Allow to configure maximum memory size per VM. The value should default to 4x memory size. Currently max mem size is set by global config values VM32BitMaxMemorySizeInMB, VM64BitMaxMemorySizeInMB and VMPpc64BitMaxMemorySizeInMB to 1048576MB which prevents hot memory unplug from working.
Verify with: Red Hat Virtualization Manager Version: 4.1.1.3-0.1.el7 Host: OS Version:RHEL - 7.3 - 7.el7 Kernel Version:3.10.0 - 550.el7.x86_64 KVM Version:2.6.0 - 28.el7_3.3.1 LIBVIRT Version:libvirt-2.0.0-10.el7_3.5 VDSM Version:vdsm-4.19.7-1.el7ev SPICE Version:0.12.4 - 20.el7_3 run test plan all pass