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

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

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.

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