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

From: Tom Lyon
Date: Thu Apr 01 2010 - 17:29:55 EST

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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