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@xxxxxxxxx/ --- 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@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 (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
