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Use KVM_SET_USER_MEMORY_REGION2 throughout KVM's selftests library so that support for guest private memory can be added without needing an entirely separate set of helpers. Note, this obviously makes selftests backwards-incompatible with older KVM versions from this point forward. Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20231027182217.3615211-26-seanjc@google.com> Reviewed-by: Fuad Tabba <tabba@google.com> Tested-by: Fuad Tabba <tabba@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>