On 07/12/15 12:39, Big Strong wrote:
I set the xen.efi directly boot without grub2 to be able to list all the cpu cores.
However, after that all the vcpus are in paused state except one for dom0.

~$ sudo xl vcpu-list
Name                                ID  VCPU   CPU State   Time(s) Affinity (Hard / Soft)
Domain-0                             0     0    0   r--      64.7  0 / all
Domain-0                             0     1    -   --p       0.0  1 / all
Domain-0                             0     2    -   --p       0.0  2 / all
Domain-0                             0     3    -   --p       0.0  3 / all
ubuntu-hvm                           1     0    5   -b-      16.9  4-5 / all

The full logs during xen booting is at http://paste.ubuntu.com/13786410/
It looks like some of the ACPI tables are disabled and there is two errors:
"ACPI BIOS Error (bug): A valid RSDP was not found (20131115/tbxfroot-211)
ioapic: probe of 0000:00:05.4 failed with error -22"
I'm not sure if it's a users' problem or dev problem. If I'm wrong, please point it out. Any help will be great appreciated.

Xen itself gets a proper set of ACPI tables and boots sensibly.  However, dom0 fails to retrieve any APCI tables.

dom0 isn't in uniprocessor mode:

[    0.000000] Booting paravirtualized kernel on Xen
[    0.000000] Xen version: 4.6.0 (preserve-AD)
[    0.000000] setup_percpu: NR_CPUS:256 nr_cpumask_bits:256 nr_cpu_ids:1 nr_node_ids:1
[    0.000000] PERCPU: Embedded 29 pages/cpu @ffff880285000000 s86336 r8192 d24256 u2097152

and should be able to bring up its secondary cpus via paravirt methods.


I think it is a bug that dom0 can't see the ACPI tables; Xen should be providing them properly.

However, I think it is also a bug that Linux is unable to start its secondary cpus; it should be able to cope as all PV domU's lack access to ACPI tables.

~Andrew