Re: [Xen-devel] [PATCH 07 of 10] Transitive grant support

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> Keir Fraser <keir.fraser@xxxxxxxxxxxxx> 05.10.09 10:23 >>>
>On 05/10/2009 09:02, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:
>
>>> -    unsigned long frame;  /* Frame being granted.                     */
>>> +    domid_t       trans_dom;
>>> +    uint32_t      trans_gref;
>>> +    uint32_t      frame;  /* Frame being granted.                     */
>> 
>> Using a uint32_t for a frame number is not valid anymore after the recent
>> sparse physical memory support changes (and I don't think it would have
>> been valid on ia64 even before).
>
>What about the 'uint32_t frame' in grant_entry_v2_t -- I'm surprised you
>didn't mention that also? It's most critical we get the sizing of that

Oops, that one slipped my attention.

>correct, while we're rev'ing a public interface. Given the definition of
>__spacer[], it looks like there's space to have a full 'uint64_t frame' in
>that structure too, no problem. A bit of field reordering might be needed to
>make everything align naturally yet compactly, is all, I think?

Agreed. Not sure though whether uintXX_t is the right thing to use -
after all we have xen_pfn_t for exactly this purpose.

Jan


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