Liran Alon <[email protected]> writes: > So to sum-up: This matches what I mentioned in my previous emails right? > That vector 96 is not related, and the only issue here is that > level-triggered interrupt handler for vector 80 is doing EOI before lowering > the irq-line. > Which cause vector 80 to be injected in infinite loop. > And this is not even related to being a nested virtualization > workload. It’s just an issue in Hyper-V (L1) interrupt handler for > vector 80.
Yes, it may be related to how communications between Hyper-V and Windows partition are organized but it's a pure speculation. > > Therefore the only action-items are: > 1) Microsoft to fix Hyper-V vector 80 interrupt handler to lower irq-line > before EOI. > 2) Patch QEMU IOAPIC implementation to have a mechanism similar to KVM to > delay injection of level-triggered interrupt > in case we are injecting the same interrupt for X times in a row. I'm intended to do 2) and we already let MS know there's an issue. Thanks for your help with the investigation guys! -- Vitaly
