I have a Supermicro Intel Atom based server with UEFI. I purchased the
server in November 2016 intending to run Xen server. I was able
to overcome some problem in 2016 with help from the Xen Project and
I was able to load a xen kernel built in Gentoo for Gentoo VMs manually
using the EFI command. At that time, I was told grub2 was not UEFI ready.
Now I have been trying to integrate grub2 with Xen using kernel version
4.19.23-gentoo. I am witnessing boot attempts that fail at different
points just after calls to setup_local_APIC in apic.c. Sometimes I am
successful in loading the Xen Kernel and then everything goes smoothly
loading the DOM0 session. I can then load the VMs and everything
seems okay. But most of the time, the boot up hangs in
between calls to the function setup_local_APIC in apic.c.
I had posted to the XEN Users list and had little, if any, response.
I have created two bugs within Gentoo's system, differentiated by
xen kernels:
4.11.1 at https://bugs.gentoo.org/679826
4.12.0_rc4 at https://bugs.gentoo.org/680472
What is really vexing is the randomness of results. For instance, here
a log from this morning of success vs. failures:
9:17 AM 3/15/2019 2 (XEN) [2019-03-15 16:17:33] Adding cpu 2 to
runqueue 0
9:18 AM 3/15/2019 5 (XEN) [2019-03-15 16:18:53] Adding cpu 5 to
runqueue 0
9:19 AM 3/15/2019 SUCCESS!!
after * key in serial port for "diagnostics all", shutdown by watchdog.
9:30 AM 3/15/2019 SUCCESS!!
(XEN) [2019-03-15 16:32:54] Hardware Dom0 shutdown: watchdog rebooting
machine
9:34 AM 3/15/2019 Before 1: (XEN) [2019-03-15 16:34:14] HVM: HAP page
sizes: 4kB, 2MB
9:35 AM 3/15/2019 3
9:36 AM 3/15/2019 4 (XEN) [2019-03-15 16:37:21] Adding cpu 4 to
runqueue 0
9:37 AM 3/15/2019 Before 1: (XEN) [2019-03-15 16:38:33] HVM: HAP page
sizes: 4kB, 2MB
9:39 AM 3/15/2019 SUCCESS!!
My attempt to isolate the failure point has been unsuccessful. I'm prepared
to patch 4.12.0_rc4 if that will help, my previous attempt in 4.11.1 only
allowed me to conclude that the problem is not within apic.c.
John Poole
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