On Wed, Jun 01, 2011 at 09:07:51PM +0800, Yang, Wei Y wrote:
>
> This patch masks CPUID leaf 7 ebx against host capability word9.
>
> Signed-off-by: Yang, Wei <wei.y.yang@xxxxxxxxx>
> Signed-off-by: Shan, Haitao <haitao.shan@xxxxxxxxx>
> Signed-off-by: Li, Xin <xin.li@xxxxxxxxx>
>
> ---
> arch/x86/kvm/x86.c | 21 ++++++++++++++++++++-
> 1 files changed, 20 insertions(+), 1 deletions(-)
>
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 91bfc40..d27202d 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -2353,6 +2353,10 @@ 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);
> @@ -2387,7 +2391,7 @@ 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;
>
> @@ -2404,6 +2408,21 @@ 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->edx, 9);
ebx?
> + }
> + else
> + entry->ebx = 0;
indentation is wrong.
> + entry->eax = 0;
> + entry->ecx = 0;
> + entry->edx = 0;
> + break;
> + }
> + /* function 0xb has additional index. */
> case 0xb: {
> int i, level_type;
--
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