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KVM: Mask function7 ebx against host capability word9

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This patch masks CPUID leaf 7 ebx against host capability word9.

Signed-off-by: Yang, Wei <wei.y.yang@intel.com>
Signed-off-by: Shan, Haitao <haitao.shan@intel.com>
Signed-off-by: Li, Xin <xin.li@intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Yang, Wei Y 2011-06-03 11:14:03 +08:00 committed by Avi Kivity
parent c68b734fba
commit 611c120f74
1 changed files with 19 additions and 1 deletions
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20
arch/x86/kvm/x86.c
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@ -2359,6 +2359,10 @@ static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
F(ACE2) | F(ACE2_EN) | F(PHE) | F(PHE_EN) |
F(PMM) | F(PMM_EN);
/* cpuid 7.0.ebx */
const u32 kvm_supported_word9_x86_features =
F(SMEP);
/* all calls to cpuid_count() should be made on the same cpu */
get_cpu();
do_cpuid_1_ent(entry, function, index);
@ -2393,7 +2397,7 @@ static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
}
break;
}
/* function 4 and 0xb have additional index. */
/* function 4 has additional index. */
case 4: {
int i, cache_type;
@ -2410,8 +2414,22 @@ static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
}
break;
}
case 7: {
entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
/* Mask ebx against host capbability word 9 */
if (index == 0) {
entry->ebx &= kvm_supported_word9_x86_features;
cpuid_mask(&entry->ebx, 9);
} else
entry->ebx = 0;
entry->eax = 0;
entry->ecx = 0;
entry->edx = 0;
break;
}
case 9:
break;
/* function 0xb has additional index. */
case 0xb: {
int i, level_type;