Notify VM exit is introduced to mitigate the potential DOS attach from
malicious VM. This series is the userspace part to enable this feature
through a new KVM capability KVM_CAP_X86_NOTIFY_VMEXIT. The detailed
info can be seen in Patch 3.

The corresponding KVM patches are avaiable at:
https://lore.kernel.org/lkml/20220524135624.22988-1-chenyi.qiang@intel.com/

---
Change logs:
v3 -> v4
- Add a new KVM cap KVM_CAP_TRIPLE_FAULT_EVENT to guard the extension of triple fault
  event save&restore.
- v3: https://lore.kernel.org/qemu-devel/20220421074028.18196-1-chenyi.qiang@intel.com/

v2 -> v3
- Extend the argument to include both the notify window and some flags
  when enabling KVM_CAP_X86_BUS_LOCK_EXIT CAP.
- Change to use KVM_VCPUEVENTS_VALID_TRIPLE_FAULT in flags field and add
  pending_triple_fault field in struct kvm_vcpu_events.
- v2: https://lore.kernel.org/qemu-devel/20220318082934.25030-1-chenyi.qiang@intel.com/

v1 -> v2
- Add some commit message to explain why we disable Notify VM exit by default.
- Rename KVM_VCPUEVENT_SHUTDOWN to KVM_VCPUEVENT_TRIPLE_FAULT.
- Do the corresponding change to use the KVM_VCPUEVENTS_TRIPLE_FAULT
  to save/restore the triple fault event to avoid lose some synthesized
  triple fault from KVM.
- v1: https://lore.kernel.org/qemu-devel/20220310090205.10645-1-chenyi.qiang@intel.com/

---

Chenyi Qiang (3):
  linux-header: update linux header
  i386: kvm: extend kvm_{get, put}_vcpu_events to support pending triple
    fault
  i386: Add notify VM exit support

 hw/i386/x86.c               | 45 +++++++++++++++++++
 include/hw/i386/x86.h       |  5 +++
 linux-headers/asm-x86/kvm.h |  6 ++-
 linux-headers/linux/kvm.h   | 11 +++++
 target/i386/cpu.c           |  1 +
 target/i386/cpu.h           |  1 +
 target/i386/kvm/kvm.c       | 86 ++++++++++++++++++++++++++++---------
 7 files changed, 134 insertions(+), 21 deletions(-)

-- 
2.17.1