Re: [Minios-devel] Sharing pages between two mini-os

[Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>]

Ariani A, on lun. 01 mai 2017 15:20:04 -0400, wrote:
> Ok, so could you please do me a favor and  provide a pseudo code for doing
> this? I am totally confused.

        char shared_buffer[PAGE_SIZE];
        
        gref = gnttab_grant_access(DOMID_FRIEND, virt_to_pfn(&shared_buffer), 
0);

then pass gref to the other domain, e.g. through xenstore.

The other domain can then map it:

        struct gntmap map;
        uint32_t domid = DOMID_ORIGIN;
        void *addr;
        
        gntmap_init(&map);
        addr = gntmap_map_grant_refs(&map, 1, &domid, 0, &gref, 0);



and at the end,

        gntmap_munmap(&map, addr, 1);
        gntmap_fini(&map);

and in the origin domain, 

        gnttab_end_transfer(gref);

Samuel

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