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

To: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: Re: [Xen-devel] [PATCH, PV-GRUB DOC] Add details to PV-GRUB documentation
From: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>
Date: Wed, 3 Mar 2010 23:59:34 +0100
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Jeremy Fitzhardinge, le Wed 03 Mar 2010 14:48:47 -0800, a écrit :
> On 03/03/2010 11:45 AM, Samuel Thibault wrote:
> >Add a couple of documentation details about PV-GRUB support
> >
> >- the menu.lst content can be passed as a ramdisk.
> >- virtual partitions are not supported.
> BTW, I had a problem with pvgrub with an ext4 /boot, where it hung 
> indefinitely after starting.  It seemed to be spinning in a readdir loop 
> on a zero-length directory entry.  The directory in question was a 
> single extent.
> Does pvgrub support ext4 /boot?

According to the ext4 howto, once extents are enabled, the filesystem
can not be mounted by ext2/3 tools: “If 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.”

So I guess for now we at least need to document that ext4 is not
supported. The long-term plan could probably be to PV-ize grub2 of


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