Re: Alloc userspace process to access mapped grant memory regions

[Roger Pau Monné <roger.pau%citrix.com@localhost>]

On 28/11/12 11:13, Manuel Bouyer wrote:
> On Mon, Nov 26, 2012 at 05:51:31PM +0100, Roger Pau Monné wrote:
>> I think it will be easier if there was someway to know the va where the
>> user-space process is going to map the returned pa, but I can't see a
>> way to get this from the mmap handler.
> 
> no, there's not. 
> It may be possible using a /kern node instead of a device node, but I've
> not investigated this.

I've been able to work around this by allocating a memory region in
userspace first (using an anon mmap mapping), and then passing this VA
inside the ioctl, this way I have the VA of the userspace process. I
will try to post a first version later today.