[Xen-devel] [RFC] [PATCH] Plumb bootloader I/O through xenconsole.

[Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>]

The attached patches change the way the bootloader is called when
creating a PV domain.  Currently, in order to provide an interactive
environment for the bootloader, the bootloader is run by xm create,
using the tty of xm create's caller.  This is a problem when a domain is
rebooted, as there is no equivalent of xm create with a useful tty.

With these patches, Xend always calls the bootloader, and its
interactive I/O is passed through the same pty channel that the domain's
console will use when it is created.

All comments appreciated!

Details:

Patch 1 (ptsname) is a wrapper around the ptsname(3) POSIX library
function, which doesn't appear to be available in python otherwise.

Patch 2 (bootloader-console) makes the following changes:
  - the xenconsole client can handle the domain's console pty changing.
  - xend forwards console traffic between the running bootloader and a pty
    which it writes to the store so the xenconsole client can see it.
  - xend runs the bootloader interactively unless the config file 
    tells it explicitly not to.
  - xm create no longer runs the bootloader.

Yet to come: making "xm console" and "xm create -c" attach early enough
in domain building to see the bootloader (at the moment you need to run
xenconsole by hand for that).

Cheers,

Tim.

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