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VMSCAPE is a vulnerability that may allow a guest to influence the branch prediction in host userspace, particularly affecting hypervisors like QEMU. Add the documentation. Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Borislav Petkov (AMD) <bp@alien8.de> Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>