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Add an on-by-default module param, error_on_inconsistent_vmcs_config, to allow rejecting the load of kvm_intel if an inconsistent VMCS config is detected. Continuing on with an inconsistent, degraded config is undesirable in the vast majority of use cases, e.g. may result in a misconfigured VM, poor performance due to lack of fast MSR switching, or even security issues in the unlikely event the guest is relying on MPX. Practically speaking, an inconsistent VMCS config should never be encountered in a production quality environment, e.g. on bare metal it indicates a silicon defect (or a disturbing lack of validation by the hardware vendor), and in a virtualized machine (KVM as L1) it indicates a buggy/misconfigured L0 VMM/hypervisor. Provide a module param to override the behavior for testing purposes, or in the unlikely scenario that KVM is deployed on a flawed-but-usable CPU or virtual machine. Note, what is or isn't an inconsistency is somewhat subjective, e.g. one might argue that LOAD_EFER without SAVE_EFER is an inconsistency. KVM's unofficial guideline for an "inconsistency" is either scenarios that are completely nonsensical, e.g. the existing checks on having EPT/VPID knobs without EPT/VPID, and/or scenarios that prevent KVM from virtualizing or utilizing a feature, e.g. the unpaired entry/exit controls checks. Other checks that fall into one or both of the covered scenarios could be added in the future, e.g. asserting that a VMCS control exists available if and only if the associated feature is supported in bare metal. Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20220527170658.3571367-3-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
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