The KVM checks already exist. We just need unit tests. Note that this patch builds on top of my last patchset which was, "Test HOST_SYSENTER_ESP and HOST_SYSENTER_EIP fields on vmentry of L2 guests (v3)" [PATCH][kvm-unit-test nVMX]: Check Host Control Registers on vmentry of L2 guests lib/x86/processor.h | 1 + x86/vmx_tests.c | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 78 insertions(+) Krish Sadhukhan (1): nVMX: Check Host Control Registers on vmentry of L2 guests