lkml.org 
[lkml]   [2016]   [Oct]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [Xen-devel] [PATCH 6/8] xen/pvh: Initialize grant table for PVH guests
From
Date
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

\
 
 \ /
  Last update: 2016-10-14 22:02    [W:0.093 / U:0.156 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site