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This patch adds support for memory-content hiding, by modifying the value returned by emulated instructions that read certain memory addresses that contain sensitive data. The patch only applies to cases where VM_FLAG_ACCESS_EMULATE has been set to a vm_event response. Signed-off-by: Razvan Cojocaru <rcojocaru@bitdefender.com> Acked-by: Tamas K Lengyel <tlengyel@novetta.com> Reviewed-by: Jan Beulich <jbeulich@suse.com> Acked-by: George Dunlap <george.dunlap@eu.citrix.com> Release-acked-by: Wei Liu <wei.liu2@citrix.com>