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xen-devel
Re: [Xen-devel] OCaml xenstored
> I think you've overlooked to include a copyright statement or license.
Oops, thanks. Attached is the copyrighted and licensed version (GPL).
Just to make it clear, this is very much a work-in-progress and I've
also added a TODO file outlining what I'm working on now (or will be
soon). I posted before about some of the issues with the current
XenStore daemon implementation. Unfortunately, this initial version of
the OCaml daemon does not address most the concerns. However, it has
improved the performance as now the store is an in-memory tree rather
than a file-backed TDB.
The eventual goal is to have a safe and simple XenStore implementation
that can run either as a dom0 process or in its own domain. The main
issues I'm looking at fixing right now are transactions and supporting
modularised security policies.
I found something interesting while developing. The original protocol
specified that it is conventional that a node should not contain both
data and children. In the proposed cleaned up protocol, I specified that
this property should be enforced (not just conventional).
However, when I enforced it, I found that firing up xend would fail as
there was a node that tried to have both data and children. I had to add
a hack so that this would work. The guilty node is: /vm/image.
Here's an example dump of the vm subtree of XenStore just after xend has
been run:
vm = ""
00000000-0000-0000-0000-000000000000 = ""
on_xend_stop = "ignore"
shadow_memory = "0"
uuid = "00000000-0000-0000-0000-000000000000"
on_reboot = "restart"
image = "(linux (kernel ))"
ostype = "linux"
kernel = ""
cmdline = ""
ramdisk = ""
on_poweroff = "destroy"
on_xend_start = "ignore"
on_crash = "restart"
xend = ""
restart_count = "0"
vcpus = "2"
vcpu_avail = "3"
name = "Domain-0"
I'm not sure if this problem occurs anywhere else, but I think ideally
these would be fixed so that a node does in fact have only data or
children, and never both.
Patrick
Diego Ongaro wrote:
Patrick Colp wrote:
I have completed my first version of said OCaml XenStore daemon, which
I've attached to this message. It contains the source files, Makefile,
and a README.
I think you've overlooked to include a copyright statement or license.
-Diego
xenstored-ocaml.tar.bz2
Description: application/bzip
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