Re: [PATCH v3 2/3] uio_pci_generic: add MSI/MSI-X support

[Avi Kivity]

On 10/06/2015 05:46 PM, Michael S. Tsirkin wrote:
> On Mon, Oct 05, 2015 at 11:28:03AM +0300, Avi Kivity wrote:
> > Eventfd is a natural enough representation of an interrupt; both kvm and
> > vfio use it, and are also able to share the eventfd, allowing a vfio
> > interrupt to generate a kvm interrupt, without userspace intervention, and
> > one day without even kernel intervention.
> eventfd without kernel intervention sounds unlikely.
>
> kvm might configure the cpu such that an interrupt will not trigger a
> vmexit.  eventfd seems like an unlikely interface to do that: with the
> eventfd, device triggering it has no info about the interrupt so it
> can't send it to the correct VM.

https://lwn.net/Articles/650863/
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