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If the current QEMU guest can't wake up from suspend properly, and we are able to determine that, avoid suspending the guest at all. To be able to determine this support, QEMU needs to implement the 'query-current-machine' QMP call. This is reflected by the QEMU_CAPS_QUERY_CURRENT_MACHINE cap. If the cap is enabled, a new function qemuDomainProbeQMPCurrentMachine is called. This is wrapper for qemuMonitorGetCurrentMachineInfo, where the 'wakeup-suspend-support' flag is retrieved from 'query-current-machine'. If wakeupSuspendSupport is true, proceed with the regular flow of qemuDomainPMSuspendForDuration. The absence of QEMU_CAPS_QUERY_CURRENT_MACHINE indicates that we're dealing with a QEMU version older than 4.0 (which implements the required QMP API). In this case, proceed as usual with the suspend logic of qemuDomainPMSuspendForDuration, since we can't assume whether the guest has support or not. Fixes: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1759509 Reported-by: Balamuruhan S <bala24@linux.vnet.ibm.com> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Signed-off-by: Michal Privoznik <mprivozn@redhat.com>