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x86, AMD: Disable wrongly set X86_FEATURE_LAHF_LM CPUID bit 

fbd8b1819e turns off the bit for
/proc/cpuinfo. However, a proper/full fix would be to additionally
turn off the bit in the CPUID output so that future callers get
correct CPU features info.

Do that by basically reversing what the BIOS wrongfully does at boot.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
LKML-Reference: <1251705011-18636-3-git-send-email-petkovbb@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Borislav Petkov 2009-08-31 09:50:11 +02:00 committed by H. Peter Anvin
parent 177fed1ee8
commit 6b0f43ddfa
1 changed files with 10 additions and 1 deletions
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11
arch/x86/kernel/cpu/amd.c
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@ -404,9 +404,18 @@ static void __cpuinit init_amd(struct cpuinfo_x86 *c)
/*
* Some BIOSes incorrectly force this feature, but only K8
* revision D (model = 0x14) and later actually support it.
* (AMD Erratum #110, docId: 25759).
*/
if (c->x86_model < 0x14)
if (c->x86_model < 0x14 && cpu_has(c, X86_FEATURE_LAHF_LM)) {
u64 val;
clear_cpu_cap(c, X86_FEATURE_LAHF_LM);
if (!rdmsrl_amd_safe(0xc001100d, &val)) {
val &= ~(1ULL << 32);
wrmsrl_amd_safe(0xc001100d, val);
}
}
}
if (c->x86 == 0x10 || c->x86 == 0x11)
set_cpu_cap(c, X86_FEATURE_REP_GOOD);