qemu: Adaptive timeout for connecting to monitor
There were couple of reports on the list (e.g. [1]) that guests with huge amounts of RAM are unable to start because libvirt kills qemu in the initialization phase. The problem is that if guest is configured to use hugepages kernel has to zero them all out before handing over to qemu process. For instance, 402GiB worth of 1GiB pages took around 105 seconds (~3.8GiB/s). Since we do not want to make the timeout for connecting to monitor configurable, we have to teach libvirt to count with this fact. This commit implements "1s per each 1GiB of RAM" approach as suggested here [2]. 1: https://www.redhat.com/archives/libvir-list/2017-March/msg00373.html 2: https://www.redhat.com/archives/libvir-list/2017-March/msg00405.htmlSigned-off-by: NMichal Privoznik <mprivozn@redhat.com>
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