Bug#1102066: Xen Dom0 PvGrub2 binary and build instructions

[Nagy Elemér Károly]

Dear All!

I built a PvGrub2 binary (from v. 2.13 commit
ee789e1a625a43b31e17f91a11d4cfb609bc4c52) with Logan Gunthorpe's patch
that can be binary dropped to a Xen Dom0/host to boot a
zstd-compressed Trixie kernel in a DomU/guest.

The file is attached - booting it with
 kernel = "grub-x86_64-xen.2.13_with_zstd_dom0.bin"
from a xl.cfg file boots my test subject.

Build instructions for in-house binaries (preferably in a VM, don't
break your boot loader):
git clone git://git.savannah.gnu.org/grub.git ; cd grub
# Install tools and dependencies - see ./INSTALL
# Apply Logan Gunthorpe's patch (patch --verbose -p1 -i zstdio.patch)
./bootstrap
./autogen.sh
./configure --target=amd64 --with-platform=xen
make
make install
grub-mkimage -O x86_64-xen -c xen.grub.cfg -o
grub-x86_64-xen.2.13_with_zstd_dom0.test.bin -p
/usr/local/lib/grub/x86_64-xen/*.mod

Best wishes:
Elmar
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