On Wed, 8 Oct 2014, Chris Adams wrote:
> Is there a way to get GRUB2 and the kernel to run a "serial" console
> under KVM?
>
<snip>
This worked for me. Add the following three lines to /etc/default/grub:
GRUB_CMDLINE_LINUX='console=tty0 console=ttyS0,115200n8'
GRUB_TERMINAL=serial
GRUB_SERIAL_COMMAND="serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1"
Then re-generate grub.cfg:
grub2-mkconfig -o /boot/grub2/grub.cfg
Taken from: https://fedoraproject.org/wiki/GRUB_2?rd=Grub2
(near the bottom of the page)