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xen-devel
Re: Building domains as a lesser user (was Re: [Xen-devel] boot loaders
Ian Pratt wrote:
One fairly simple option is to use Linux as a domU boot loader. Boot
with an intrd,
mount the specified filesystem, read off grub.conf, display a menu over
the xencons, kexec the appropriate kernel.
I'd have to think through whether kexec would need modifications, but I
believe it uses the same 32 bit kernel entry point that xen/linux does
(no grubby 16bit nastiness).
Yeah, I think kexec would work but unfortunately it's not part of the
kernel yet. It could be folded into Xen but I agree with Jeremy that it
seems like overkill. Boot through Linux just to get to a grub screen
seems a little strange too.
Jacob's two-stage approach would work although it requires a lot of
custom code. It also makes it pretty difficult to support new types of
loaders. And you still have a point of failure with that "trusted"
loader. I don't think you ever really see a graphical boot using this
approach either. Getting a system going with xlibs working would
basically put you back at the kexec() solution.
I've got the user-space boot loader working quite nicely. I want to
test at the systems in the office though so I'll post it sometime
tomorrow. In the very least, it can be used a data point. It seems
like a very appealing solution if the security concerns can be addressed.
Regards,
Anthony Liguori
anthony@xxxxxxxxxxxxx
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