Control-flow Enforcement Technology (CET) provides protection against 
return/jump-oriented programming (ROP/JOP). It includes two
sub-features: Shadow Stack(SHSTK) and Indirect Branch Tracking(IBT).
This patchset is to enable CET related CPUID report, XSAVES/XRSTORS
support and MSR access etc. for guest.

CET KVM patches:
https://lkml.kernel.org/r/20200506082110.25441-1-weijiang.yang@intel.com

CET kernel patches:
https://lkml.kernel.org/r/20200429220732.31602-1-yu-cheng.yu@intel.com

v5:
  - Checked CET states before access related MSRs.
  - Added new MSR MSR_KVM_GUEST_SSP for live-migration.
  - Refactored patches to make them more structured.

v4:
  - Added MSR read/write interface for PL1_SSP/PL2_SSP.
  - Removed CET structures from X86XSaveArea.
  - Cleared ebx in return of CPUID.(EAX=d, ECX=1).
 
v3:
  - Add CET MSR save/restore support for live-migration.
 
v2:
  - In CPUID.(EAX=d, ECX=1), set return ECX[n] = 0 if bit n corresponds
    to a bit in MSR_IA32_XSS.
  - In CPUID.(EAX=d, ECX=n), set return ECX = 1 if bit n corresponds
    to a bit in MSR_IA32_XSS.
  - Skip Supervisor mode xsave component when calculate User mode
    xave component size in xsave_area_size() and x86_cpu_reset().

Yang Weijiang (4):
  x86/cpu: Add CET CPUID/XSAVES flags and data structures
  x86/cpuid: Add XSAVES feature words and CET related state bits
  x86/cpuid: Add support for XSAVES dependent feature enumeration
  x86/cpu: Add user space access interface for CET MSRs

 target/i386/cpu.c     |  57 ++++++++++++++-
 target/i386/cpu.h     |  53 ++++++++++++++
 target/i386/kvm.c     |  73 +++++++++++++++++++
 target/i386/machine.c | 161 ++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 341 insertions(+), 3 deletions(-)

-- 
2.17.2