iopt_pages_unfill_xarray(9)

💅 iopt_pages_unfill_xarray(9) — the Kernel API Manual, bestie edition

okay so today we're learning about iopt_pages_unfill_xarray, straight out of the Kernel API Manual. yes it's a mouthful, no you're not gonna say it out loud at a party 🎀

✨ NAME ✨

iopt_pages_unfill_xarray — update the xarry after removing an access 🦋

✨ SYNOPSIS ✨

void iopt_pages_unfill_xarray (struct iopt_pages *pages , unsigned long
start_index , unsigned long last_index );

like, look at her. three params, zero chill 💅

✨ ARGUMENTS ✨

• pages — the pages to act on 💖 these are the actual stars of the show, the pages we're doing stuff to
• start_index — the starting PFN index ✨ where we begin, bestie
• last_index — the last PFN index 🌸 where we stop, obviously

✨ DESCRIPTION ✨

so here's the tea ☕ this one gets called when an iopt_pages_access is removed, and what it does is remove pages from the itree. iconic behaviour, honestly.

and listen — there's a very important detail here that you literally cannot skip 🙈 the access should already be removed from the access_itree by the time this runs. that's the vibe check, that's the prerequisite, that's non-negotiable. so make sure that already happened first, okay? iykyk 💀

✨ SEE ALSO ✨

• Kernel file ./drivers/iommu/iommufd/pages.c
• iopt_area_unmap_domain(9)
• iopt_area_unfill_domain(9)
• iopt_area_fill_domain(9)
• iopt_area_fill_domains(9)
• iopt_area_unfill_domains(9)
• iopt_pages_fill_from_xarray(9)
• iopt_pages_fill_xarray(9)
• iopt_pages_rw_access(9)
• iopt_area_add_access(9)
• iopt_area_remove_access(9)

the whole friend group honestly, go read them all 🫶

and that's the page, babes 💜 this little gem lives in ./drivers/iommu/iommufd and it's dated October 2026 — go off, king 👑 slay, periodt ⭐🌈