x86/cpufeature: Add feature bit for Intel's Silicon Debug CPUID bit
Add a CPUID feature bit for the SDBG (Silicon Debug) CPU feature found on recent Intel systems starting with Haswell. Using the IA32_DEBUG_INTERFACE MSR (index C80H) one can at least detect if SDBG has been enabled by the firmware and if it has been used or not. Signed-off-by:Mathias Krause <minipli@googlemail.com> Signed-off-by:
Borislav Petkov <bp@suse.de> Cc: Aaron Lu <aaron.lu@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Dirk Brandewie <dirk.j.brandewie@intel.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1437330403-12102-1-git-send-email-minipli@googlemail.com Signed-off-by:
Ingo Molnar <mingo@kernel.org>
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b51ef52d
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