hv_pcie_init_irq_domain(9)

💖 NAME 💖

okay bestie, welcome to the Kernel API Manual page for hv_pcie_init_irq_domain(9) — and its whole name vibe is Initialize IRQ domain. ✨

🌸 SYNOPSIS 🌸

int hv_pcie_init_irq_domain (struct hv_pcibus_device *hbus );

🎀 ARGUMENTS 🎀

• hbus — the root PCI bus. That's the whole argument, bestie. 👑

🦋 DESCRIPTION 🦋

So this function creates an IRQ domain, and that domain is what gets used for interrupts from devices that have been passed through. 💅

Those devices only support MSI and MSI-X — not line-based interrupts, and not simulations of line-based interrupts through PCIe's fabric-layer messages. Ngl, that part is important. 🫶

And because interrupts are remapped, we can support multi-message MSI here. Slay. 🔥

🫶 RETURN 🫶

The original page has literally no return description text here — not a single word — so I'm not making one up. Periodt. 💀

🌈 SEE ALSO 🌈

The whole linked-up squad, no cap:

• Kernel file: ./drivers/pci/controller/pci-hyperv.c 🧚
• struct hv_msi_desc(9)
• struct hv_msi_desc2(9)
• struct tran_int_desc(9)
• hv_irq_retarget_interrupt(9)
• hv_pci_generic_compl(9)
• devfn_to_wslot(9)
• wslot_to_devfn(9)
• _hv_pcifront_read_config(9)
• _hv_pcifront_write_config(9)
• hv_pcifront_read_config(9)
• hv_pcifront_write_config(9)
• hv_pci_read_config_compl(9)
• hv_read_config_block(9)
• hv_pci_write_config_compl(9)
• hv_write_config_block(9)
• hv_register_block_invalidate(9)
• hv_msi_free(9)
• hv_compose_msi_msg(9)
• get_bar_size(9)
• survey_child_resources(9)
• prepopulate_bars(9)
• create_root_hv_pci_bus(9)
• q_resource_requirements(9)
• new_pcichild_device(9)
• get_pcichild_wslot(9)
• pci_devices_present_work(9)
• hv_pci_start_relations_work(9)
• hv_pci_devices_present(9)
• hv_pci_devices_present2(9)
• hv_eject_device_work(9)
• hv_pci_eject_device(9)
• hv_pci_onchannelcallback(9)
• hv_pci_protocol_negotiation(9)
• hv_pci_free_bridge_windows(9)
• hv_pci_allocate_bridge_windows(9)
• hv_allocate_config_window(9)
• hv_pci_enter_d0(9)
• hv_pci_query_relations(9)
• hv_send_resources_allocated(9)
• hv_send_resources_released(9)
• hv_pci_probe(9)
• hv_pci_remove(9)

okay bye bestie — source/version: ./drivers/pci/controller, date: October 2026, page: hv_pcie_init_irq_domain(9) from the Kernel API Manual. Mwah! 💋✨🎀