Intel client processors that support the IA32_TSX_FORCE_ABORT MSR
related to perf counter interaction [1] received a microcode update that
deprecates the Transactional Synchronization Extension (TSX) feature.
The bit FORCE_ABORT_RTM now defaults to 1, writes to this bit are
ignored. A new bit TSX_CPUID_CLEAR clears the TSX related CPUID bits.

The summary of changes to the IA32_TSX_FORCE_ABORT MSR are:

  Bit 0: FORCE_ABORT_RTM (legacy bit, new default=1) Status bit that
  indicates if RTM transactions are always aborted. This bit is
  essentially !SDV_ENABLE_RTM(Bit 2). Writes to this bit are ignored.

  Bit 1: TSX_CPUID_CLEAR (new bit, default=0) When set, CPUID.HLE = 0
  and CPUID.RTM = 0.

  Bit 2: SDV_ENABLE_RTM (new bit, default=0) When clear, XBEGIN will
  always abort with EAX code 0. When set, XBEGIN will not be forced to
  abort (but will always abort in SGX enclaves). This bit is intended to
  be used on developer systems. If this bit is set, transactional
  atomicity correctness is not certain. SDV = Software Development
  Vehicle (SDV), i.e. developer systems.

Performance monitoring counter 3 is usable in all cases, regardless of
the value of above bits.

Add support for a new CPUID bit - CPUID.RTM_ALWAYS_ABORT (CPUID 7.EDX[11])
 - to indicate the status of always abort behavior.

[1] [ bp: Look for document ID 604224, "Performance Monitoring Impact
      of Intel Transactional Synchronization Extension Memory". Since
      there's no way for us to have stable links to documents... ]

 [ bp: Massage and extend commit message. ]
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Tested-by: Neelima Krishnan <neelima.krishnan@intel.com>
Link: https://lkml.kernel.org/r/9add61915b4a4eedad74fbd869107863a28b428e.1623704845.git-series.pawan.kumar.gupta@linux.intel.com