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Interrupt Remapping on x86_64

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I am trying to find out when kernel updates the interrupt remapping table entries. I am studying Intel vtd-io document which defines the structure of interrupt remapping table entry. This structure is also defined in Linux irq_remapping, but I am not able to find any reference where it actually updates/add new entries in the table. Add, modify, irte entry functions are already defined in irq_remapping.c.

Can you share a reference: when and where the Linux kernel add irte in interrupt_remapping table for a device, in xapic (x2apic preferably) mode? Is it calling and modifying this table except this location alloc_irte?

I sit in a Tesla and translated this thread with Ai:

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