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xen-devel
Re: [Xen-devel] Xen newbie: inter-domain communication
Chotu Ram wrote:
1. As far as I can understand (and I might be wrong) Xen maintains two
domains dom0 (control domain) and dom1 (the other guest OSes). When the
documentation says inter-domain communication, is it only referring to
the communication between the dom0 and dom1, or it can also be applied
to the communication among the guest OSes (unprivileged that is).
A "domain" is a single virtual execution space, more or less. Each
"virtual machine" is a separate domain. (When you do "xm list", the "Id"
field is the "domain ID".) So yes, an inter-domain commmunication
channel can exist between domain 0 and any other domain (running virtual
machine).
2. What are the capabilities of the inter-domain communication method.
Specifically: what protocol is used to communicate?, what kind of
information can be communicated? Can this communication be used for
logging/auditing? Does anybody has any experience using this method or
has any working example?
As I understand, the "protocol" is basically just a per-channel
"interrupt" (to get the other side's attention as needed), and a shared
page, which is exchanged between the two domains as needed (only one can
be interacting with it at a time, I think). The virtual block device
driver and virtual network interface driver, as I understand it,
structure it as a big ring buffer, and encode messages (and assign pages
of their allocated memory to the other side of the channel for a
DMA-like exchange method) in that ring buffer. Look at the developer
documentation for a better explanation.
--
Derrik Pates
dpates@xxxxxxxxxx
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