From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andi Kleen <ak@linux.intel.com>
Subject: Re: [RFC,05/10] x86/speculation: Add basic IBRS support
 infrastructure
Date: Mon, 29 Jan 2018 13:37:49 -0800
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Cc: Arjan van de Ven <arjan@linux.intel.com>,
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        Jun Nakajima <jun.nakajima@intel.com>,
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        Linus Torvalds <torvalds@linux-foundation.org>,
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> The question is about all the additional RSB-frobbing and call depth
> counting and other bits that don't really even exist for Skylake yet in
> a coherent form.

We have had several patch kits posted that all are in a "coherent form"

That was the original one

http://lkml.iu.edu/hypermail/linux/kernel/1801.1/05556.html

and that's the newer one with only interrupt stuffing

https://marc.info/?l=linux-kernel&m=151674718914504

We don't have generic deep chain handling yet, but everything else
is there.

-Andi