x86/cpu/intel: Clear cache self-snoop capability in CPUs with known errata

Processors which have self-snooping capability can handle conflicting
memory type across CPUs by snooping its own cache. However, there exists
CPU models in which having conflicting memory types still leads to
unpredictable behavior, machine check errors, or hangs.

Clear this feature on affected CPUs to prevent its use.

Suggested-by: Alan Cox <[email protected]>
Signed-off-by: Ricardo Neri <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Hans de Goede <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Jordan Borgner <[email protected]>
Cc: "Ravi V. Shankar" <[email protected]>
Cc: Mohammad Etemadi <[email protected]>
Cc: Ricardo Neri <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Peter Feiner <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Link: https://lkml.kernel.org/r/1561689337-19390-2-git-send-email-ricardo.neri-calderon@linux.intel.com

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