[Xen-users] Best way to view pre-kernel output from printk's in Xen hypervisor

[Brett Stahlman <brettstahlman@xxxxxxxxx>]

I'm looking for output from Xen hypervisor itself (e.g., function
__start_xen), prior to its loading dom0. I tried adding loglvl=all to
my grub boot stanza like so:

multiboot /boot/xen.gz placeholder  ${xen_rm_opts} loglvl=all guest_loglvl=all

module /boot/vmlinuz-4.4.0-36-generic placeholder
root=UUID=43b71f62-6154-482f-bf81-925abedd4eae ro single loglvl=all

...but I don't see any print output prior to kernel load in either
/var/log/xen/* or dmesg output. I'm wanting to capture the printk's in
__start_xen in a file, without having to hook up a serial cable...

Thanks,
Brett S.

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