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

Tom Lyon
2010-04-01T16:06:47Z

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.