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

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Date:	Fri, 08 Jun 2012 18:16:18 +0200
From:	Andreas Hartmann <andihartmann@...19freenet.de>
To:	Dominic Eschweiler <eschweiler@...s.uni-frankfurt.de>
CC:	Alex Williamson <alex.williamson@...hat.com>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	"Hans J. Koch" <hjk@...sjkoch.de>,
	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

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.  
> 
> I know about VFIO, but we need some support for that stuff relatively
> soon. That's the reason why I'm currently working on it to make UIO DMA
> capable. My extensions probably do not play well with IOMMUs and they
> therefore won't make it to mainline anyhow (i learned that today ;-).

I'm not sure if vfio covers your needs completely, but I tested it here
very successfully. I was able to create a patch, which can be applied to
opensuse 3.4.1 kernel and which seams to run well.

I even managed to integrate it into libvirt :-). So it is usable as
every other traditional VM, too.

Besides the problem with AMD IOMMU, which requires to unbind a whole
group of devices in some cases (PCI passthrough - not PCIe), it's really
cool! And it's usable now!


Regards,
Andreas
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