STRUCT PT_IOMMU_CFG(9)

💜 struct pt_iommu_cfg(9) — the Kernel API Manual glow-up ✨

okay so bestie, welcome to the struct pt_iommu_cfg(9) page — it's a section 9 kernel API manual entry and honestly it's giving "shared settings, but make it official" 🎀

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✨ NAME ✨

struct pt_iommu_cfg — Common configuration values for all formats. That's it, that's the whole vibe: one struct holding the config bits that every format needs. 🌸

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🦋 SYNOPSIS 🦋

struct pt_iommu_cfg {
    unsigned int features;
    u8 hw_max_vasz_lg2;
    u8 hw_max_oasz_lg2;
 };

look at her. three fields. immaculate. no cap. 💅

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👑 Members 👑

• features — the features you're requiring. Only these features will be turned on, periodt. And real talk: the feature list should reflect what the IOMMU HW is actually capable of — so don't be out here claiming stuff the hardware can't do, that's not the move 🙈
• hw_max_vasz_lg2 — the Maximum VA the IOMMU HW can support. Fair warning: this will imply the top level of the table, so like… it's kind of a big deal 👀
• hw_max_oasz_lg2 — the Maximum OA the IOMMU HW can support. Slight catch though: the format might select a lower maximum OA, so this is the ceiling, not a promise 🔥

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💖 SEE ALSO 💖

• Kernel file ./include/linux/generic_pt/iommu.h
• IOMMU Radix Page Table(9)
• struct pt_iommu(9)
• struct pt_iommu_info(9)
• struct pt_iommu_driver_ops(9)

like, go read those too, they're all in the same friend group iykyk 🫶

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ngl the whole family is worth a read — this struct does not exist in a vacuum bestie 💀

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and that's the page!! mwah 💋 this one lives in ./include/linux/generic_pt, dated October 2026 — so when you're flipping through the kernel docs, tell 'em struct pt_iommu_cfg(9) sent you 💜✨🎀