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x86, cpu: After uncapping CPUID, re-run CPU feature detection

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commit d900329e20 upstream.

After uncapping the CPUID level, we need to also re-run the CPU
feature detection code.

This resolves kernel bugzilla 16322.

Reported-by: boris64 <bugzilla.kernel.org@boris64.net>
LKML-Reference: <tip-@git.kernel.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
H. Peter Anvin
2010-09-28 15:35:01 -07:00
committed by Greg Kroah-Hartman
parent 00095879d5
commit 428a771add
3 changed files with 3 additions and 1 deletions
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2
arch/x86/kernel/cpu/common.c
View File

@@ -540,7 +540,7 @@ void __cpuinit cpu_detect(struct cpuinfo_x86 *c)
}
}
static void __cpuinit get_cpu_cap(struct cpuinfo_x86 *c)
void __cpuinit get_cpu_cap(struct cpuinfo_x86 *c)
{
u32 tfms, xlvl;
u32 ebx;

1
arch/x86/kernel/cpu/cpu.h
View File

@@ -33,5 +33,6 @@ extern const struct cpu_dev *const __x86_cpu_dev_start[],
*const __x86_cpu_dev_end[];
extern void display_cacheinfo(struct cpuinfo_x86 *c);
extern void get_cpu_cap(struct cpuinfo_x86 *c);
#endif

1
arch/x86/kernel/cpu/intel.c
View File

@@ -40,6 +40,7 @@ static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
misc_enable &= ~MSR_IA32_MISC_ENABLE_LIMIT_CPUID;
wrmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
c->cpuid_level = cpuid_eax(0);
get_cpu_cap(c);
}
}