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Date: Mon, 29 Jan 2018 13:37:49 -0800
From: Andi Kleen <ak@linux.intel.com>
To: David Woodhouse <dwmw2@infradead.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>,
	Eduardo Habkost <ehabkost@redhat.com>,
	KarimAllah Ahmed <karahmed@amazon.de>, linux-kernel@vger.kernel.org,
	Andrea Arcangeli <aarcange@redhat.com>,
	Andy Lutomirski <luto@kernel.org>, Ashok Raj <ashok.raj@intel.com>,
	Asit Mallick <asit.k.mallick@intel.com>,
	Borislav Petkov <bp@suse.de>,
	Dan Williams <dan.j.williams@intel.com>,
	Dave Hansen <dave.hansen@intel.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"H . Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
	Janakarajan Natarajan <Janakarajan.Natarajan@amd.com>,
	Joerg Roedel <joro@8bytes.org>,
	Jun Nakajima <jun.nakajima@intel.com>,
	Laura Abbott <labbott@redhat.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Radim =?utf-8?B?S3LEjW3DocWZ?= <rkrcmar@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Tim Chen <tim.c.chen@linux.intel.com>,
	Tom Lendacky <thomas.lendacky@amd.com>, kvm@vger.kernel.org,
	x86@kernel.org, "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Subject: Re: [RFC,05/10] x86/speculation: Add basic IBRS support
 infrastructure
Message-ID: <20180129213749.GS26209@tassilo.jf.intel.com>
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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