[ANN] LuaJIT on Xen
- From: Justin Cormack <justin@xxxxxxxxxxxxxxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Sat, 14 Sep 2013 14:31:52 +0100
On Sun, May 5, 2013 at 5:22 AM, Alexander Gladysh <agladysh@xxxxxxxxx> wrote:
> Hi, list!
>
> There are several projects that aim to launch an application framework
> as a Xen VM instance without OS.
>
> For example:
>
> http://erlangonxen.org/
> https://github.com/GaloisInc/HaLVM
>
> (Are there others?)
>
> This kind of feat should be possible with LuaJIT too, and it looks
> like an interesting and potentially very useful project.
OK well the prototype is done for running LuaJIT directly on Xen now.
Thanks to Antti Kantee for doing most of the work.
Essentially this is a build of a modified version of the Xen "Mini-os"
which provides a small stub to handle basic Xen functions like memory
allocation, combined with NetBSD kernel components to provide
networking and file system access if required, plus NetBSD libc to
provide enough to build and run normal C code. Then the build system
creates an executable 'kernel' that Xen can run which combines LuaJIT
and example bytecode-compiled Lua scripts.
The current example compiles the ljsyscall test suite, just to show
how the build works.
Some things are not supported, like fork, exec, dynamic libraries,
mmap other than a small stub.
All code is MIT or BSD licensed.
https://github.com/justincormack/rumpuser-xen
Currently it only works with 32 bit LuaJIT, it needs some fixes to
mmap for 64 bit support. The build process is not very nice, and will
be improved.
You should be able to compile C libraries and add support, the base
environment is much like NetBSD, so most stuff compiles. You can use
the ffi for stuff thats linked into the binary, but you will need to
tweak the (quick hack) ljsyscall/examples/dl.c script which handles
dlsym that the ffi uses, as static linking does not provide dlsym. Ask
for help on github if you have issues.
Justin
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