Re: [Xen-devel] pvgrub2 is merged

[Fabio Fantoni <fabio.fantoni@xxxxxxx>]

Il 28/11/2013 15:05, Vladimir 'Ï-coder/phcoder' Serbinenko ha scritto:
> On 28.11.2013 14:07, Fabio Fantoni wrote:
> > Il 27/11/2013 18:35, Andrey Borzenkov ha scritto:
> > > Ð Wed, 27 Nov 2013 17:24:53 +0100
> > > Fabio Fantoni <fabio.fantoni@xxxxxxx> ÐÐÑÐÑ:
> > >
> > > > Il 27/11/2013 17:03, Vladimir 'Ï-coder/phcoder' Serbinenko ha scritto:
> > > > > On 27.11.2013 16:59, Fabio Fantoni wrote:
> > > > > > Il 27/11/2013 12:50, Vladimir 'Ï-coder/phcoder' Serbinenko ha scritto:
> > > > > > > That pretty much explains what happened: you don't have any
> > > > > > > /boot/grub2/grub.cfg and when looking for /boot/grub/grub.cfg GRUB
> > > > > > > found
> > > > > > > its own memdisk and fell into recursion. I'm not sure what should
> > > > > > > be the
> > > > > > > proper way to solve this recursion.
> > > Yes, it was a bit naive on my side. Recursion in principle can be
> > > stopped by using global variable, but search is limited to the first
> > > match only anyway, so I guess it is not worth it.
> > >
> > > > > > Anyone know how to exclude memdisk from the search please?
> > > Please look in grub2 sources at docs/osdetect.cfg. It implements
> > > advanced run-time detection of possible bootable files from
> > > various operating systems. It boils down to loop across all devices,
> > > and of course you can either limit device names (like looking for hd*
> > > only) or explicitly exclude known ones (like memdisk).
> > >
> > > > Is it possible to specify a different default grub.cfg path (different
> > > > from all other distributions) changing this command:
> > > > ./grub-mkstandalone --grub-mkimage=./grub-mkimage -o pvgrub2.xen -O
> > > > x86_64-xen -d grub-core/ boot/grub/grub.cfg
> > > > Is it hardcoded as /boot/grub/grub.cfg for grub memdisk or can be set?
> > > Not really. Currently the situation is
> > >
> > > - grub-mkstandalone hardcodes $prefix as (memdisk)/boot/grub
> > > - after launch grub unconditionally starts "normal" module if at all
> > >     possible
> > > - normal module always tries to load and execute $prefix/grub.cfg if no
> > >     explicit configuration file name is given as argument
> > >
> > > But I think that using osdetect.cfg or something based on this idea
> > > won't require changing defaults at all.
> > Thanks for your reply.
> >
> > I did this script that is working about finding and include the grub.cfg
> > of pv domUs with many cases:
> >
> > cat > boot/grub/grub.cfg <<EOF
> > insmod lvm
> > insmod ext2
> > insmod part_msdos
> > insmod part_gpt
> > insmod btrfs
> >
> > insmod regexp
> > for dev in (*); do
> >      # $device: parenthesis removed from $dev
> >      regexp -s device '\((.*)\)' $dev
> >      set root=$device
> >      for file in /boot/vmlinuz-* /boot/linux-*; do
> >          if test -f $file; then
> >              set saved_root=$root
> >          fi
> >      done
> > done
> > set root=$saved_root
> >
> > if test -f /boot/grub2/grub.cfg ; then
> >      configfile /boot/grub2/grub.cfg
> > elif test -f /boot/grub/grub.cfg ; then
> >      configfile /boot/grub/grub.cfg
> > fi
> > EOF
> >
> > @xen developer: Are there other modules to insert for other partitions
> > or file systems, other grub cfg path for other distributions or other
> > kernel type to search that support xen pv domUs?
> > I think is good do and post complete pvgrub2 cfg that support all pv domUs.
> >
> > @xen and grub developer: I'm still unable to boot any entry of Sid pv
> > domU using official kernel:
> > xl -vvv create -c /etc/xen/sid.cfg
> > ...
> > Caricamento Linux 3.11-1-amd64...
> > Caricamento ramdisk iniziale...
> > xc: debug: hypercall buffer: total allocations:247 total releases:247
> > xc: debug: hypercall buffer: current allocations:0 maximum allocations:4
> > xc: debug: hypercall buffer: cache current size:4
> > xc: debug: hypercall buffer: cache hits:236 misses:4 toobig:7
> >
> > Any ideas?
> Ah I forgot: you need to "insmod xzio" since debian ones are compressed.
> > If you need more tests/informations tell me and I'll post them.
> >
> > Thanks for any reply.
Thanks for reply, in the meantime I rebuilt updated grub2 from git 
(commit    b67422d33de8eee83700db534a45b2ac5e5ed67a)  and there is a 
regression from build of some days ago (I don't remember the exact 
commit, probably was of 24 or 25 november).
Fails on script I posted on previous mail showing some errors:
> kern/dl.c:619: module name: test
> kern/dl.c:620: init function: 0x3f5abdd4
> error: two arguments expected.
> commands/wildcard.c:164: Regexp is ^vmlinuz-.*$
> commands/wildcard.c:164: Regexp is ^linux-.*$
> error: two arguments expected.
> commands/wildcard.c:164: Regexp is ^vmlinuz-.*$
> commands/wildcard.c:164: Regexp is ^linux-.*$
> error: two arguments expected.
> commands/wildcard.c:164: Regexp is ^vmlinuz-.*$
> commands/wildcard.c:164: Regexp is ^linux-.*$
Full log with debug on attachment.

Attachment: pvgrub2.log
Description: Text document

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