On Fri, Feb 23, 2018 at 09:02:46AM +0000, Ard Biesheuvel wrote:
On 23 February 2018 at 03:17, Guo Heyi heyi.guo@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