Re: Problems with APIC on versions 4.9 and later (4.8 works)

[Jan Beulich <jbeulich@xxxxxxxx>]

On 20.01.2021 21:13, Claudemir Todo Bom wrote:
> Em qua., 20 de jan. de 2021 às 12:13, Jürgen Groß <jgross@xxxxxxxx> escreveu:
>> On 20.01.21 09:50, Jan Beulich wrote:
>>> I'm afraid there's no real way around seeing the full Xen
>>> messages, i.e. including possible ones while Dom0 already boots
>>> (and allowing some debug keys to be issued, as the rcu_barrier
>>> on the stack may suggest there's an issue with one of the
>>> secondary CPUs). You could try whether "vag=keep" on the Xen
>>> command line allows you to see more, but this option may have
>>> quite severe an effect on the timing of Dom0's booting, which
>>> may make an already bad situation worse.
> 
> already used "vga=keep", no new information. Will try to enable a
> serial output in order to debug more. Is there any parameters I could
> give to Xen in order to it write more information on serial line while
> the dom0 is booting on the screen?

You'll presumably want "console=" and "com<N>="; the exact values
to use depend on your system, so I will refer you to the command
line doc[1].

Jan

[1] https://xenbits.xen.org/docs/unstable/misc/xen-command-line.html