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Add a selftest that verifies KVM's ability to save and restore nested state when the L1 guest is using 5-level paging and the L2 guest is using 4-level paging. Specifically, canonicality tests of the VMCS12 host-state fields should accept 57-bit virtual addresses. Signed-off-by: Jim Mattson <jmattson@google.com> Link: https://patch.msgid.link/20251028225827.2269128-5-jmattson@google.com [sean: rename to vmx_nested_la57_state_test to prep nested_<test> namespace] Signed-off-by: Sean Christopherson <seanjc@google.com>