Re: [Xen-devel] [PATCH 6/8] xen/pvh: Initialize grant table for PVH guests
From: Boris Ostrovsky
Date: Fri Oct 14 2016 - 16:02:40 EST
On 10/14/2016 03:51 PM, Konrad Rzeszutek Wilk wrote:
> On Fri, Oct 14, 2016 at 03:43:19PM -0400, Boris Ostrovsky wrote:
>> On 10/14/2016 03:19 PM, Konrad Rzeszutek Wilk wrote:
>>> On Fri, Oct 14, 2016 at 02:05:16PM -0400, Boris Ostrovsky wrote:
>>> Perhaps add in here:
>>> PVH is like PV in that there are no PCI devices - which HVM
>>> code would piggyback on to find the Xen PCI platform device and
>>> use its MMIO space to stash the grants in.
>>> For PVH we balloon out memory and stash the grants in there.
>>> (Which begs the next question - where and when do we balloon out the
>>> normal memory back in?)
>> Are you saying that we should get back memory that we gave to grant tables?
> In pure HVM that area is MMIO - which hvmloader has balloonned out.
> The hvmloader then balloons that number of pages back at the end of
> guest memory (after 4GB).
We don't do this for PV though, do we?