docs: add note about stibp CPU feature for spectre v2
While the stibp CPU feature is not commonly used by guest OS for spectre mitigation due to its performance impact, it is none the less best practice to expose it to all guest OS. This allows the guest OS to decide whether to make use or it. Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com> Message-Id: <20190307121838.6345-3-berrange@redhat.com> Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>
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