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New virtio balloon...
On Tue, Feb 04, 2014 at 12:00:21PM +1030, Rusty Russell wrote:
> "Michael S. Tsirkin" <[email protected]> writes:
>
> On Mon, Feb 03, 2014 at 01:37:17PM +1030, Rusty Russell wrote:
> >> "Michael S. Tsirkin" <[email protected]> writes:
> >>
> On Fri, Jan 31, 2014 at 04:01:39PM +1030, Rusty Russell wrote:
> >> >> The driver needs to explicitly ask for pages in that region.
> >> >
> >>
> OK so we'll have an extra flag for that?
> >>
> >> No, I mean that the driver explicitly requests every page by PFN. If it
> >> requests a page in the extramem region, it will get one.
> >
>
> Maybe I misunderstand. What is EXTRA_MEM is aid of?
>
> The VIRTIO_BALLOON_F_EXTRA_MEM feature enables the extra memory region.
> It's a simple form of memory hotplug. Daniel wanted it.
>
> It might make sense for some guests to allocate metadata (eg. array of
> struct pages) for that extra memory if it's required.
Linux does this dynamically during memory hotadd phase.
Daniel
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