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Introduce CONFIG_HAS_AS_CET_SS to determine whether CET Shadow Stack
instructions are supported in the assembler, and CONFIG_XEN_SHSTK as the main
build option.
Introduce cet={no-,}shstk to for a user to select whether or not to use shadow
stacks at runtime, and X86_FEATURE_XEN_SHSTK to determine Xen's overall
enablement of shadow stacks.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>