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setup_system_domains() clamps "extra_guest_irqs=" against
arch_hwdom_irqs(dom_xen), which is bounded by nr_irqs. That runs before
init_irq_data() computes nr_irqs, so any value above the default is cut to
zero ("domU IRQs bounded to 16") and domUs get only nr_static_irqs PIRQs.
Passing through a device with many MSI-X vectors then fails with -ENOSPC in
map_pirq.
Run the bound check from x86 setup right after init_irq_data() instead.
Signed-off-by: Alex Zenla <alex@edera.dev>
azenla
requested review from
alexandermerritt,
bleggett,
kaniini and
tycho
as code owners
October 10, 2026 14:33
![github-actions[bot]](https://avatars.githubusercontent.com/in/15368?s=60&v=4){kind=small}
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setup_system_domains() clamps "extra_guest_irqs=" against arch_hwdom_irqs(dom_xen), which is bounded by nr_irqs. That runs before init_irq_data() computes nr_irqs, so any value above the default is cut to zero ("domU IRQs bounded to 16") and domUs get only nr_static_irqs PIRQs. Passing through a device with many MSI-X vectors then fails with -ENOSPC in map_pirq.
Run the bound check from x86 setup right after init_irq_data() instead.