Re: [Xen-devel] [PATCH, PV-GRUB DOC] Add details to PV-GRUB documentation

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

On 03/03/2010 02:59 PM, Samuel Thibault wrote:
> According to the ext4 howto, once extents are enabled, the filesystem
> can not be mounted by ext2/3 tools: âIf you convert your root
> filesystem ("/") to ext4, and you use the GRUB boot loader, you will
> need to install a version of GRUB which understands ext4. Your system
> may boot OK the first time, but when your kernel is upgraded, it will
> become unbootable.â
>
> So I guess for now we at least need to document that ext4 is not
> supported.
Yes.  It should also test the filesystem feature flags for features it 
doesn't support and give a useful error message (though I did finally 
work out how to use gdbsx while tracking this down).
>   The long-term plan could probably be to PV-ize grub2 of
> course...
>    
I suppose.  At least Fedora's grub1 supports ext4 (it was the F12 
installer which made this /boot); perhaps pvgrub needs a resync with 
upstream grub?
    J

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