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[Xen-users] Looking for a way to share big buffer (>8MB) across different domains without data copy

  • To: xen-users@xxxxxxxxxxxxx
  • From: Dongwon Kim <downor@xxxxxxxxx>
  • Date: Thu, 9 Feb 2017 15:41:43 -0800
  • Delivery-date: Thu, 09 Feb 2017 23:44:05 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>

I am a newbie on Xen development and I am looking for a way to get
pages (frames)
shared among different domains. I saw using a grant-table is a
standard way to do it
by assigning and passing references for pages to be shared to the remote

However, I also saw there's a limitation in terms of size of grant
table, meaning we can
share only certain number of frames (e.g. 32). The buffer I want to
share is way bigger
than this (~8MB), so I think this is pretty big blocker for us. Am I
understanding about this
size limitation correctly?

If this restriction on # of frames is something that can't be easily
removed, I would like
to know if there's any other alternative way to achieve our goal
(sharing big buffer with more
than 2000 pages).


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