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From: "Michael S. Tsirkin" <mst@redhat.com>
Subject: Re: [PATCH V3] VFIO driver: Non-privileged user level PCI drivers
Date: Thu, 29 Jul 2010 00:57:39 +0300
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To: Alex Williamson <alex.williamson@redhat.com>
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On Wed, Jul 28, 2010 at 03:57:02PM -0600, Alex Williamson wrote:
> 
> Something like GET_MSIX_VECTORS seems like a user library routine to me.
> The PCI config space is well specified and if we try to do more than
> shortcut trivial operations (like getting the BAR length), we risk
> losing functionality.  And for my purposes, translating to and from a
> made up API to PCI for the guest seems like a pain.

Won't a userspace library do just as well for you?