Re: [Xen-devel] [RFC/PATCH v2] XENMEM_claim_pages (subop of existing) hypercall

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 15.11.12 at 13:25, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> Also doesn't this fail to make any sort of guarantee if you are building
> a 32 bit PV guest, since they require memory under a certain host
> address limit (160GB IIRC)?

This case is unreliable already, and has always been (I think we
have a tools side hack in some of our trees in an attempt to deal
with that), when ballooning is used to get at the memory, or
when trying to start a 32-bit guest after having run 64-bit ones
exhausting most of memory, and having terminated an early
created one (as allocation is top down, ones created close to
exhaustion, i.e. later, would eat up that "special" memory at
lower addresses).

So this new functionality "only" makes a bad situation worse
(which isn't meant to say I wouldn't prefer to see it get fixed).

Jan


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