Re: [Xen-devel] Booting NetBSD in pygrub

["M. Boerschig" <code+mlist@xxxxxxxxxxxxx>]

On 09/09/13 14:35, Ian Campbell wrote:
> On Sat, 2013-09-07 at 11:56 +0000, M. Boerschig wrote:
> I think this implies a Linux dom0?
Yes, of course. I didn't even get a recent xen (> 4.2) to compile on my 
NetBSD machine.
> I imagine this is equally broken with a Linux domU, because it doesn't
> seem likely to be guest specific, given that it is mostly before the
> guest runs...
An Ubuntu domU works on this same machine, so I think this problem is 
limited to my use case (or a similar one, like solaris)
> This stuff ha been a bit fragile in the past, I wouldn't be too
> surprised if it had regressed, especially since it isn't especially
> amenable to automated testing.
>
> What is supposed to happen is that pygrub gets launched attached to a
> pty, and that ptr gets written to xenstore such that the xenconsole
> client connects to it and presents the pygrub output to the user as if
> it were the guest console, xl acts as a pump copying data back and forth
> between the console pty and pygrubs pty (since both console and pygrub
> expect to be a slave). Much of this code is in libxl_bootloader.c.
>
> Once pygrub exits this pty disappears and the console client should
> reattach to the real guest console pty, which is provided by
> xenconsoled.
>
> It sounds like that first connection is not going to the right place or
> is otherwise broken.
>
> Are you seeing the pygrub menu? DO you expect to? Perhaps the automatic
> exit of the first session is not working?
No, and I didn't expect a menu to appear.
I assumed a menu is only displayed if the run_grub()-method succeeds in 
finding a valid GRUB menu.lst/config on the disk.
I used the sniff_solaris() code as a guideline: if I understand the code 
correctly it just returns a configuration dictionary without displaying 
anything.
> The last relevant looking commit to libxl_bootloader.c was
> 7253e0fd1aeb3ae7d4714bcc1d86b846b3331995 which looks like the sort of
> thing which might accidentally introduce such behaviour.
Thanks for the pointer, I'll investigate if pygrub's exit is properly 
handled later this week.
> > Any help appreciated.
> >
> > [1] http://mail-index.netbsd.org/port-xen/2013/09/02/msg008020.html
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxx
> > http://lists.xen.org/xen-devel

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