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| author |   Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-17 08:05:54 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-17 08:05:54 -0700 |
| commit | c44d1ac0c38e24e6463a02fef315ec0b73304b96 (patch) | |
| tree | dcd343547b8201848a0c3894bd980b13adf05df9 | |
| parent | Linux 4.14-rc1 (diff) | |
| parent | x86/cpu/AMD: Fix erratum 1076 (CPB bit) (diff) | |
| download | linux-dev-c44d1ac0c38e24e6463a02fef315ec0b73304b96.tar.xz linux-dev-c44d1ac0c38e24e6463a02fef315ec0b73304b96.zip | |
Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fix from Thomas Gleixner:
"A single fix addressing the missing CP8 feature bit in CPUID for a
range of AMD ZEN models/mask revisions"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/cpu/AMD: Fix erratum 1076 (CPB bit)
| -rw-r--r-- | arch/x86/kernel/cpu/amd.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index 9862e2cd6d93..d58184b7cd44 100644 --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -763,6 +763,16 @@ static void init_amd_bd(struct cpuinfo_x86 *c) } } +static void init_amd_zn(struct cpuinfo_x86 *c) +{ + /* + * Fix erratum 1076: CPB feature bit not being set in CPUID. It affects + * all up to and including B1. + */ + if (c->x86_model <= 1 && c->x86_mask <= 1) + set_cpu_cap(c, X86_FEATURE_CPB); +} + static void init_amd(struct cpuinfo_x86 *c) { early_init_amd(c); @@ -791,6 +801,7 @@ static void init_amd(struct cpuinfo_x86 *c) case 0x10: init_amd_gh(c); break; case 0x12: init_amd_ln(c); break; case 0x15: init_amd_bd(c); break; + case 0x17: init_amd_zn(c); break; } /* Enable workaround for FXSAVE leak */ |