On 10/19/2012 07:48 PM, Blue Swirl wrote: >>> >>> DIMMs would be allowed to be hotplugged in the generic mem-controller scheme only >>> (unless it makes sense to allow hotplug in the remaining pmc DRBs and >>> start using the generic scheme once we run out of emulated DRBs) >>> >> >> 440fx seems a lost cause, so we can go wild and just implement pv dimms. > > Maybe. But what would be a PV DIMM? Do we need any DIMM-like > granularity at all, instead the guest could be told to use a list of > RAM regions with arbitrary start and end addresses? Guests are likely to support something that has the same constraints as real hardware. If we allow non-power-of-two DIMMs, we might find that guests don't support them well. > Isn't ballooning > also related? It is related in that it is also a memory hotplug technology. But ballooning is subtractive and fine-grained where classic hotplug is additive and coarse grained. We can use both together, but I don't think any work is needed at the qemu level. > >> For q35 I'd like to stay within the spec. > > That may not last forever when machines have terabytes of memory. At least there's work for chipset implementers. Or we can do PV-DIMMs for q35 too. -- error compiling committee.c: too many arguments to function -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
