[PATCH RESEND1 05/12] ALSA: vsnd: Implement Xen event channel handling

From: Oleksandr Andrushchenko 1. Create event channels for all configured streams and publish corresponding ring references and event channels in Xen store, so backend can connect. 2. Implement event channel interrupt handler. 3. Create and destroy event

[PATCH RESEND1 05/12] ALSA: vsnd: Implement Xen event channel handling

From: Oleksandr Andrushchenko 1. Create event channels for all configured streams and publish corresponding ring references and event channels in Xen store, so backend can connect. 2. Implement event channel interrupt handler. 3. Create and destroy event channels with respect to Xen bus state.