1 files changed, 10 insertions, 0 deletions

diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 8ea6929e974c..43c1dcf0bec7 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -29,6 +29,16 @@
 
 static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
 {
+        u64 misc_enable;
+
+        /* Unmask CPUID levels if masked */
+        if (!rdmsrl_safe(MSR_IA32_MISC_ENABLE, &misc_enable) &&
+            (misc_enable & MSR_IA32_MISC_ENABLE_LIMIT_CPUID)) {
+                misc_enable &= ~MSR_IA32_MISC_ENABLE_LIMIT_CPUID;
+                wrmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
+                c->cpuid_level = cpuid_eax(0);
+        }
+
         if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
                 (c->x86 == 0x6 && c->x86_model >= 0x0e))
                 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);