[Xen-users] How to reuse the grant table memory?

[Wang Cheng]

I'm using the grant table API to share memory between dom0 and domU.

I found the API "xengntshr_share_pages" is to "allocates and shares pages
with another domain" and it returns the local mapping of the pages.
However, I did not find any guide on how to reuse the returned local
mapping of the pages if I want to share it with another domain?

Besides, there is no such API that I manually allocate a page by myself
first (instead of calling xengntshr_share_pages to create a page) and then
share it with multiple domains?