acpi_viot_early_init(9)

okay so bestie, welcome to the acpi_viot_early_init(9) page in the Kernel API Manual 💖 this one is short, sweet, and honestly kinda iconic: it checks for VIOT and turns on ACS.

🌸 NAME 🌸

acpi_viot_early_init — Test the presence of VIOT and enable ACS 💅

🦋 SYNOPSIS 🦋

void acpi_viot_early_init (void );

🎀 ARGUMENTS 🎀

• void — no arguments, bestie. literally none. 🫶

💜 DESCRIPTION 💜

So here's the vibe: if the VIOT does exist, ACS must be enabled. periodt. ✨

The important plot twist is that this cannot be done in acpi_viot_init, because acpi_viot_init is called after the bus scan. so this function handles it instead. no cap. 💅

🌈 SEE ALSO 🌈

• Kernel file ./drivers/acpi/viot.c
• acpi_viot_init(9)
• viot_iommu_configure(9)

that's the whole page, bestie 🧚 xoxo from ./drivers/acpi, October 2026 edition — catch u later 💖