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.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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