Re: [Qemu-devel] [PATCH v3 1/3] target-i386: add pkeys support for cpuid handling

[Eduardo Habkost]

On Wed, Nov 18, 2015 at 10:20:15AM +0800, Huaitong Han wrote:
[...]
> @@ -408,6 +420,13 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] 
> = {
>          .cpuid_reg = R_EBX,
>          .tcg_features = TCG_7_0_EBX_FEATURES,
>      },
> +    [FEAT_7_0_ECX] = {
> +        .feat_names = cpuid_7_0_ecx_feature_name,
> +        .cpuid_eax = 7,
> +        .cpuid_needs_ecx = true, .cpuid_ecx = 0,
> +        .cpuid_reg = R_ECX,
> +        .tcg_features = TCG_7_0_ECX_FEATURES,
> +    },

The patch looks good, but when we add the feature names to
cpuid_7_0_ecx_feature_name, QEMU will consider them as
migratable, but they are truly migratable only after we add the
ext_save_areas entry.

We can fix this by moving cpuid_7_0_ecx_feature_name to patch 2/3
(or to a separate patch, to be applied after 2/3).

-- 
Eduardo