linux-kernel - Re: [RFC 09/10] x86/enter: Create macros to restrict/unrestrict Indirect Branch Speculation

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Message-ID: <20180125171616.GA25130@kroah.com>
Date:   Thu, 25 Jan 2018 18:16:16 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Mason <slash.tmp@...e.fr>
Cc:     Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        KarimAllah Ahmed <karahmed@...zon.de>,
        Andi Kleen <ak@...ux.intel.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Asit Mallick <asit.k.mallick@...el.com>,
        Borislav Petkov <bp@...e.de>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        "H . Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Janakarajan Natarajan <Janakarajan.Natarajan@....com>,
        Joerg Roedel <joro@...tes.org>,
        Jun Nakajima <jun.nakajima@...el.com>,
        Laura Abbott <labbott@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 09/10] x86/enter: Create macros to restrict/unrestrict
 Indirect Branch Speculation

On Thu, Jan 25, 2018 at 05:19:04PM +0100, Mason wrote:
> On 23/01/2018 10:30, David Woodhouse wrote:
> 
> > Skylake takes predictions from the generic branch target buffer when
> > the RSB underflows.
> 
> Adding LAKML.
> 
> AFAIU, some ARM Cortex cores have the same optimization.
> (A9 maybe, A17 probably, some recent 64-bit cores)
> 
> Are there software work-arounds for Spectre planned for arm32 and arm64?

Yes, I think they are currently burried in one of the arm64 trees, and
they have been posted to the mailing list a few times in the past.

thanks,

greg k-h