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

[Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>]

Ariani A, on lun. 01 mai 2017 17:57:31 -0400, wrote:
> The mini-os files are complicated, I just want to know the minimal functions
> necessary, could you please select one of the examples and let me know which
> parts/steps are the necessary ones?

See for instance blkfront.c:

dev->ring_ref = gnttab_grant_access(dev->dom,virt_to_mfn(s),0);

it then writes it to xenstore:

err = xenbus_printf(xbt, nodename, "ring-ref","%u", dev->ring_ref);

and at the end, ends access:

gnttab_end_access(dev->ring_ref);


and for the mapping part, see tpmback.c:

page = gntmap_map_grant_refs(&gtpmdev.map, 1, &domid, 0, &ringref, PROT_READ | 
PROT_WRITE)

and

gntmap_munmap(&gtpmdev.map, (unsigned long)tpmif->page, 1);

Samuel

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