hv_pci_query_relations(9)

💖 NAME 💖

hv_pci_query_relations — ask the host to send the list of child devices 💅✨

Okay bestie, welcome to the hv_pci_query_relations(9) page from the Kernel API Manual 🫶. This function is literally about asking the host to send over the list of child devices, and honestly? iconic behavior. 👑

🌸 SYNOPSIS 🌸

int hv_pci_query_relations (struct hv_device *hdev );

🎀 ARGUMENTS 🎀

• hdev — VMBus's tracking struct for this root PCI bus. Think of it as the root PCI bus's little ID bracelet at the VMBus party 🪩

⭐ RETURN ⭐

• 0 — success, slay ✅
• -errno — failure, and it comes back as -errno 😭

🦋 SEE ALSO 🦋

The kernel file ./drivers/pci/controller/pci-hyperv.c is the main-character file, and these related pages are all in the group chat too:

• 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)
• hv_pcie_init_irq_domain(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_send_resources_allocated(9)
• hv_send_resources_released(9)
• hv_pci_probe(9)
• hv_pci_remove(9)

okay that’s the whole page, bestie 💖 mwah! This glow-up is brought to you by the source/version slot ./drivers/pci/controller, dated October 2026 — and yes, we are still serving hv_pci_query_relations(9) realness ✨👑