On Wed, Nov 04, 2009 at 01:59:57PM +0100, Andi Kleen wrote: > > Fine? > > I cannot say -- are there paths that could drop the device beforehand? Do you mean drop the mm reference? > (as in do you hold a reference to it?) By design I think I always have a reference to mm before I use it. This works like this: ioctl SET_OWNER - calls get_task_mm, I think this gets a reference to mm ioctl SET_BACKEND - checks that SET_OWNER was run, starts virtqueue ioctl RESET_OWNER - stops virtqueues, drops the reference to mm file close - stops virtqueues, if we still have it then drops mm This is why I think I can call use_mm/unuse_mm while virtqueue is running, safely. Makes sense? > -Andi > -- > ak@xxxxxxxxxxxxxxx -- Speaking for myself only. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
