On Wed, 16 May 2007, Avi Kivity wrote:
> IMO doing eventfd_fget() asap is best. I much prefer refcounted pointers to
> handles in the kernel: it's easier to see what things point to, and there is
> to context needed for dereferencing.
There are concerns (from Al and Christoph) about file lifetime tracking of
an fd passed down to the kernel.
Avi, how about you go the other way around? I expose you something like:
long eventfd_create(unsigned int count, void (*release)(void *),
void *priv);
This returns you an eventfd (or error), and lets you install a callback to
be used when the file_operations->release is called (basically, userspace
closed the last file instance).
Can KVM pass back an fd to userspace instead of the other way around?
- Davide
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