On Fri, Feb 23, 2018 at 09:02:46AM +0000, Ard Biesheuvel wrote:
> On 23 February 2018 at 03:17, Guo Heyi <heyi....@linaro.org> wrote:
> > Hi Jeremy,
> >
> > This TF binaries have not been patched the latest SMCCC workaround; it is 
> > based
> > on v1.4 release and was only
> > patched with "disable/enable MMU in PSCI SMC call", as the commit in 
> > upstream TF
> > code:
> > f62ad322695d16178db464dc062fe0af592c6780
> >
> > When we generated these binaries, SMCCC patches had not come out so they 
> > are not
> > contained in these binaries.
> >
> > Do you recommend using the latest smccc patches?
> >
> 
> Yes.
> 
> The Spectre v2 mitigations that landed in v4.16 and were backported to
> v4.15 and v4.14 LTS do not use the PSCI_VERSION call anymore to
> perform branch predictor invalidation. Instead, it checks for
> SMCCCv1.1, and uses the ARCH_WORKAROUND_1 SMC call if supported. If
> not, no BP maintenance is performed.

Thanks, we'll try to apply the smccc patch to TF.

Heyi
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