Re: [Xen-devel] Is: PVH - how to solve maxmem != memory scenario? Was:Re: [PATCH] libxl: create PVH guests with max memory assigned

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 05.08.14 at 17:40, <konrad.wilk@xxxxxxxxxx> wrote:
> There is a tiny problem with PoD: PCI passthrough.
> 
> Right now we don't allow PoD + PCI until the hardware allows it
>  (if it ever will).

But PVH doesn't support pass-through so far, does it?

> Thought for PV we do allow ballooning and PCI passthrough as we can
> at least control that the pages that are being ballooned are not going
> to be used for DMA operations (unless the guest does something stupid
> and returns an page back to the allocated but still does DMA ops on 
> the PFN).

And it would seem possible to permit the combination for PVH if
there was a documented requirement for the ballooning down to
happen before any device I/O starts.

Jan


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