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x86/speculation/mds: Add sysfs reporting for MDS
commit 8a4b06d upstream. Add the sysfs reporting file for MDS. It exposes the vulnerability and mitigation state similar to the existing files for the other speculative hardware vulnerabilities. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Borislav Petkov <bp@suse.de> Reviewed-by: Jon Masters <jcm@redhat.com> Tested-by: Jon Masters <jcm@redhat.com> [bwh: Backported to 3.16: - Test x86_hyper instead of using hypervisor_is_type() - Adjust context] Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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