Re: Question: Redirect guest kernel's message via serial port to a file on dom0

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

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On 24/08/2015 04:01, Meng Xu wrote:
> Hi,
>
> I'm trying to use a PV guest VM on Xen to help debug Linux.
> I was using VirtualBox to help debug Linux kernel by redirecting the
> output of the serial port of the VM to a file in the host. I can do it
> in VirtualBox.
>
> [Why do I want to achieve this?]
> It is much faster to reboot a VM than rebooting the physical machine.
> I don't need another machine to physically connect to the serial port
> of the development machine.
> I want to use Xen for as many things as possible. ;-)
>
> I tried to google a tutorial or manual about how to configure it, but
> didn't find any. :-(
>
> In my understanding, I need to do the following things:
> 1) I need to add a line (something like "serial=") in the guest's
> configuration file to specify the serial port device to the VM;
> 2) I need some configuration to redirect the output of the serial
> device to a file in domU;
> 3) After that, I can configure the kernel command line in the VM to
> dump the kernel message via the serial port of the VM. (I know how to
> do this step.)
>
> ​Did anyone have tried this before and have some configuration I can
> refer to? or​
> ​Could anyone give me some references that describes how to configure
> the above three steps? ​
>
> I really appreciate any help or suggestion or comment.

Configure xenconsoled to log guest consoles to file "--log=guest" at
which point anything sent to hvc0 will be logged to files in
/var/log/xen/guest/console (configurable with "--log-dir=")

There is usually XENCONSOLED_ARGS= in a configuration file somewhere in
/etc.

~Andrew

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