> On 12 Jan 2018, at 14:10, Marcin Wojtas <m...@semihalf.com> wrote: > > Hi Andrew, > > > > 2018-01-12 15:01 GMT+01:00 Andrew Turner <and...@freebsd.org > <mailto:and...@freebsd.org>>: >> Author: andrew >> Date: Fri Jan 12 14:01:38 2018 >> New Revision: 327876 >> URL: https://svnweb.freebsd.org/changeset/base/327876 >> >> Log: >> Workaround Spectre Variant 2 on arm64. >> >> We need to handle two cases: >> >> 1. One process attacking another process. >> 2. A process attacking the kernel. >> >> For the first case we clear the branch predictor state on context switch >> between different processes. For the second we do this when taking an >> instruction abort on a non-userspace address. >> >> To clear the branch predictor state a per-CPU function pointer has been >> added. This is set by the new cpu errata code based on if the CPU is >> known to be affected. >> >> On Cortex-A57, A72, A73, and A75 we call into the PSCI firmware as newer >> versions of this will clear the branch predictor state for us. >> >> It has been reported the ThunderX is unaffected, however the ThunderX2 is >> vulnerable. The Qualcomm Falkor core is also affected. As FreeBSD doesn't >> yet run on the ThunderX2 or Falkor no workaround is included for these CPUs. > > Regardless ThunderX2 / Falkor work-arounds, do I understand correctly > that pure CA72 machines, such as Marvell Armada 7k/8k are immune to > Variant 2 now?
It is my understanding that the A72 will be immune with this patch and an updated Arm Trusted Firmware as documented in [1]. Andrew [1] https://github.com/ARM-software/arm-trusted-firmware/wiki/ARM-Trusted-Firmware-Security-Advisory-TFV-6 <https://github.com/ARM-software/arm-trusted-firmware/wiki/ARM-Trusted-Firmware-Security-Advisory-TFV-6> _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
