On 2012-03-28 13:09, Avi Kivity wrote: > On 03/22/2012 01:17 AM, Jan Kiszka wrote: >> From: Jan Kiszka <jan.kis...@siemens.com> >> >> This patch basically adds kvm_irqchip_send_msi, a service for sending >> arbitrary MSI messages to KVM's in-kernel irqchip models. >> >> As the current KVI API requires us to establish a static route from a > > s/KVI/KVM/ > >> pseudo GSI to the target MSI message and inject the MSI via toggling >> that GSI, we need to play some tricks to make this unfortunately > > s/unfortunately/unfortunate/
Will fix these. > >> interface transparent. We create those routes on demand and keep them >> in a hash table. Succeeding messages can then search for an existing >> route in the table first and reuse it whenever possible. If we should >> run out of limited GSIs, we simply flush the table and rebuild it as >> messages are sent. >> >> This approach is rather simple and could be optimized further. However, >> it is more efficient to enhance the KVM API so that we do not need this >> clumsy dynamic routing over futures kernels. > > Two APIs are clumsier than one. The current one is very clumsy for user-injected MSIs while the new one won't be. It will also be very simple it implement if you recall the patch. I think that is worth it. > > wet the patch itself, suggest replacing the home grown hash with > http://developer.gnome.org/glib/2.30/glib-Caches.html. Let's keep it simple :). We have no need for many of those features, and it would not be possible to implement the logic as compact as it is right now. Jan -- Siemens AG, Corporate Technology, CT T DE IT 1 Corporate Competence Center Embedded Linux
