Module Name: src Committed By: mrg Date: Tue Jul 25 01:09:05 UTC 2023
Modified Files: src/sys/arch/x86/include: specialreg.h src/sys/arch/x86/x86: errata.c Log Message: x86: turn off zenbleed chicken bit on Zen2 cpus. this is based upon Taylor's original work. i just made the list of CPUs to run on correct as i could determine. (also, add some Zen3 and Zen4 cpuids not yet used by any errata.) (might be nice to have a better way to expression revision ranges rather than specific cpuid matches, eg, 0x30-0x4f models in a cpu family, etc.) tested on ryzen 3600, and a ported zenbleed PoC that no longer shows any obtained text. (a similar module-version of it stopped the PoC on a ryzen 3950x without having to reboot.) https://www.amd.com/en/resources/product-security/bulletin/amd-sb-7008.html https://lock.cmpxchg8b.com/zenbleed.html To generate a diff of this commit: cvs rdiff -u -r1.206 -r1.207 src/sys/arch/x86/include/specialreg.h cvs rdiff -u -r1.30 -r1.31 src/sys/arch/x86/x86/errata.c Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files.