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Re: adding /dev/xen/gnttab
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
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.
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