Re: [PATCH] hw/xen: pass PCI domain to xc_physdev_map_pirq_msi()

["Edgar E. Iglesias" <edgar.iglesias@xxxxxxxxx>]

On Fri, Oct 17, 2025 at 5:51 PM Roger Pau Monne <roger.pau@xxxxxxxxxx> wrote:

It's currently impossible for passthrough devices on segment different than
0 to work correctly, as the PCI domain is not provided to
xc_physdev_map_pirq_msi(), and hence it's unconditionally assumed that all
devices are on segment 0.

Adjust the call to xc_physdev_map_pirq_msi() to pass the PCI domain in the
high 16bits of the bus parameter.  On versions of Xen where this is not
supported the passed segment will be ignored and assume to be 0, no worse
than the current state.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>

Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xxxxxxx>