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) This patch set depends on some definition which can be updated from scripts/update-linux-headers.sh. A separate patch set is sent out at https://lists.gnu.org/archive/html/qemu-devel/2022-09/msg02102.html --- Change logs: 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/ 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@xxxxxxxxx/ 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@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 | 48 +++++++++++++++++++++++++++++++++++++++++++ 6 files changed, 109 insertions(+), 1 deletion(-) -- 2.17.1
