From mboxrd@z Thu Jan  1 00:00:00 1970
From: Arjan van de Ven <arjan@linux.intel.com>
Subject: Re: [RFC,05/10] x86/speculation: Add basic IBRS support
 infrastructure
Date: Mon, 29 Jan 2018 17:32:05 -0800
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Cc: Eduardo Habkost <ehabkost@redhat.com>,
        KarimAllah Ahmed <karahmed@amazon.de>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Andi Kleen <ak@linux.intel.com>,
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        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>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Paolo Bon
To: Linus Torvalds <torvalds@linux-foundation.org>,
        David Woodhouse <dwmw2@infradead.org>
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On 1/29/2018 4:23 PM, Linus Torvalds wrote:
>
> Why do you even _care_ about the guest, and how it acts wrt Skylake?
> What you should care about is not so much the guests (which do their
> own thing) but protect guests from each other, no?

the most simple solution is that we set the internal feature bit in Linux
to turn on the "stuff the RSB" workaround is we're on a SKL *or* as a guest in a VM.

The stuffing is not free, but it's also not insane either... so if it's turned on in guests,
the impact is still limited, while bare metal doesn't need it at all