Re: [Xen-devel] blkback feature announcement

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 08.12.15 at 02:08, <bob.liu@xxxxxxxxxx> wrote:
> On 12/07/2015 08:42 PM, Roger Pau Monnà wrote:
>> El 07/12/15 a les 13.00, Jan Beulich ha escrit:
>>> Hello,
>>>
>>> is there a particular reason why "max-ring-page-order" gets written in
>>> xen_blkbk_probe(), but e.g. "feature-max-indirect-segments" and
>>> "feature-persistent" get written only in connect(), despite both having
>>> constant values (and hence the node value effectively being known as
>>> soon as the device exists)?
>> 
>> No, AFAIK there's no specific reason.
>> 
> 
> AFAIR, that's for the blkfront resume path.
> 
> We need to get the "max-ring-page-order" in blkfront_resume() in advance, so 
> that we can know how many ring pages to be used before setup_blkring().

I don't follow - the proposal is to have the backend announce the
feature _earlier_, so how could frontend resume be affected?

Jan

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