From: Tom Lyon <pugs@lyon-about.com>
To: Avi Kivity <avi@redhat.com>
Subject: Re: [PATCH 0/1] uio_pci_generic: extensions to allow access for non-privileged processes
Date: Thu, 1 Apr 2010 09:06:47 -0700
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Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org
References: <201003311708.38961.pugs@lyon-about.com> <201004010839.07451.pugs@lyon-about.com> <4BB4C1A6.8050904@redhat.com>
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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?
Exact same mechanism.

>
> 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?

My patch does not currently go anywhere near the read/fd logic of /dev/uioX.
I think a separate patch would be appropriate.
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