Re: [PATCH v3 3/3] PCI/MSI: Convert pci_msi_ignore_mask to per MSI domain flag

[Thomas Gleixner]

On Tue, Mar 25 2025 at 11:22, Roger Pau Monné wrote:
> On Tue, Mar 25, 2025 at 10:20:43AM +0100, Thomas Gleixner wrote:
> I'm a bit confused by what msi_create_device_irq_domain() does, as it
> does allocate an irq_domain with an associated msi_domain_info
> structure, however that irq_domain is set in
> dev->msi.data->__domains[domid].domain rather than dev->msi.domain,
> and doesn't override the default irq_domain set by
> pcibios_device_add().

The default irq domain is a parent domain in that case on top of which
the per device domains are built. And those are private to the device.

The XEN variant uses the original global PCI/MSI domain concept with
this outrageous domain wrapper hack. A crime committed by some tglx
dude.

> And the default x86 irq_domain (set by pcibios_device_add()) doesn't
> have an associated msi_domain_info.

It does not need one.

Thanks,

        tglx