hv_msi_free(9)

💅 hv_msi_free — a Kernel API Manual moment 💅

ok so bestie, we're in the Kernel API Manual today and honestly this one is short and sweet — let's get into it ✨

---

🌸 NAME 🌸

hv_msi_free — literally just frees the MSI. that's the whole vibe. 💖

---

🦋 SYNOPSIS 🦋

void hv_msi_free (struct irq_domain *domain , unsigned int irq );

two args, no return, void royalty 👑

---

🎀 ARGUMENTS 🎀

• domain — the interrupt domain pointer, iykyk 💫
• irq — this one identifies the IRQ. it's giving "which one" energy 🔍

---

💜 DESCRIPTION 💜

okay so picture this: the Hyper-V parent partition and the hypervisor are both out here tracking the messages that are in use, keeping that interrupt redirection table up to date — like a shared notes app but for interrupts, no cap 📝✨

this callback? it sends a message that frees the IRT entry plus all the related tracking nonsense that comes with it. bye bye bookkeeping 🫶

---

👑 SEE ALSO 👑

the whole hyperv pci squad, all linked up 🧚:

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_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)

like yes that's a lot of friends but they're all iconic, we don't skip any 💀💖

---

and that's the page!! brought to you from ./drivers/pci/controller, October 2026 edition — mwah, go touch some interrupts 🍓