Re: Debugging console

[Andrew Cooper <andrew.cooper3@citrix.com>]

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On 28/12/2015 16:30, Carl Patenaude Poulin wrote:
> Hi all,
>
> We've got __HYPERVISOR_console_io working on our unikernel! The only
> issue is that it prints to `xl dmesg`. Is there a way to get it to
> print to `xl console`?

No.  They are two very different consoles.

`xl dmesg` reads the hypervisor console, which is where 
__HYPERVISOR_console_io hypercalls end up (in debug builds of Xen).

`xl console` however is the paravirtual console.  Each domain has a page 
of RAM (the PV console), which is mapped by the xenconsoled daemon in 
dom0.  xenconsoled performs duties such as logging and creation of a pty 
master for two-way interaction.  `xl console` connects to the pty master 
for the appropriate domain.

To get messages appearing in `xl console`, you must implement the guest 
side of the PV console interface.

~Andrew

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