[Xen-API] continuous address space with multiple pages between different domUs

[Michalis R <michrozis@xxxxxxxxx>]

Hi

I want to make a continuous address space between two different guest domains.

In particular I want to make a read/write queue, so that both domains, can have an address where they can memcpy from/to data.

For example:

I want 64k bytes space in kernel to act as a queue.

I thought of allocating 16 pages in one domain (16*PAGE SIZE=64k), grant_foreign_access to foreign guest (so I now have 16 gref id's) and map these gref_ids in foreign guest.

But I have a question:

- How can each side, access the allocated memory as continuous space, and not 16 different spaces?

For one page, i alloc_page(...), and then use addr = page_address(page) so I can memcpy to addr bytes up to 4k long. What about more pages?

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