gmap_is_shadow_valid(9)

✨ gmap_is_shadow_valid(9) ✨

okay so bestie, this is a page straight out of the Kernel API Manual, and it's literally the vibe check function for shadow guest address spaces. yes we're in that gmap_is_shadow_valid era 💅

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🌸 NAME 🌸

gmap_is_shadow_valid — checks if a shadow guest address space matches the given properties and is still valid. that's it, that's the whole job, no cap 🫶

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🎀 SYNOPSIS 🎀

bool gmap_is_shadow_valid (struct gmap *sg , union asce asce , int
edat_level );

like, look at her go 😭 she returns a bool and she takes three things, we love a tidy signature ✨

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🦋 ARGUMENTS 🦋

• sg — pointer to the shadow guest address space structure. the main character of this whole function fr 💖
• asce — the ASCE for which the shadow table is requested. yes, that ASCE 👑
• edat_level — the Edat level to be used for the shadow translation. pick your level, bestie 🌈

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💀 RETURN 💀

returns true if the gmap shadow is still valid and matches the given properties, and the caller can keep on using it — slay, continue, you're good 💅

returns false otherwise. and in that case the caller has to request a new shadow gmap. no reusing the stale one, that's giving expired vibes 🙈

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🔥 SEE ALSO 🔥

• Kernel file ./arch/s390/kvm/gmap/gmap.h
• enum gmap_flags(9)
• pte_needs_unshadow(9)
• crste_needs_unshadow(9)

go read those too, iykyk 📚✨

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💜 friendly reminder from your girl: the false branch is not a suggestion — go get yourself a brand new shadow gmap, periodt.

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okay bestie that's the whole page, hope the vibe check passed!! this iconic lil doc lives in ./arch/s390/kvm/gmap, dated October 2026 — mwah, drink water, and don't forget to unshadow responsibly 🧚💖🎀