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Re: [Xen-devel] Question about mapping between domains

Hi, Ian. Thank You for tips.

On Mon, Jul 13, 2015 at 12:04 PM, Ian Campbell <ian.campbell@xxxxxxxxxx> wrote:
> There is an additional quirk for a 1:1 mapped dom0 which is that we
> don't actually decrease reservation when ballooning, but keep the 1:1
> mfn in anticipation of ballooning it back in later.
Currently we have this quirk enabled in DomD (driver domain)

> If you can't arrange to use already ballooned buffers for your DMA
> buffer then you will need to manually balloon it out before and balloon
> it back in later.
I've tried this and all is working (I can map and then unmap memory in both
directions DomU -> DomD, DomD -> DomU)

> You may also want to extend the dom0 1:1 quirk described above to your
> 1:1 mapped domD.
Currently this quirk is enabled in DomD. In this case I can map memory from
DomU to DomD (as it done in all PV drivers). But is this quirk is
enabled in DomU,
I can also map memory from DomD to DomU.

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