Re: [Xen-devel] ext4 support on pvgrub

[M A Young <m.a.young@xxxxxxxxxxxx>]

On Thu, 14 Oct 2010, Stefano Stabellini wrote:

> On Tue, 12 Oct 2010, M A Young wrote:
> > On Tue, 12 Oct 2010, Jeremy Fitzhardinge wrote:
> >
> > > On 10/07/2010 02:48 PM, M A Young wrote:
> > > > I have this working on Fedora. It turned out to be very easy to add
> > > > this as I simply took the grub-ext4-support.patch from the Fedora grub
> > > > package and put it in xen-4.0.1/stubdom/grub.patches/ . Using pvgrub
> > > > (without a vif on the virtual machine as I was having problems if I
> > > > did give it a network interface) I could read and boot from ext4
> > > > partition with this patch but not without it.
> > > >
> > > > Is this a good way to add this feature to xen more generally?
> > > Sounds like it just needs to be committed.  Post the patch?
> > I am attaching both the raw patch (taken from grub-0.97-66.fc14, it
> > traces back to the attachment at
> > https://bugzilla.redhat.com/show_bug.cgi?id=486284#c7 with only spelling
> > fixes) and also one that could be applied to the xen source.
> > Use whichever is more convenient or you can fetch it directly from the
> > Fedora source repository at
> > http://pkgs.fedoraproject.org/gitweb/?p=grub.git;a=blob_plain;f=grub-ext4-support.patch;hb=3bcdb10fc21d8e94efa70fd91d21224f13f01433
> I tried out the patch but even though it doesn't introduce any
> regressions it doesn't seem to be able to handle an ext4 partition I
> made for testing purposes.
>
> Can anybody else confirm that it actually works?
It works for me of course (if it sisn't I wouldn't have submitted it). I 
do have the following caveats;
1) I can't use pvgrub with the network enabled - I think it is trying some 
sort of network boot and the system becomes unusably slow. This was true 
before I applied the patch.
2) It didn't load the automatic configuration file. I am not sure whether 
that is expected or not, but I can load it manually from the grubdom> 
prompt, which didn't work before I applied the patch.
        Michael Young

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