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 2. The corresponding KVM support can be found in linux 6.0-rc: (2f4073e08f4c KVM: VMX: Enable Notify VM exit) This patch set depends on some definition which can be updated from scripts/update-linux-headers.sh. The corresponding separate patch set is available at: https://lists.gnu.org/archive/html/qemu-devel/2022-09/msg02102.html --- Change logs: v6 -> v7 - Add a warning message when exiting to userspace (Peter Xu) - v6: https://lore.kernel.org/all/20220915092839.5518-1-chenyi.qiang@xxxxxxxxx/ v5 -> v6 - Add some info related to the valid range of notify_window in patch 2. (Peter Xu) - Add the doc in qemu-options.hx. (Peter Xu) - v5: https://lore.kernel.org/qemu-devel/20220817020845.21855-1-chenyi.qiang@xxxxxxxxx/ 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@xxxxxxxxx/ 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@xxxxxxxxx/ --- Chenyi Qiang (2): 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 ++++ qemu-options.hx | 10 +++++++- target/i386/cpu.c | 1 + target/i386/cpu.h | 1 + target/i386/kvm/kvm.c | 54 +++++++++++++++++++++++++++++++++++++++++++ 6 files changed, 115 insertions(+), 1 deletion(-) -- 2.17.1
