[PATCH 13/26] KVM: PPC: Add feature bitmap for magic page

[Avi Kivity]

  On 08/17/2010 04:57 PM, Alexander Graf wrote:
> We will soon add SR PV support to the shared page, so we need some
> infrastructure that allows the guest to query for features KVM exports.
>
> This patch adds a second return value to the magic mapping that
> indicated to the guest which features are available.
>

You need to make that feature controllable from userspace, to allow 
new->old save/restore.

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