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. At the very least it has to be documented very well.
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