[ 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. https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/log/?h=kpti Via https://developer.arm.com/support/security-update "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: https://www.spinics.net/lists/arm-kernel/msg630892.html Regards.
