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| author |   Jiaxun Yang <jiaxun.yang@flygoat.com> | 2018-11-20 11:00:18 +0800 |
|---|---|---|
| committer |   Borislav Petkov <bp@suse.de> | 2019-01-18 16:44:03 +0100 |
| commit | 0237199186e7a4aa5310741f0a6498a20c820fd7 (patch) | |
| tree | 009bc89b0e9a1053f802acdae1ef5244f0e7c232 /arch/x86/kernel/cpu | |
| parent | Linux 5.0-rc2 (diff) | |
| download | linux-dev-0237199186e7a4aa5310741f0a6498a20c820fd7.tar.xz linux-dev-0237199186e7a4aa5310741f0a6498a20c820fd7.zip | |
x86/CPU/AMD: Set the CPB bit unconditionally on F17h
Some F17h models do not have CPB set in CPUID even though the CPU
supports it. Set the feature bit unconditionally on all F17h.
[ bp: Rewrite commit message and patch. ]
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Sherry Hurwitz <sherry.hurwitz@amd.com>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20181120030018.5185-1-jiaxun.yang@flygoat.com
Diffstat (limited to 'arch/x86/kernel/cpu')
| -rw-r--r-- | arch/x86/kernel/cpu/amd.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index 69f6bbb41be0..01004bfb1a1b 100644 --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -819,11 +819,9 @@ static void init_amd_bd(struct cpuinfo_x86 *c) static void init_amd_zn(struct cpuinfo_x86 *c) { set_cpu_cap(c, X86_FEATURE_ZEN); - /* - * 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_stepping <= 1) + + /* Fix erratum 1076: CPB feature bit not being set in CPUID. */ + if (!cpu_has(c, X86_FEATURE_CPB)) set_cpu_cap(c, X86_FEATURE_CPB); } |