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Date:	Tue, 6 Oct 2015 17:46:31 +0300
From:	"Michael S. Tsirkin" <>
To:	Avi Kivity <>
Cc:	Greg KH <>,
	Vlad Zolotarov <>,,,,,,,,
Subject: Re: [PATCH v3 2/3] uio_pci_generic: add MSI/MSI-X support

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.

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