iommu_group_...isolated_msi(9)

iommu_group_...isolated_msi(9) 🦋

okay bestie, welcome to the Kernel API Manual — this one's a tiny lil helper that does a vibe check on an IOMMU group 💅

🌸 NAME 🌸

iommu_group_has_isolated_msi — compute msi_device_has_isolated_msi() for a group ✨

✨ SYNOPSIS ✨

bool iommu_group_has_isolated_msi (struct iommu_group *group );

🎀 ARGUMENTS 🎀

• group — the group to query 👀

💖 DESCRIPTION 💖

okay so picture this: IOMMU groups should not have differing values of msi_device_has_isolated_msi for devices in a group. that's the dream 🌈

but — and this is the important part — nothing directly prevents this, bestie. not a single thing 😭 so this function is here to make sure mistakes don't result in isolation failures by checking that all the devices are the same. it's giving “trust but verify” energy fr fr 💅

no cap, this is a safety check: all devices in the group gotta match, or the isolation vibes are off 💀

👑 SEE ALSO 👑

Kernel file ./drivers/iommu/iommu.c — and literally all these icons:

• 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_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_get_resv_regions(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)

mwah 💋 sourced from ./drivers/iommu, version iommu_group_...isolated_msi(9), dated October 2026 — slay and stay isolated, bestie 🫶✨