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

[Julien Grall <julien.grall@xxxxxxx>]

Hi,

Thank you for the new proposal.

On 06/20/2017 06:18 PM, Zhongze Liu wrote:
> In the example above. A memory area ID1 will be shared between vm1 and vm2.
> This area will be taken from vm1 and mapped into vm2's stage-2 page table.
> The parameter "prot=RO" means that this memory area are offered with read-only
> permission. vm1 can access this area using gmfn1~gmfn2, and vm2 using
> gmfn5~gmfn6.
[...]

> ======================================
> 2.3 mapping the memory areas
> ======================================
> Handle the newly added config option in tools/{xl, libxl} and utilize
> toos/libxc to do the actual memory mapping. Specifically, we will use
> a wrapper to XENMME_add_to_physmap_batch with XENMAPSPACE_gmfn_foreign to
> do the actual mapping. But since there isn't such a wrapper in libxc, we'll
> have to add a new wrapper, xc_domain_add_to_physmap_batch in libxc/xc_domain.c
In the paragrah above, you suggest the user can select the permission on 
the shared page. However, the hypercall XENMEM_add_to_physmap does not 
currently take permission. So how do you plan to handle that?
Cheers,

--
Julien Grall

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