This is what's defined in /etc/default/grub following the install of the Xen:
GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=1024M,max:1024M cpuinfo com1=115200,8n1 console=com1,tty loglvl=all guest_loglvl=all" GRUB_CMDLINE_LINUX_XEN_REPLACE_DEFAULT="console=hvc0 earlyprintk=xen nomodeset"
I didn't set these myself, this is what the xen package (or one of its dependencies) is doing.
I'm still not clear on why hvc0 is needed, or why it's being set, but what I do know for sure is it was causing the boot messages to be suppressed.
So the hvc0 is to use the PV console driver to pipe all the messages to the Xen one.
And Xen is configured to use the serial console (com1=115200,8n1).
Which means that all you Linux bootup info should be piped to that.
But Linux is pretty quiet unless you add 'loglevel=10' or 'debug' on the Linux command line.
Thanks, Jerry
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