[PATCH 0/3] AMD invpcid exception fix

[Bandan Das <bsd@redhat.com>]

The pcid-disabled test from kvm-unit-tests fails on a Milan host because the
processor injects a #GP while the test expects #UD. While setting the intercept
when the guest has it disabled seemed like the obvious thing to do, Babu Moger (AMD)
pointed me to an earlier discussion here - https://lkml.org/lkml/2020/6/11/949

Jim points out there that  #GP has precedence over the intercept bit when invpcid is
called with CPL > 0 and so even if we intercept invpcid, the guest would end up with getting
and "incorrect" exception. To inject the right exception, I created an entry for the instruction
in the emulator to decode it successfully and then inject a UD instead of a GP when
the guest has it disabled.

Bandan Das (3):
  KVM: Add a stub for invpcid in the emulator table
  KVM: SVM: Handle invpcid during gp interception
  KVM: SVM:  check if we need to track GP intercept for invpcid

 arch/x86/kvm/emulate.c |  3 ++-
 arch/x86/kvm/svm/svm.c | 22 +++++++++++++++++++++-
 2 files changed, 23 insertions(+), 2 deletions(-)

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2.24.1