Debugging console

Debugging console

[Carl Patenaude Poulin]

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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`?

Best

Carl Patenaude Poulin
McGill University

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Re: Debugging console

[quizyjones]

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If you run with Debian and Grub 2 (which should be the case if you are running Squeeze), then you should edit /etc/default/grub as below:GRUB_CMDLINE_XEN="loglvl=all guest_loglvl=all com1=115200,8n1,0x3e8,5 console=com1,vga"
GRUB_CMDLINE_LINUX="console=hvc0 earlyprintk=xen"The above setup of the serial device parameters are for a Supermicro X8STi-F motherboard, where IPMI SOL is configured for COM3 from the BIOS. Note that you need to use "com1=" option for Xen, even when the SOL is actually COM3. If you specify "com3=" for Xen the serial console won't work for some reason. When you are done with your grub config file, do:update-grub2to generate the /boot/grub/grub.cfg
You can go http://wiki.xenproject.org/wiki/Xen_Serial_Console for a complete reference.
In addition, if your guest is a HVM, then you should add serial="pty" into the config file to be able to use 'xl console'
From: carl.patenaudepoulin@mail.mcgill.ca
Date: Mon, 28 Dec 2015 11:30:43 -0500
To: xen-devel@lists.xen.org
Subject: [Xen-devel] Debugging console

Hi all,
We've got __HYPERVISOR_console_io working on our unikernel! The onlyissue is that it prints to `xl dmesg`. Is there a way to get it toprint to `xl console`?
Best
Carl Patenaude PoulinMcGill University

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Re: Debugging console

[Andrew Cooper]

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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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