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Re: [suspend/resume] Debugging via console
On Sun, May 04, 2008 at 05:08:42PM +0200, Jean-Yves Migeon wrote:
> Hi list,
> Is there any way to have access to some debugging console through
> hypervisor for a domU?
> The goal is to have some kind of "failback" access for basic printk()
> operations for debugging purposes, in case xencons device suspend/resume
> goes horribly wrong in a domU.
> There is still the HYPERVISOR_console_io hypercall, but I do not know if
> it is the proper way to do it. BTW, it is restricted to dom0, except
> when Xen is built with debug.
Yes, the proper way to do this is to use HYPERVISOR_console_io().
There are XENPRINTK macros that already do this in the sources
(or you can call printk directly). As you said, this requires a debug
hypervisor, and a serial console (the NetBSD xenkernel3 package provides
a debug hypervisor).
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
NetBSD: 26 ans d'experience feront toujours la difference
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