vbg_req_allowed(9)

✨ vbg_req_allowed(9) ✨

okay bestie, so this one's from the Kernel API Manual and it's literally called vbg_req_allowed — say that three times fast 💅 it's the vibe-check function of the VirtualBox guest world, no cap.

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🌸 NAME 🌸

vbg_req_allowed — the bouncer at the club 🫶 she checks if the VMM request is allowed in the context of the given session. that's it, that's the whole job, and she does it iconically.

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🎀 SYNOPSIS 🎀

int vbg_req_allowed (struct vbg_dev *gdev , struct vbg_session *session
, const struct vmmdev_request_header *req );

look at her go 😭 three pointers and an int, she's serving compact-and-functional, lowkey main character energy.

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🦋 ARGUMENTS 🦋

• gdev — the Guest extension device. the whole device she's inspecting, basically the venue 🏟️
• session — the calling session. who's asking, bestie, iykyk 👑
• req — the request. the actual thing being checked, the star of the show ✨

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💜 RETURN 💜

0 or negative errno value.

that's it. either a cute little 0 (we love a zero) or a negative errno and you go debug 😭 that's the whole range, no in-between, she's not complicated fr fr.

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🌈 SEE ALSO 🌈

the gossip chain, aka everyone she's adjacent to 💖 the kernel file lives right here: ./drivers/virt/vboxguest/vboxguest_core.c

and here's the full bestie list, every single one, not skipping a single (9) 👏:

• vbg_guest_mappings_init(9)
• vbg_guest_mappings_exit(9)
• vbg_report_guest_info(9)
• vbg_report_driver_status(9)
• vbg_balloon_inflate(9)
• vbg_balloon_deflate(9)
• vbg_heartbeat_host_config(9)
• vbg_heartbeat_init(9)
• vbg_heartbeat_exit(9)
• vbg_track_bit_usage(9)
• vbg_reset_host_event_filter(9)
• vbg_set_session_event_filter(9)
• vbg_reset_host_capabilities(9)
• vbg_set_host_capabilities(9)
• vbg_acquire_session_capabilities(9)
• vbg_set_session_capabilities(9)
• vbg_query_host_version(9)
• vbg_core_init(9)
• vbg_core_exit(9)
• vbg_core_open_session(9)
• vbg_core_close_session(9)
• vbg_core_ioctl(9)
• vbg_core_set_mouse_status(9)

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ok so lowkey the whole point: she returns 0 if the request is allowed, negative errno if not. the manpage doesn't spell out every rejection reason and neither will i 💀 go read the source, bestie, it's right there above ⬆️

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that's the whole page, periodt 🎀 and before you go — shoutout to the source ./drivers/virt/vboxguest, dated October 2026, 💖 she ate and left no crumbs 🌸🦋✨