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Jan Beulich
bad1ac345b
[1] specifies a long list of instructions which are intended to exhibit timing behavior independent of the data they operate on. On certain hardware this independence is optional, controlled by a bit in a new MSR. Provide a command line option to control the mode Xen and its guests are to operate in, with a build time control over the default. Longer term we may want to allow guests to control this. Since Arm64 supposedly also has such a control, put command line option and Kconfig control in common files. [1] https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/best-practices/data-operand-independent-timing-isa-guidance.html Requested-by: Demi Marie Obenour <demi@invisiblethingslab.com> Signed-off-by: Jan Beulich <jbeulich@suse.com> Acked-by: Roger Pau Monné <roger.pau@citrix.com> Release-acked-by: Henry Wang <Henry.Wang@arm.com>
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