linux-kernel - Re: [PATCH] uio_pci_generic does not export memory resources

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Message-ID: <20120610141759.GB8922@redhat.com>
Date:	Sun, 10 Jun 2012 17:18:00 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Alex Williamson <alex.williamson@...hat.com>
Cc:	"Hans J. Koch" <hjk@...sjkoch.de>,
	Andreas Hartmann <andihartmann@...19freenet.de>,
	Dominic Eschweiler <eschweiler@...s.uni-frankfurt.de>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] uio_pci_generic does not export memory resources

On Fri, Jun 08, 2012 at 11:11:16AM -0600, Alex Williamson wrote:
> On Fri, 2012-06-08 at 18:44 +0200, Hans J. Koch wrote:
> > On Fri, Jun 08, 2012 at 06:16:18PM +0200, Andreas Hartmann wrote:
> > > Hi Dominic,
> > > 
> > > Dominic Eschweiler wrote:
> > > > Am Freitag, den 08.06.2012, 08:16 -0600 schrieb Alex Williamson:
> > > >> Yes, thanks Jan.  This is exactly what VFIO does.  VFIO provides
> > > >> secure config space access, resource access, DMA mapping services, and
> > > >> full interrupt support to userspace.  
> > 
> > VFIO is not a "better UIO". It *requires* an IOMMU. Dominic didn't say on
> > what CPU he's working, so it's not clear if he can use VFIO at all.
> > 
> > UIO is intended for general use with devices that have mappable registers
> > and don't fit into any other subsystem. No more, no less.
> 
> VFIO is a secure UIO.

A secure UIO *for VFs*. I think that's why it's called VFIO :).
Other stuff sometimes also works but no real guarantees, though
VFIO tries to make sure you don't burn yourself too badly
if it breaks.

-- 
MST
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