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Hi,
I''m trying to reconstruct a user-level, virtually contiguous space
from guest A to guest B using pages that have been granted.
Is this possible with vmap ? I was thinking something like the following:
guest A:
a) get vaddr from userspace, construct page_list
b) grant each page to guest B (using for instance the following):
for each page:
mfn = pfn_to_mfn(page_to_pfn(page));
gref = gnttab_grant_foreign_access(domid, mfn, 0);
(magically transfer nr_pages and grefs to guest B)
guest B:
c) accept the grants and construct a page_list
for each page:
pages <- {accept grant}
d) create a kernel virtual space that is comprised by the previous
page_list:
vaddr = vmap(page_list, nr_pages, VM_MAP, PAGE_KERNEL);
Is there something I''m missing on the previous scenario?
cheers,
A.
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