[v3,0/2] fix emulation error on Windows bootup

Message

Jan Dakinevich Aug. 29, 2019, 8:23 a.m. UTC

This series intended to fix (again) a bug that was a subject of the 
following change:

  6ea6e84 ("KVM: x86: inject exceptions produced by x86_decode_insn")

Suddenly, that fix had a couple mistakes. First, ctxt->have_exception was 
not set if fault happened during instruction decoding. Second, returning 
value of inject_emulated_instruction was used to make the decision to 
reenter guest, but this could happen iff on nested page fault, that is not 
the scope where this bug could occur.

v1:
  https://lkml.org/lkml/2019/8/27/881

v2:
  https://lkml.org/lkml/2019/8/28/879

v3:
  - do sanity check in caller code
  - drop patch, that moved emulation_type() function

Jan Dakinevich (2):
  KVM: x86: always stop emulation on page fault
  KVM: x86: set ctxt->have_exception in x86_decode_insn()

 arch/x86/kvm/emulate.c | 2 ++
 arch/x86/kvm/x86.c     | 7 ++++++-
 2 files changed, 8 insertions(+), 1 deletion(-)