Re: Remaining passthrough/VT-d tasks list

["Yang, Sheng" <sheng.yang@intel.com>]

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.

--
regards
Yang, Sheng