Avi Kivity wrote:
> Han, Weidong wrote:
>> Hi all,
>>
>> The initial passthrough/VT-d patches have been in kvm,
>> it's time to enhance it, and push them into 2.6.28.
>>
>> - Shared Interrupt support
>>
>
> Shared guest interrupts is a prerequisite for merging
> into mainline. Without this, device assignment is useless
> in anything but a benchmark scenario. I won't push
> device assignment for 2.6.28 without it.
>
> Shared host interrupts are a different matter; which one
> did you mean?
>
Avi:
How about we think in other way? The top usage model of IOMMU is
SR-IOV in my mind, at least for enterprise usage model. We are pushing
the SR-IOV patch for 2.6.28, and are continuously polishing the patch.
Even if it missed the 2.6.28 merge windows (unlikely?), we could be able
to ask OSVs to take the SR-IOV patch seperately before code froze since
it is very small, but it is hard to ask for taking whole IOMMU patches.
In Xen side, IOMMU is there, MSI-x is there, so SR-IOV patch is
the only one missed to enable SR-IOV. In KVM side, very likely we can
get MSI patch down soon before chinese holiday, and we of course will
spend tons of effort in qualities too. Should we target this? If yes, we
put MSI patch and push 2.6.28 as 1st priority. We would be able to see
next major release of VMM using KVM have HW IO virtualization
technology: Close to native performance, non sacriface of IO sharing,
minimal CPU utilization etc.
For those legacy PCI pass thru support, we can continue improve
it too.
Thanks, eddie
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