Re: [Xen-users] Booting pv-ready distro installer.iso as Xen PV DomU drops to grub prompt?

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Wed, 2015-04-15 at 06:48 -0700, lyndat3@xxxxxxxxxxxxx wrote:
> Hi Ian
> 
> On Wed, Apr 15, 2015, at 06:25 AM, Ian Campbell wrote:
> > DomU is completely isolated from Dom0/host as far as any of this stuff
> > is concerned, the guest sees none of the host level stuff here.
> 
> Okay, that's clear. Thanks.
> 
> > There is some sort of grub helper with standalone in the name (can't
> > remember exactly what right now) which I think is a kitchen sink variant
> > of grub-mkimage -- might be the easiest approach.
> 
> There is a grub2-mkstandalone.
> 
> I've seen it used in some posts, but noticed that it was NOT in yours.
> 
> I wasn't sure what the difference was , so just followed your advice.

I wasn't aware of mkstandalone at the time and I was mostly working with
Debian and basing my experiences on that.

> If it's a 'kitchen sink', I'll take another look at it like you suggest.
> 
> > Right, I'd have expected that path to work, but it isn't as convenient
> > as you say.
> 
> I am making an assumption that installing a new PV DomU -- especially
> a clean one from a distro installer iso -- with current pvgrub2 and
> native xl toolstack should be a straightforward and supported use
> case.

It depends on the distro and the format of their ISO, not on Xen itself.
pvgrub2 etc just provides tools which distros can use to make this work.

For an installed distro things are "standard" enough that pvgrub2 will
normally just work, but distro installers have a lot more variation in
how they are setup etc and even on native using grub2 in this context is
fairly new (it's used for UEFI, things tended to use isolinux with old
BIOS).

Ian.
> I understand that not all iso's are even ready for it.  Also pvgrub2,
> or even now-standard grub2, are not widely tested and documented at
> the distros when it comes to DomU.
> 
> I'll get there.
> 
> Thanks again.
> 
> LT



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