Re: [RFC] Device isolation infrastructure v2
From: David Woodhouse
Date: Mon Dec 19 2011 - 10:47:05 EST
On Mon, 2011-12-19 at 11:11 +1100, David Gibson wrote:
> They have no inbuilt concept
> of domains (though we could fake in software in some circumstances).
That sentence doesn't make much sense to me.
Either you're saying that every device behind a given IOMMU is in *one*
domain (i.e. there's one domain per PCI host bridge), or you're saying
that each device has its *own* domain (maximum isolation, but still
perhaps not really true if you end up with PCIe-to-PCI bridges or broken
hardware such as the ones we've been discovering, where multifunction
devices do their DMA from the wrong function).
Either way, you *do* have domains. You just might not have thought about
it before.
--
dwmw2
Attachment:
smime.p7s
Description: S/MIME cryptographic signature