Messages in this thread |  | | Date | Fri, 14 Oct 2016 15:51:34 -0400 | From | Konrad Rzeszutek Wilk <> | Subject | Re: [Xen-devel] [PATCH 6/8] xen/pvh: Initialize grant table for PVH guests |
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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?
Yes.
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).
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