[0/2] x86/cpuid: expose MCDT_NO

Message

Roger Pau Monné May 13, 2022, 10:34 a.m. UTC

Hello,

First patch is about exposing MCDT_NO when announced by the hardware.
Second patch adds detection in Xen to expose the bit if the
family/model/stepping doesn't expose MCDT behavior.

Document about the feature can be found at:

https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/best-practices/data-operand-independent-timing-isa-guidance.html

Thanks, Roger.

Roger Pau Monne (2):
  x86/cpuid: expose MCDT_NO to guests
  x86/cpuid: set MCDT_NO for non-affected models

 tools/libs/light/libxl_cpuid.c              |  1 +
 tools/misc/xen-cpuid.c                      |  1 +
 xen/arch/x86/cpu/intel.c                    | 70 +++++++++++++++++++++
 xen/arch/x86/cpuid.c                        | 10 +++
 xen/include/public/arch-x86/cpufeatureset.h |  1 +
 5 files changed, 83 insertions(+)