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

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Date:	Fri, 08 Jun 2012 15:16:57 +0200
From:	Jan Kiszka <jan.kiszka@...mens.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>,
	Dominic Eschweiler <eschweiler@...s.uni-frankfurt.de>
CC:	"Hans J. Koch" <hjk@...sjkoch.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Alex Williamson <alex.williamson@...hat.com>
Subject: Re: [PATCH] uio_pci_generic does not export memory resources

On 2012-06-08 15:03, Michael S. Tsirkin wrote:
>> +    /* set master */
>> +	pci_set_master(pdev);
>> +
>> +    /* set DMA mask */
>> +	err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
> 
> uio currently only supports devices which do not
> do DMA.
> 
> DMA from uio controlled devices is a no no unless
> it's behind an IOMMU which can protect us from
> random memory corruptions this could cause.
> 
> In the later case it's OK but we need some code
> to check this and program the IOMMU appropriately.

AKA: VFIO. :)

Dominic, maybe you want to have a look at Alex's work:
https://github.com/awilliam/linux-vfio

Jan

-- 
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
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