Re: adding /dev/xen/gnttab

[Jean-Yves Migeon <jeanyves.migeon%free.fr@localhost>]

On 04.09.2010 16:37, Thor Lancelot Simon wrote:
> On Sat, Sep 04, 2010 at 12:57:15AM +0200, Jean-Yves Migeon wrote:
>>
>> After a quick look at man pages, there is effectively cdevvp(9) to get a
>> vnode for a char device, and it could be used further through
>> VOP_MMAP(), but it has nothing to do with fdes...
> 
> Right, and this is why you need the gnttab node to be a pseudodevice node,
> because device drivers can implement their own d_mmap entry point.
> 
> However, I don't see why the pseudodevice node cannot be presented in the
> current kernfs namespace, instead of moving everything to /dev/xen right
> away.

kernfs will go away eventually; ad@ removed it initially, but he had to
revert the change because of xentools (which are, IIRC, the last element
needing a working kernfs).

Moving everything to /dev/xen is something that should be done early in
the xentools code: the sooner the code is in, the easier it will be to
move "old" Xen kernfs nodes to /dev later.

-- 
Jean-Yves Migeon
jeanyves.migeon%free.fr@localhost