[kvm-unit-tests,00/14] x86: MSR_GS_BASE and friends

Message

Sean Christopherson April 22, 2021, 3:04 a.m. UTC

Fix unit tests on 32-bit SVM, and on VMX if/when 32-bit VMX starts
rejecting MSR_GS_BASE accesses.

Fix a variety of semi-related bugs in the MSR test, rework the test to
make the code maintainable, and expand its test coverage.

Sean Christopherson (14):
  x86/cstart: Don't use MSR_GS_BASE in 32-bit boot code
  x86: msr: Exclude GS/FS_BASE MSRs from 32-bit builds
  x86: msr: Advertise GenuineIntel as vendor to play nice with SYSENTER
  x86: msr: Restore original MSR value after writing arbitrary test
    value
  x86: Force the compiler to retrieve exception info from per-cpu area
  x86: msr: Replace spaces with tabs in all of msr.c
  x86: msr: Use ARRAY_SIZE() instead of open coded equivalent
  x86: msr: Use the #defined MSR indices in favor of open coding the
    values
  x86: msr: Drop the explicit expected value
  x86: msr: Add builder macros to define MSR entries
  x86: msr: Pass msr_info instead of doing a lookup at runtime
  x86: msr: Verify 64-bit only MSRs fault on 32-bit hosts
  x86: msr: Test that always-canonical MSRs #GP on non-canonical value
  x86: msr: Verify that EFER.SCE can be written on 32-bit vCPUs

 lib/x86/desc.c      |   6 +-
 lib/x86/processor.h |  24 +++++++
 x86/cstart.S        |  28 ++++++--
 x86/msr.c           | 163 +++++++++++++++++++++-----------------------
 x86/unittests.cfg   |   5 ++
 x86/vmx_tests.c     |   2 -
 6 files changed, 131 insertions(+), 97 deletions(-)