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

[Claudemir Todo Bom <claudemir@xxxxxxxxxxx>]

Em sex., 29 de jan. de 2021 às 13:24, Jan Beulich <jbeulich@xxxxxxxx> escreveu:
>
> On 28.01.2021 14:08, Claudemir Todo Bom wrote:
> > Em qui., 28 de jan. de 2021 às 06:49, Jan Beulich <jbeulich@xxxxxxxx> 
> > escreveu:
> >>
> >> On 28.01.2021 10:47, Jan Beulich wrote:
> >>> On 26.01.2021 14:03, Claudemir Todo Bom wrote:
> >>>> If this information is good for more tests, please send the patch and
> >>>> I will test it!
> >>>
> >>> Here you go. For simplifying analysis it may be helpful if you
> >>> could limit the number of CPUs in use, e.g. by "maxcpus=4" or
> >>> at least "smt=0". Provided the problem still reproduces with
> >>> such options, of course.
> >>
> >> Speaking of command line options - it doesn't look like you have
> >> told us what else you have on the Xen command line, and without
> >> a serial log this isn't visible (e.g. in your video).
> >
> > All tests are done with xen command line:
> >
> > dom0_mem=1024M,max:2048M dom0_max_vcpus=4 dom0_vcpus_pin=true
> > smt=false vga=text-80x50,keep
> >
> > and kernel command line:
> >
> > loglevel=0 earlyprintk=xen nomodeset
> >
> > this way I can get all xen messages on console.
> >
> > Attached are the frames I captured from a video, I manually selected
> > them starting from the first readable frame.
>
> I've just sent a pair of patches, with you Cc-ed on the 2nd one.
> Please give that one a try, with or without the updated debugging
> patch below. In case of problems I'd of course want to see the
> output from the debugging patch as well. I think it's up to you
> whether you also use the first patch from that series - afaict it
> shouldn't directly affect your case, but I may be wrong.

I've applied both patches, system didn't booted, used following parameters:

xen: dom0_mem=1024M,max:2048M dom0_max_vcpus=4 dom0_vcpus_pin=true smt=true
kernel: loglevel=3

The screen cleared right after the initial xen messages and frozen
there for a few minutes until I restarted the system.

I've added "vga=text-80x25,keep" to the xen command line and
"nomodeset" to the kernel command line, hoping to get some more info
and surprisingly this was sufficient to make system boot!

System prompt took a lot to appear, the kernel driver for the usb
keyboard loaded after 3 minutes and the driver for the usb wifi dongle
I am using loaded about five minutes after kernel boot, and I had to
issue "ifup -a" to get an ip address from the dhcp server, and it took
almost one minute to get it!

Also, the system became very sensible for the keyboard, a lot of
double-typing happening with it, console beeps keeps sounding longer
also.

Then with the debug patch, since it booted I was able to get the "xl
dmesg" output with all the debug messages, it is attached. I'm also
attaching the dmesg output also, but I do not know if it is useful in
any form. Kernel started to boot at stamp ~20 of the xen hypervisor.

Hope all of this helps!

Attachment: xen-dmesg.txt
Description: Text document

Attachment: kernel-dmesg.txt
Description: Text document