Messages in this thread |  | | Subject | Re: [Xen-devel] [PATCH 6/8] xen/pvh: Initialize grant table for PVH guests | From | Boris Ostrovsky <> | Date | Fri, 14 Oct 2016 16:02:52 -0400 |
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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? > 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).
We don't do this for PV though, do we?
-boris
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