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Re: [Xen-devel] pvgrub2 is merged

On Sun, 10 Nov 2013, Andrey Borzenkov wrote:

Ð Sat, 09 Nov 2013 21:52:20 +0100
Vladimir 'Ï-coder/phcoder' Serbinenko <phcoder@xxxxxxxxx> ÐÐÑÐÑ:

Hello, all. pvgrub2 has just became part of upstream grub as ports i386-xen and 

Documentation on its usage is missing for now but in short:
./configure --target=$ARCH --with-platform=xen
mkdir -p boot/grub/
cat > boot/grub/grub.cfg <<EOF
search -s root -f /boot/grub/grub.cfg
configfile /boot/grub/grub.cfg
./grub-mkstandalone --grub-mkimage=./grub-mkimage -o grub.xen -O $ARCH-xen -d 
grub-core/ boot/grub/grub.cfg

Do I understand it correctly that to use grub.xen it is enough to add

kernel = "/path/to/grub.xen"

to guest configuration?

I have found the following problems in doing this;

The instructions are missing a step. You I found I had to do
export pkgdatadir=.
before running ./grub-mkstandalone as otherwise it looks for some files in the installed version of grub2 rather than the build location.

Your script
search -s root -f /boot/grub/grub.cfg
configfile /boot/grub/grub.cfg
only checks one location, and the grub.cfg file can be in other places such as /grub/grub.cfg if there is a separate boot partition, or /boot/grub2/grub.cfg for Fedora. For testing it can be set correctly by hand but more locations would need to be searched for general use.

It doesn't seem to understand sub-partitions. I can get it to work if the boot files are in /dev/xvda but not in /dev/xvda1 .

        Michael Young
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