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Re: [Xen-devel] [PATCH v9 10/11] common: add a new mappable resource type: XENMEM_resource_grant_table
>>> On 11.10.17 at 11:54, <Paul.Durrant@xxxxxxxxxx> wrote:
>> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
>> Sent: 11 October 2017 10:43
>> Hmm, that would be an option, but I'd prefer if we could get away
>> without. And no, I wasn't suggesting to introduce yet another
>> hypercall. Instead how about the handle being a null one asking
>> for the implementation limit to be returned in nr_frames (or, to
>> keep that IN only, in the re-purposed pad field)?
>>
>
> Ok, I'll make nr_frames IN/OUT. I guess I could define it to be set to the
> implementation limit if the hypercall returns -E2BIG.
Sure, but please don't make this the _only_ way to find out the limit.
Jan
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