Re: [libvirt] [Xen-devel] [PATCH RESENT 04/12] libxl: populate xenstore memory entries at startup

>> And to answer you question - libvirt rely on libxl autoballoon. > > Could we introduce something similar to autoballoon=auto to libvirt? > > Maybe we should push down the autoballoon option to libxl: we should > probably rename autoballoon to libxl_memory_management, enable it > automatically during initialization (and call > libxl__fill_dom0_memory_info) unless dom0_mem has been passed as an > option, in which case we would disable it. If we do it at the libxl > level we would cover xl as well as libvirt and also fix the "xl set-mem > 0" case. Looks good for me, but IIUC it's too late for such change in 4.3 and it doesn't qualify for later backport, right? If so, some approach still is needed in libvirt for xen 4.2 and 4.3 (like my simple patch). This still doesn't make libvirt compatible with dom0_mem, but at least cover one (independent) case. Perhaps additionally autoballoon=auto code should be copied from xl to libvirt to cover dom0_mem case with xen 4.2 and 4.3?