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Re: [MirageOS-devel] Passing tap devices to the main module

On 6 Oct 2014, at 11:51, Anil Madhavapeddy <anil@xxxxxxxxxx> wrote:

> On 6 Oct 2014, at 11:43, Richard Mortier <Richard.Mortier@xxxxxxxxxxxxxxxx> 
> wrote:
>> On 5 Oct 2014, at 22:37, Anil Madhavapeddy <anil@xxxxxxxxxx> wrote:
>>> Block devices have another Xenstore numbering scheme that seems far more 
>>> Linux-specific (and afaict, one that only Dave and Mort understand :-)
>> pshaw. it's in the code. plain for all to see. somewhere.
>> (just don't ask me to remember it... :)
>> in a spirit of functorisation, it seems like one should be able to pass in a 
>> function that would generate the next device id as part of the configuration 
>> of a unikernel, rather than embedding it in some backend library (or even 
>> frontend tool). or perhaps that's what providing a device tree would do?
> Yes, but what does 'next' mean here?  What happens if you have three devices 
> simultaneously hotplugged?  They are mostly independent devices with the only 
> connection being the unique identifier that Xenstore gives then (via the 
> backend toolchain), so it seems odd that one device would be required to give 
> the next one (which is potentially running in a completely separate domain) 
> it's identifier.

hm-- yes. 

tbh i think i had several misunderstandings, notably that i was assuming that 
it was the guest's job to register an id for the device in xenstore (under a 
domain prefix) when the device gets hot plugged into the guest, rather than 
xenstore's job to give each device an id that's unique inside the guest.



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