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

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

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.

Best regards,
Yang



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