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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH v2] sparc64: Add support for Application Data Integrity
 (ADI)
Date: Mon, 07 Mar 2016 14:19:50 -0500 (EST)
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From: Andy Lutomirski <luto@amacapital.net>
Date: Mon, 7 Mar 2016 10:49:57 -0800

> What data structure or structures changes when this stxa instruction happens?

An internal table, maintained by the CPU and/or hypervisor, and if in physical
addresses then in a region which is only accessible by the hypervisor.

The table is not accessible by the kernel at all via loads or stores.