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

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Message-ID: <20151005094932.GA5236@kroah.com>
Date:	Mon, 5 Oct 2015 10:49:32 +0100
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Avi Kivity <avi@...lladb.com>
Cc:	Vlad Zolotarov <vladz@...udius-systems.com>,
	linux-kernel@...r.kernel.org, mst@...hat.com, hjk@...sjkoch.de,
	corbet@....net, bruce.richardson@...el.com,
	avi@...udius-systems.com, gleb@...udius-systems.com,
	stephen@...workplumber.org, alexander.duyck@...il.com
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:
> Of course it has to be documented, but this just follows vfio.
> 
> 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.

That's nice and wonderful, but it's not how UIO works today, so this is
now going to be a mix and match type interface, with no justification so
far as to why to create this new api and exactly how this is all going
to be used from userspace.

Example code would be even better...

thanks,

greg k-h
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