Re: [Xen-devel] [PATCH v4 1/6] xen: improve changes to xen_add_to_physmap

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 14.09.12 at 15:56, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
>> > > Might we prefer to have a batched version of this call? I don't think
>> > > we can shoehorn the necessary fields into xen_add_to_physmap_t though.
>> > 
>> > Actually, talking about this we Stefano we think we can. Since both idx
>> > and gpfn are unsigned longs they can become unions with a GUEST_HANDLE
>> > without changing the ABI on x86_32 or x86_64.
> 
> Except we need both foreign_domid and size, which currently overlap, and
> there's no other spare bits. Damn.
> 
> Looks like XENMEM_add_to_physmap_range is the only option :-(

You could use the first entry in each array to specify the counts,
which would at once allow mixed granularity on each list (should
that ever turn out useful); initially you would certainly want both
counts to match.

Jan


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