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Re: [Xen-devel] Load increase after memory upgrade (part2)

>>> On 12.01.12 at 23:06, Sander Eikelenboom <linux@xxxxxxxxxxxxxx> wrote:
> Another thing i was wondering about, couldn't the hypervisor offer a small 
> window in 32bit addressable mem to all (or only when pci passthrough is used) 
> domU's to be used for DMA ?

How would use of such a range be arbitrated/protected? You'd have to
ask for reservation (aka allocation) of a chunk anyway, which is as good
as using the existing interfaces to obtain address restricted memory
(and the hypervisor has a [rudimentary] mechanism to preserve some
low memory for DMA allocations).


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