> > Project Zero (Google) found it; > https://googleprojectzero.blogspot.com.au/2018/01/ > reading-privileged-memory-with-side.html > > Phoronix has done some benchmarks on the impact of the kernel based > workaround ([Kernel] Page Table Isolation (PSI) nee Kaiser) > https://www.phoronix.com/scan.php?page=article&item=linux- > more-x86pti&num=1 > > Re:AMD - Looks like Linus agrees that PTI is not required for AMD CPUs. Note that the project zero blog mentions that some AMD chips are subject to some issues*. *There's three CVEs *.*
From: https://www.phoronix.com/scan.php?page=news_item&px=Linux-Tip-Git-Disable-x86-PTI *"Update:* Linus Torvalds has now ended up pulling <https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=00a5ae218d57741088068799b810416ac249a9ce&utm_source=anz> the latest PTI fixes that also include the change to disable page table isolation for now on all AMD CPUs. The commit is in mainline for Linux 4.15 along with a few basic fixes and ensuring PAGE_TABLE_ISOLATION is enabled by default. "
