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x86/CPU/AMD: Carve out the erratum 1386 fix
Call it on the affected CPU generations. No functional changes. Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Reviewed-by: Nikolay Borisov <nik.borisov@suse.com> Link: http://lore.kernel.org/r/20231120104152.13740-3-bp@alien8.de
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1 changed files with 15 additions and 9 deletions
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@ -984,6 +984,19 @@ static void init_amd_bd(struct cpuinfo_x86 *c)
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clear_rdrand_cpuid_bit(c);
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}
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static void fix_erratum_1386(struct cpuinfo_x86 *c)
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{
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/*
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* Work around Erratum 1386. The XSAVES instruction malfunctions in
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* certain circumstances on Zen1/2 uarch, and not all parts have had
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* updated microcode at the time of writing (March 2023).
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*
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* Affected parts all have no supervisor XSAVE states, meaning that
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* the XSAVEC instruction (which works fine) is equivalent.
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*/
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clear_cpu_cap(c, X86_FEATURE_XSAVES);
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}
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void init_spectral_chicken(struct cpuinfo_x86 *c)
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{
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#ifdef CONFIG_CPU_UNRET_ENTRY
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@ -1004,15 +1017,6 @@ void init_spectral_chicken(struct cpuinfo_x86 *c)
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}
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}
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#endif
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/*
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* Work around Erratum 1386. The XSAVES instruction malfunctions in
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* certain circumstances on Zen1/2 uarch, and not all parts have had
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* updated microcode at the time of writing (March 2023).
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*
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* Affected parts all have no supervisor XSAVE states, meaning that
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* the XSAVEC instruction (which works fine) is equivalent.
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*/
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clear_cpu_cap(c, X86_FEATURE_XSAVES);
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}
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static void init_amd_zn(struct cpuinfo_x86 *c)
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@ -1080,10 +1084,12 @@ static void zenbleed_check(struct cpuinfo_x86 *c)
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static void init_amd_zen(struct cpuinfo_x86 *c)
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{
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fix_erratum_1386(c);
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}
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static void init_amd_zen2(struct cpuinfo_x86 *c)
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{
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fix_erratum_1386(c);
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}
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static void init_amd_zen3(struct cpuinfo_x86 *c)
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