necessarily have access to a struct pci_device.

> mdev is merely a micropartitioned PCI device right, which no real PCI
> resource backing. I am not how else we can find the IRQ domain associated
> with an mdev..

ADI always has real PCI resource backing.

Jason