Re: vcpu state are all paused

[Andrew Cooper <andrew.cooper3@citrix.com>]

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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

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