Re: [Xen-devel] [PATCH v7 02/12] x86/mm: add HYPERVISOR_memory_op to acquire guest resources

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 18.09.17 at 17:31, <paul.durrant@xxxxxxxxxx> wrote:
> Certain memory resources associated with a guest are not necessarily
> present in the guest P2M and so are not necessarily available to be
> foreign-mapped by a tools domain unless they are inserted, which risks
> shattering a super-page mapping.

Btw., I'm additionally having trouble seeing this shattering of a
superpage: For one, xc_core_arch_get_scratch_gpfn() could be
a little less simplistic. And then even with the currently chosen
value (outside of the range of valid GFNs at that point in time)
there shouldn't be a larger page to be shattered, as there should
be no mapping at all at that index. But perhaps I'm just blind and
don't see the obvious ...

Jan


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