From 5219747d67f0f3860dc3ccf54bc9473b2aec0311 Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Fri, 14 Jan 2022 14:48:01 -0800 Subject: x86: Black list more Intel CPUs for TSX [BZ #27398] Disable TSX and enable RTM_ALWAYS_ABORT for Intel CPUs listed in: https://www.intel.com/content/www/us/en/support/articles/000059422/processors.html This fixes BZ #27398. Reviewed-by: Noah Goldstein (cherry picked from commit 1e000d3d33211d5a954300e2a69b90f93f18a1a1) --- sysdeps/x86/cpu-features.c | 35 ++++++++++++++++++++++++++++++++--- 1 file changed, 32 insertions(+), 3 deletions(-) diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c index 90be104842..6971a19bee 100644 --- a/sysdeps/x86/cpu-features.c +++ b/sysdeps/x86/cpu-features.c @@ -329,11 +329,40 @@ init_cpu_features (struct cpu_features *cpu_features) break; } - /* Disable TSX on some Haswell processors to avoid TSX on kernels that - weren't updated with the latest microcode package (which disables - broken feature by default). */ + /* Disable TSX on some processors to avoid TSX on kernels that + weren't updated with the latest microcode package (which + disables broken feature by default). */ switch (model) { + case 0x55: + if (stepping <= 5) + goto disable_tsx; + break; + case 0x8e: + /* NB: Although the errata documents that for model == 0x8e, + only 0xb stepping or lower are impacted, the intention of + the errata was to disable TSX on all client processors on + all steppings. Include 0xc stepping which is an Intel + Core i7-8665U, a client mobile processor. */ + case 0x9e: + if (stepping > 0xc) + break; + /* Fall through. */ + case 0x4e: + case 0x5e: + { + /* Disable Intel TSX and enable RTM_ALWAYS_ABORT for + processors listed in: + +https://www.intel.com/content/www/us/en/support/articles/000059422/processors.html + */ +disable_tsx: + cpu_features->cpuid[index_cpu_RTM].reg_RTM + &= ~bit_cpu_RTM; + cpu_features->cpuid[index_cpu_RTM_ALWAYS_ABORT].reg_RTM_ALWAYS_ABORT + |= bit_cpu_RTM_ALWAYS_ABORT; + } + break; case 0x3f: /* Xeon E7 v3 with stepping >= 4 has working TSX. */ if (stepping >= 4) -- cgit 1.4.1