On 17/05/18 14:20, Jan Beulich wrote:
> Just like for HVM the feature set should be used for EBX output, while
> EAX should be restricted to the low 16 bits and ECX/EDX should be zero.
>
> Short of there being white listing in place just like on the HVM side,
> also zap leaves 6, 9, and 0x80000007 as well as unknown / reserved ones.
>
> Signed-off-by: Jan Beulich <jbeul...@suse.com>

Do you want this for backporting?

The changes below are enforced by recalculate_cpuid_policy() (and in
particular, recaluclate_misc()) in the hypervisor for the past few
releases, and Sergey is currently in the process of making all of this
libxc logic disappear.

~Andrew

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