Re: [Xen-devel] [Xenhackthon] Virtualized APIC registers - virtual interrupt delivery.

["Zhang, Yang Z" <yang.z.zhang@xxxxxxxxx>]

Konrad Rzeszutek Wilk wrote on 2013-07-15:
> On Thu, Jun 06, 2013 at 03:08:07AM +0000, Zhang, Yang Z wrote:
>> Stefano Stabellini wrote on 2013-06-05:
>>> On Wed, 5 Jun 2013, Zhang, Yang Z wrote:
>>>>>> Or just split the mechanism. Meaning use the event callback for
>>>>>> "legacy" type events, and for PCI passthrough devices (where the
>>>>>> host supports posted interrupts) just use the baremetal
>>>>>> implementation.
>>>>>> 
>>>>>> That would entail some form of hypercall to identify whether a
>>>>>> PCIe device is "posted-interrupt" candidate and if so don't use
>>>>>> the event channel mechanism for it.
>>>> What you mean "a PCIe device is posted-interrupt candidate"? Do
>>>> you mean
>>> pass-through device will use event channel currently?
>>> 
>>> On Linux, yes: Linux is going to remap the MSI/MSI-X onto an event
>>> channel. Therefore if we want to use posted-interrupts with
>>> pass-through devices we would need to disable event channel
>>> remapping
> for them.
>> Then we must disable event channel remapping if posted interrupt is used.
> 
> When can we expect some of these patches to be posted? Thanks!
Sorry, I don't have much time to work on this. Perhaps it will be delayed.

Best regards,
Yang


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