On 03/04/2015 10:27 AM, Raymond Durand wrote: > I read this in the context of direct device assignment: "All of the > guest's memory must kept permanently in memory. This is because the > guest may program the device with any address in its address space and > the hypervisor has no way of handling a DMA page fault" > > is it still true? > Yes. libvirt takes care of this automatically (by calling setrlimit() or prlimit()) when you assign a device to a guest. It does mean that you'll need enough physical RAM on the machine to account for it, though.