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Re: [Xen-devel] [PATCH 6/8] xen/pvh: Initialize grant table for PVH guests

From Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Newsgroups linux.kernel
Subject Re: [Xen-devel] [PATCH 6/8] xen/pvh: Initialize grant table for PVH guests
Date 2016-10-14 22:00 +0200
Message-ID <ssgOa-5LV-3@gated-at.bofh.it> (permalink)
References <ssffk-4Pd-17@gated-at.bofh.it> <ssffk-4Pd-15@gated-at.bofh.it> <ssgl3-5wE-3@gated-at.bofh.it> <ssgEp-5Iq-5@gated-at.bofh.it>
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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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[PATCH 6/8] xen/pvh: Initialize grant table for PVH guests Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-10-14 20:20 +0200
  Re: [Xen-devel] [PATCH 6/8] xen/pvh: Initialize grant table for PVH  guests Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> - 2016-10-14 21:30 +0200
    Re: [Xen-devel] [PATCH 6/8] xen/pvh: Initialize grant table for PVH  guests Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-10-14 21:50 +0200
      Re: [Xen-devel] [PATCH 6/8] xen/pvh: Initialize grant table for PVH  guests Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> - 2016-10-14 22:00 +0200
        Re: [Xen-devel] [PATCH 6/8] xen/pvh: Initialize grant table for PVH  guests Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-10-14 22:10 +0200
          Re: [Xen-devel] [PATCH 6/8] xen/pvh: Initialize grant table for PVH  guests Juergen Gross <jgross@suse.com> - 2016-10-18 18:10 +0200
            Re: [Xen-devel] [PATCH 6/8] xen/pvh: Initialize grant table for PVH  guests Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-10-18 18:40 +0200
              Re: [Xen-devel] [PATCH 6/8] xen/pvh: Initialize grant table for PVH  guests Juergen Gross <jgross@suse.com> - 2016-10-19 07:50 +0200

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