[PATCH v2 0/2] kvm: x86: Convey the exit reason to user-space on emulation failure

[David Edmondson]

To help when debugging failures in the field, if instruction emulation
fails, report the VM exit reason to userspace in order that it can be
recorded.

I'm unsure whether sgx_handle_emulation_failure() needs to be adapted
to use the emulation_failure part of the exit union in struct kvm_run
- advice welcomed.

v2:
- Improve patch comments (dmatlack)
- Intel should provide the full exit reason (dmatlack)
- Pass a boolean rather than flags (dmatlack)
- Use the helper in kvm_task_switch() and kvm_handle_memory_failure()
  (dmatlack)
- Describe the exit_reason field of the emulation_failure structure
  (dmatlack)

David Edmondson (2):
  KVM: x86: Add kvm_x86_ops.get_exit_reason
  KVM: x86: On emulation failure, convey the exit reason to userspace

 arch/x86/include/asm/kvm-x86-ops.h |  1 +
 arch/x86/include/asm/kvm_host.h    |  3 +++
 arch/x86/kvm/svm/svm.c             |  6 ++++++
 arch/x86/kvm/vmx/vmx.c             | 11 +++++++----
 arch/x86/kvm/x86.c                 | 22 +++++++++++++---------
 include/uapi/linux/kvm.h           |  7 +++++++
 6 files changed, 37 insertions(+), 13 deletions(-)

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2.30.2