RE: [Xen-devel] Strange (???) xl behavior for save, migrate and migrate-receive

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2011-10-17 at 19:44 +0100, Dan Magenheimer wrote:
> In a recent internal discussion at Oracle, we were thinking about
> whether to enable hotplug functionality in a guest kernel and it
> raised some concerns about manageability.  I think right now
> the system administrator of the guest can arbitrarily increase
> memory size beyond maxmem...

The memory limit for a guest is ultimately controlled by the host
administrator/toolstack. The in-guest admin cannot exceed that, even
using hotplug. I think that limit is currently always set to the current
balloon target.

AIUI Daniel's work only allows a guest admin to take advantage of new
memory above maxmem _after_ the host admin has provisioned that RAM to
the guest. IOW it only allows the guest to take advantage of new memory
given to it and does not allow the guest to acquire new memory of its
own accord.

Ian.


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