On Wed, Mar 25, 2015, at 09:49 AM, Charles Arnold wrote:
> These options are used in /etc/grub.d/20_linux_xen.  Setting these in 
> /etc/default/grub
> and running 'grub2-mkconfig -o /boot/grub2/grub.cfg' should give you what you 
> want.

That was't exactly the question. Or the last question anyway.

Separate options for the -default & -xen kernel lines ARE set with the 
*_REPLACE I found above.

For example setting

GRUB_CMDLINE_LINUX_DEFAULT=" ... clocksource=acpi_pm divider=10 ..."
GRUB_CMDLINE_LINUX_XEN_REPLACE_DEFAULT="... clocksource=xen ..."

enables the two instances to have different clocksources.

Other options can be added & changed similarly.

IIUC the

 GRUB_CMDLINE_LINUX_XEN_REPLACE
 GRUB_CMDLINE_LINUX_XEN_REPLACE_DEFAULT

are not added or mentioned to the out-of-the-box grub2-generated config.  You 
have to know & add them.

LT
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