[PATCH v5 0/3] Enable notify VM exit

[Chenyi Qiang <chenyi.qiang@intel.com>]

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 support can be found in linux 6.0-rc1:
(2f4073e08f4c KVM: VMX: Enable Notify VM exit)

---
Change logs:
v4 -> v5
- Remove the assert check to avoid the nop in NDEBUG case. (Yuan)
- v4: https://lore.kernel.org/qemu-devel/20220524140302.23272-1-chenyi.qiang@intel.com/

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):
  Update linux headers to 6.0-rc1
  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 +
 include/standard-headers/asm-x86/bootparam.h  |   7 +-
 include/standard-headers/drm/drm_fourcc.h     |  73 +++++++-
 include/standard-headers/linux/ethtool.h      |  29 +--
 include/standard-headers/linux/input.h        |  12 +-
 include/standard-headers/linux/pci_regs.h     |  30 ++-
 include/standard-headers/linux/vhost_types.h  |  17 +-
 include/standard-headers/linux/virtio_9p.h    |   2 +-
 .../standard-headers/linux/virtio_config.h    |   7 +-
 include/standard-headers/linux/virtio_ids.h   |  14 +-
 include/standard-headers/linux/virtio_net.h   |  34 +++-
 include/standard-headers/linux/virtio_pci.h   |   2 +
 linux-headers/asm-arm64/kvm.h                 |  27 +++
 linux-headers/asm-generic/unistd.h            |   4 +-
 linux-headers/asm-riscv/kvm.h                 |  22 +++
 linux-headers/asm-riscv/unistd.h              |   3 +-
 linux-headers/asm-s390/kvm.h                  |   1 +
 linux-headers/asm-x86/kvm.h                   |  33 ++--
 linux-headers/asm-x86/mman.h                  |  14 --
 linux-headers/linux/kvm.h                     | 172 +++++++++++++++++-
 linux-headers/linux/userfaultfd.h             |  10 +-
 linux-headers/linux/vduse.h                   |  47 +++++
 linux-headers/linux/vfio.h                    |   4 +-
 linux-headers/linux/vfio_zdev.h               |   7 +
 linux-headers/linux/vhost.h                   |  35 +++-
 target/i386/cpu.c                             |   1 +
 target/i386/cpu.h                             |   1 +
 target/i386/kvm/kvm.c                         |  48 +++++
 29 files changed, 623 insertions(+), 83 deletions(-)

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2.17.1