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Smstateen extension provides a mechanism to plug potential covert channels which are opened by extensions that add to processor state that may not get context-switched. Signed-off-by: Mayuresh Chitale <mchitale@ventanamicro.com> Reviewed-by: Xiang W <wxjstz@126.com> Reviewed-by: Anup Patel <anup@brainfault.org>