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

From: Avi Kivity
Date: Thu Apr 01 2010 - 12:39:58 EST

On 04/01/2010 07:06 PM, Tom Lyon wrote:
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.

But there are multiple msi-x interrupts, how do you know which one triggered?

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.


error compiling committee.c: too many arguments to function

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