iommu_get_resv_regions(9)

okay bestie, welcome to iommu_get_resv_regions from the Kernel API Manual ✨ this one is literally about getting reserved regions, and it's giving “do not touch my IOVA” energy 💅

💖 NAME 💖

iommu_get_resv_regions — get reserved regions. periodt.

✨ SYNOPSIS ✨

void iommu_get_resv_regions (struct device *dev , struct list_head *list
);

🫶 ARGUMENTS 🫶

• dev — the device for which to get reserved regions, bestie. main character device energy.
• list — the reserved region list for device. no cap.

🌸 DESCRIPTION 🌸

okay so, this returns a list of reserved IOVA regions specific to this device. A domain user should not map IOVA in these ranges.

bestie, this is the important part: a domain user should not map IOVA in these ranges. like, do not. 💀

🦋 SEE ALSO 🦋

Kernel file ./drivers/iommu/iommu.c — and here's the whole bestie squad, every single reference, in order:

• iommu_device_register(9)
• iommu_insert_resv_region(9)
• iommu_group_alloc(9)
• iommu_group_get_iommudata(9)
• iommu_group_set_iommudata(9)
• iommu_group_set_name(9)
• iommu_group_add_device(9)
• iommu_group_remove_device(9)
• iommu_group_mutex_assert(9)
• iommu_group_for_each_dev(9)
• iommu_group_get(9)
• iommu_group_ref_get(9)
• iommu_group_put(9)
• iommu_group_id(9)
• device_iommu_capable(9)
• iommu_group_has_isolated_msi(9)
• iommu_set_fault_handler(9)
• iommu_paging_domain_alloc_flags(9)
• iommu_attach_device(9)
• iommu_get_domain_for_dev(9)
• iommu_driver_get_domain_for_dev(9)
• iommu_attach_group(9)
• iommu_unmap(9)
• iommu_unmap_fast(9)
• report_iommu_fault(9)
• iommu_put_resv_regions(9)
• iommu_setup_default_domain(9)
• iommu_device_use_default_domain(9)
• iommu_device_unuse_default_domain(9)
• iommu_group_claim_dma_owner(9)
• iommu_device_claim_dma_owner(9)
• iommu_group_release_dma_owner(9)
• iommu_device_release_dma_owner(9)
• iommu_group_dma_owner_claimed(9)
• iommu_replace_device_pasid(9)
• iommu_attach_handle_get(9)
• iommu_attach_group_handle(9)
• iommu_detach_group_handle(9)
• iommu_replace_group_handle(9)
• pci_dev_reset_iommu_prepare(9)
• pci_dev_reset_iommu_done(9)
• iommu_dma_prepare_msi(9)

xoxo bestie 💖 source/version ./drivers/iommu, date October 2026. that's the cute footer sign-off, and you ate. 🎀