hv_irq_retarget_interrupt(9)

💖 hv_irq_retarget_interrupt(9) 💖

okay so this is the Kernel API Manual page for hv_irq_retarget_interrupt, and she is literally here to "Unmask" an IRQ by setting its current affinity. bestie, it's giving kernel-internals main character energy, and we're gonna get through every detail together. 🫶

🌸 NAME 🌸

hv_irq_retarget_interrupt — "Unmask" the IRQ by setting its current affinity. that's the whole name vibe. 💅

✨ SYNOPSIS ✨

void hv_irq_retarget_interrupt (struct irq_data *data );

🎀 ARGUMENTS 🎀

• data — describes the IRQ. she's the descriptor for the IRQ, okay? 🫶

💅 DESCRIPTION 💅

okay so picture this: you build a new destination for the MSI, then you make a hypercall to update the Interrupt Redirection Table. The "Device Logical ID" is built out of this PCI bus's instance GUID and the function number of the device. iconic, honestly. ✨

👑 SEE ALSO 👑

Kernel file ./drivers/pci/controller/pci-hyperv.c is the mothership, and these are the related pages, no skips, no cap:

• struct hv_msi_desc(9)
• struct hv_msi_desc2(9)
• struct tran_int_desc(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_pci_query_relations(9)
• hv_send_resources_allocated(9)
• hv_send_resources_released(9)
• hv_pci_probe(9)
• hv_pci_remove(9)

🎀 byeee bestie: this page is sourced from ./drivers/pci/controller, dated October 2026, and it's literally the hv_irq_retarget_interrupt(9) manual page. mwah 💋