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Andrew Cooper
68d757df8d
This is the start of some performance and security-hardening improvements, based on the fact that 32bit PV guests are few and far between these days. Ring1 is full of architectural corner cases, such as counting as supervisor from a paging point of view. This accounts for a substantial performance hit on processors from the last 8 years (adjusting SMEP/SMAP on every privilege transition), and the gap is only going to get bigger with new hardware features. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Wei Liu <wl@xen.org> Reviewed-by: Roger Pau Monné <roger.pau@citrix.com> Acked-by: Jan Beulich <jbeulich@suse.com>
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