On Wed, Oct 20, 2010 at 06:13:53PM +0200, Avi Kivity wrote: > On 10/20/2010 05:59 PM, Michael S. Tsirkin wrote: > >> > >> One ugly way is to use two eventfds, one counting mask events, one > >> counting unmask events. The difference is the value if the masked > >> bit. > >> > >> Another option is to use > >> http://permalink.gmane.org/gmane.linux.kernel.commits.head/188038 > >> which allows kvm to maintain a counter using eventfd. The vfio > >> state machine then looks like: > >> > >> interrupt: > >> if counter == 0 mask interrupts, set pending bit, wait for counter > >> to become 1 > >> if counter == 1 forward it > >> counter becomes 1: unmask, forward interrupt if pending > > > >One issue is that this page has a ton of other info. > >KVM would have to keep all that in kernel... > > Or we'd make kvm an "accelerator" and pass through other accesses to > userspace. I don't like it because it's a blurry programming model. Not sure I understand. > At the very least it has to be documented very well. > > -- > I have a truly marvellous patch that fixes the bug which this > signature is too narrow to contain. -- 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
