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Date:   Tue, 23 Jan 2018 14:49:56 -0800
From:   Andi Kleen <ak@linux.intel.com>
To:     Tom Lendacky <thomas.lendacky@amd.com>
Cc:     "Woodhouse, David" <dwmw@amazon.co.uk>,
        Andy Lutomirski <luto@amacapital.net>,
        KarimAllah Ahmed <karahmed@amazon.de>,
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        Andrea Arcangeli <aarcange@redhat.com>,
        Andy Lutomirski <luto@kernel.org>,
        Arjan van de Ven <arjan@linux.intel.com>,
        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>,
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        Tim Chen <tim.c.chen@linux.intel.com>, kvm@vger.kernel.org,
        x86@kernel.org, Arjan Van De Ven <arjan.van.de.ven@intel.com>
Subject: Re: [RFC 09/10] x86/enter: Create macros to restrict/unrestrict
 Indirect Branch Speculation
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> Not sure.  Maybe to start, the answer might be to allow it to be set for
> the ultra-paranoid, but in general don't enable it by default.  Having it
> enabled would be an alternative to someone deciding to disable SMT, since
> that would have even more of a performance impact.

I agree. A reasonable strategy would be to only enable it for
processes that have dumpable disabled. This should be already set for
high value processes like GPG, and allows others to opt-in if
they need to.

-Andi