On 13/06/2017 21:28, Radim Krčmář wrote: >> It requires QEMU with the extended test device supporting message end >> event connection test modes (recently posted on qemu-devel). On older >> QEMU versions it fails. > Doesn't QEMU provide a way to detect this feature from the outside (some > command line magic) that we could use it to skip the test? Should we check whether SIGNAL_EVENT returns HV_STATUS_INVALID_HYPERCALL_CODE or HV_STATUS_INVALID_CONNECTION_ID, and if the former skip the test completely? Paolo