Re: [Xen-devel] [PATCH 2/9] vm_event: Define VM_EVENT type

[Tamas K Lengyel <tamas@xxxxxxxxxxxxx>]

> >  /* XEN_DOMCTL_mem_sharing_op.
> > - * The CONTROL sub-domctl is used for bringup/teardown. */
> > + * The CONTROL sub-domctl is used for bringup/teardown.
> > + * Please note that mem sharing can be turned on *without* setting-up the
> > + * correspondin ring
> > + */
>
> As a tangent, it can? how?  (I'm entirely prepared to believe that this
> is how the code currently works, but I can't see how such a setup would
> plausibly work.)

The vm_event ring for mem_sharing is only used to communicate
out-of-memory condition to an external listener. I think it's only
useful for logging since the listener wouldn't really be in a position
to try to "make space" for the faulting domain and it would get
destroyed after the message is sent. In any case, there isn't any
documentation for how it was intended to be used so this is just my
guess.

Tamas

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel