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[Xen-users] Re : Which kernel may I compile ?

  • To: Emmanuel COURCELLE <emmanuel.courcelle@xxxxxxxxxxxxxxxx>, "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: David TECHER <davidtecher@xxxxxxxx>
  • Date: Mon, 2 Jan 2012 15:27:09 +0000 (GMT)
  • Delivery-date: Mon, 02 Jan 2012 15:28:58 +0000
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  • List-id: Xen user discussion <xen-users.lists.xensource.com>

I do not try this but perhaps it could help

cp /boot/config-2.6.32-5-xen-amd64 .config

yes "" | make oldconfig

De : Emmanuel COURCELLE <emmanuel.courcelle@xxxxxxxxxxxxxxxx>
À : xen-users@xxxxxxxxxxxxxxxxxxx
Envoyé le : Lundi 2 Janvier 2012 15h50
Objet : [Xen-users] Which kernel may I compile ?

Hello everybody

We are currently using xen 4.0 on a Debian stable (kernel 2.6.32-5-xen-amd64), it has been working without any trouble for several years.
But now we would like to have a domU with 96Gb memory (paravirtualized, ie NOT hvm)
It is not possible with our kernel, because of the limitation to 32Gb for a domU
So I tried to compile the 3.1.6 kernel, with the following grub.cfg entry:

menuentry "Xen 4.0 KERNEL 3.1.6" {
    insmod ext2
    set root='(hd1,1)'
    multiboot /boot/xen-4.0-amd64.gz dom0_mem=512M dom0_max_vcpus=1 dom0_vcpus_pin loglvl=all guest_loglvl=all
    search --no-floppy --fs-uuid --set xxx
    module /boot/vmlinuz-3.1.6 dummy=dummy root=UUID=xxx ro
    module /boot/initrd.img-3.1.6

This worked well with the 2.6.32 kernel, but I get a panic with the 3.1.6 kernel (cannot find the root FS)
The machine boots correctly the new 3.1.6 kernel when I remove the xen-related entry, so I think my compilation is correct.

Well, here is the question: Which kernel should I compile to drop this 32Gb limitation without upgrading xen itsef ?
(I would want to avoid upgrading to debian testing).

Thanks in advance for your answers !

-- Emmanuel COURCELLE                emmanuel.courcelle@xxxxxxxxxxxxxxxx
L.I.P.M. (UMR CNRS-INRA 2594/441) tel (33) 5-61-28-54-50
B.P.52627 - 31326 CASTANET TOLOSAN Cedex - FRANCE

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