linux-kernel - Re: [PATCH 0/1] uio_pci_generic: extensions to allow access for non-privileged processes

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Message-Id: <201004011427.07353.pugs@lyon-about.com>
Date:	Thu, 1 Apr 2010 14:27:07 -0700
From:	Tom Lyon <pugs@...n-about.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/1] uio_pci_generic: extensions to allow access for non-privileged processes

On Thursday 01 April 2010 08:54:14 am Avi Kivity wrote:
> On 04/01/2010 06:39 PM, Tom Lyon wrote:
> >>> - support for MSI and MSI-X interrupts (the intel 82599 VFs support
> >>> only MSI-X)
> >>
> >> How does a userspace program receive those interrupts?
> >
> > Same as other UIO drivers - by read()ing an event counter.
>
> IIRC the usual event counter is /dev/uioX, what's your event counter now?
>
> kvm really wants the event counter to be an eventfd, that allows hooking
> it directly to kvm (which can inject an interrupt on an eventfd_signal),
> can you adapt your patch to do this?

I looked further into eventfds - they seem the perfect solution for the 
MSI/MSI-X interrupts. Will include in V2.
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