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Re: [Xen-devel] Backend in user space, how is its kernel dev unregistere

To: Markus Armbruster <armbru@xxxxxxxxxx>
Subject: Re: [Xen-devel] Backend in user space, how is its kernel dev unregistered?
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Wed, 04 Mar 2009 22:29:16 +0000
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On 04/03/2009 19:51, "Markus Armbruster" <armbru@xxxxxxxxxx> wrote:

>>> But what if the device driver is in user space?  vfb and vkbd are.  I
>>> can't see how their kernel devices can ever get unregistered.
>> 
>> Presumably these should watch xenstore themselves and tear down state when
>> they see state changes from the frontend, or the corresponding xenstore
>> directory disappear completely. Just like in the kernel's xenbus_probe.c.
>> 
>>  -- Keir
> 
> Stupid question: how can a user space driver get *kernel* devices
> unregistered?

Maybe I misunderstand the problem. I don't know much about pvfb or pvkbd.

 -- Keir



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