[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] possible to give/switch direct graphics hw access to doms?
> -----Original Message----- > From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx > [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of > Muli Ben-Yehuda > Sent: 04 May 2006 12:32 > To: Petersson, Mats > Cc: xen-devel@xxxxxxxxxxxxxxxxxxx; Jean Blignaut > Subject: Re: [Xen-devel] possible to give/switch direct > graphics hw access to doms? > > On Thu, May 04, 2006 at 01:26:21PM +0200, Petersson, Mats wrote: > > > The solution is an IOMMU device, which is basicly a > translation system > > to translate a "fake physical" to "actual physical" > address. There is > > a GART in the AMD x86-64 processors that COULD be used for this > > purpose, but currently there's no code to support this [although I > > believe it's being worked on]. > > Does gart provide a 0-based IO space? I don't recall that it > does. Or do you have in mind a scheme where a 0-based IO > address isn't necessary? The GART allows TRANSLATION of DMA-accesses from PCI-space to physical RAM, just like a "proper" IOMMU. I'm sure there are some limitations, and it may not actually work for graphics cards that are able to DMA from just about anywhere in the guest memory space - and the mapping would need to be set up by the hypervisor before-hand, so we can't just map it on a fault in some way or another. I know that we're working on a "proper" IOMMU that will be in some future generation of AMD processors - I don't know which generation these will be in, but it's NOT the ones coming shortly, that's for sure... -- Mats > > Cheers, > Muli > > _______________________________________________ > Xen-devel mailing list > Xen-devel@xxxxxxxxxxxxxxxxxxx > http://lists.xensource.com/xen-devel > > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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