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SubjectRe: [RFC 09/10] x86/enter: Create macros to restrict/unrestrict Indirect Branch Speculation
[ Dropping large CC list ]

On 25/01/2018 18:16, Greg Kroah-Hartman wrote:

> 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 buried in one of the arm64 trees, and
> they have been posted to the mailing list a few times in the past.

Found the burial ground, thanks Greg.


"For Cortex-R8, Cortex-A8, Cortex-A9, and Cortex-A17, invalidate
the branch predictor using a BPIALL instruction."

The latest arm32 patch series was submitted recently:


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