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

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Message-Id: <201004010840.34574.pugs@lyon-about.com>
Date:	Thu, 1 Apr 2010 08:40:34 -0700
From:	Tom Lyon <pugs@...n-about.com>
To:	Joerg Roedel <joro@...tes.org>
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/1] uio_pci_generic: extensions to allow access for non-privileged processes

On Thursday 01 April 2010 05:52:18 am Joerg Roedel wrote:
> On Wed, Mar 31, 2010 at 05:08:38PM -0700, Tom Lyon wrote:
> > uio_pci_generic has previously been discussed on the KVM list, but this
> > patch has nothing to do with KVM, so it is also going to LKML.
>
> But since you send it to the KVM list it should be suitable for KVM too,
> no?
I know not.

>
> > The point of this patch is to beef up the uio_pci_generic driver so that
> > a non-privileged user process can run a user level driver for most PCIe
> > devices. This can only be safe if there is an IOMMU in the system with
> > per-device domains.  Privileged users (CAP_SYS_RAWIO) are allowed if
> > there is no IOMMU.
>
> If you rely on an IOMMU you can use the IOMMU-API instead of the DMA-API
> for dma mappings. This change makes this driver suitable for KVM use
> too. If the interface is designed clever enough we can even use it for
> IOMMU emulation for pass-through devices.
The use with privileged processes and no IOMMUs is still quite useful, so I'd 
rather stick with the DMA interface.

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