Re: [Xen-devel] [RFC v2]Proposal to allow setting up shared memory areas between VMs from xl config file

[Zhongze Liu <blackskygg@xxxxxxxxx>]

Hi,

After talking to Stefano, I know that there seem to be no such
hypercalls to restrict the W/R/X
permissions on the shared backing pages (XENMEM_access_op is for
another purpose,
sorry for getting its usage wrong). And it seems that the ability to
specify these permissions
is not strictly necessary. Since the goal of this project is to setup
VM-to-VM communication,
in most cases, users would just expect that the shared memory is
mapped read-write with
cacheability attributes of normal memory. So the temporary conclusion
is to restrict the
design to sharing read-write pages with normal caching attributes,
with the rest left to
the to-be-done list.


Cheers,

Zhongze Liu

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