On Wednesday 24 September 2008 17:51:24 Avi Kivity wrote: > Yang, Sheng wrote: > >> 2. shared guest pci interrupts > >> > >> That's a correctness issue. No matter how many interrupts we have, we > >> may have sharing issues. Of course with only three the issue is very > >> pressing since we will get sharing with just a few devices. Currently > >> if two assigned devices share a guest interrupts, or if an emulated > >> device shares an interrupt with an assigned device, things will break. > >> > >> They need to be fixed independently. > > > > About the second issue, I don't understand how it would break... Would > > you please give more details on this? It's a QEmu bug or IOAPIC bug? > > It's a kernel bug. > > Both the device assignment code and KVM_SET_IRQ ioctl() call > kvm_set_irq(), so the last one wins. We need logical-OR mixing between > the various sources. Just like pci_set_irq() in qemu, only for the kernel. > > Userspace is one source, each assigned device irq is a separate source. > I am working on this now.
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