I have attached a patch that will add the capability in the 10_linux grub2 script to detect and generate boot stanzas in grub.cfg for Xen hypervisors (if present). It relies on the presence of CONFIG_XEN_DOM0=y to identify dom0 kernels and pairs them with each version of the hypervisor that is present. It uses the multiboot command for the Xen hypervisor image and the module command for the vmlinuz kernel and initrd.img. It also explicitly sources /etc/default/grub to define a new Xen-only variable called GRUB_CMDLINE_XEN_DEFAULT. The alternative is to export this in /usr/sbin/grub-mkconfig like the other GRUB variables. It will also generate a boot stanza for the dom0 kernel without the hypervisor (in case the hypervisor is broken).
There is a GNU GRUB bug filed on this which is bug #30257: 10_linux ignores
xen hypervisor entries and dom0 kernels.
Here's an example of an actual Xen boot stanza. The dummy=dummy in the
vmlinuz line is needed due to some bug in GRUB or Xen. Without it, the boot
will hang or stop and hit the initramfs (BusyBox) prompt.
/boot/grub/grub.cfg:
menuentry 'xen-4.0 osa-dom0 , with Linux 2.6.32.15-xen' --class osa-dom0
--class gnu-linux --class gnu --class os {
recordfail
insmod lvm
insmod ext2
set root='(system-dom0_0)'
search --no-floppy --fs-uuid --set cc290394-fa2a-4e13-9024-3bc5a5b9215d
multiboot /boot/xen-4.0.gz com1=115200,8n1 console=com1 dom0_mem=512M
dom0_max_vcpus=1 dom0_vcpus_pin=true iommu=1,passthrough,no-intremap
loglvl=all loglvl_guest=all loglevl=10 debug apic=on
apic_verbosity=verbose extra_guest_irqs=80 acpi=force numa=on
module /boot/vmlinuz-2.6.32.15-xen dummy=dummy
root=/dev/mapper/system-dom0_0 ro quiet earlyprintk=xen loglevel=10 debug
acpi=force console=hvc0,115200n8
module /boot/initrd.img-2.6.32.15-xen
}
/etc/default/grub:
GRUB_CMDLINE_XEN_DEFAULT=" com1=115200,8n1 console=com1 dom0_mem=512M
dom0_max_vcpus=1 dom0_vcpus_pin=true iommu=1,passthrough,no-intremap
loglvl=all loglvl_guest=all loglevl=10 debug apic=on
apic_verbosity=verbose extra_guest_irqs=80 acpi=force numa=on"
- Dante Cinco
10_linux.patch
Description: Binary data
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