Re: [Xen-devel] Only 1 CPU core detected

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 01.06.12 at 16:27, Killian De Volder <killian.de.volder@xxxxxxxxxx> 
>>> wrote:
> I have a weird problem:
> When I boot Linux get 8 cores (hyper-threading so 4 real cores).
> However if I boot using Xen, i only get 1 cpu core:xl info report: 
> "nr_cpus:1 nr_cores: 1 cores_per_socket:1 threads_per_core: 1"
> Laptop is a ThinkPad w520 with a i7-2860QM with EFI-bios enabled.
> 
> Anyone has any suggestions ?

Please post/attach the complete set of native Linux boot messages,
since ...

> (XEN) Xen version 4.1.2 (root@xxxxxx) (gcc version 4.5.3 (Gentoo 4.5.3-r2 
> p1.1, pie-0.4.7) ) Mon Feb 27 02:14:06 CET 2012
> (XEN) Latest ChangeSet: unavailable
> (XEN) Bootloader: GRUB 1.99
> (XEN) Command line: XEN
> (XEN) Video information:
> (XEN)  VGA is text mode 80x25, font 8x16
> (XEN)  VBE/DDC methods: V2; EDID transfer time: 1 seconds
> (XEN) Disc information:
> (XEN)  Found 0 MBR signatures
> (XEN)  Found 0 EDD information structures
> (XEN) Xen-e820 RAM map:
> (XEN)  0000000000000000 - 000000000009dc00 (usable)
> (XEN)  000000000009dc00 - 00000000000a0000 (reserved)
> (XEN)  00000000000e0000 - 0000000000100000 (reserved)
> (XEN)  0000000000100000 - 0000000020000000 (usable)
> (XEN)  0000000020000000 - 0000000020200000 (reserved)
> (XEN)  0000000020200000 - 0000000040000000 (usable)
> (XEN)  0000000040000000 - 0000000040200000 (reserved)
> (XEN)  0000000040200000 - 00000000da99f000 (usable)
> (XEN)  00000000da99f000 - 00000000dae9f000 (reserved)
> (XEN)  00000000dae9f000 - 00000000daf9f000 (ACPI NVS)
> (XEN)  00000000daf9f000 - 00000000dafff000 (ACPI data)
> (XEN)  00000000dafff000 - 00000000db000000 (usable)
> (XEN)  00000000db000000 - 00000000dfa00000 (reserved)
> (XEN)  00000000f8000000 - 00000000fc000000 (reserved)
> (XEN)  00000000fec00000 - 00000000fec01000 (reserved)
> (XEN)  00000000fed08000 - 00000000fed09000 (reserved)
> (XEN)  00000000fed10000 - 00000000fed1a000 (reserved)
> (XEN)  00000000fed1c000 - 00000000fed20000 (reserved)
> (XEN)  00000000fee00000 - 00000000fee01000 (reserved)
> (XEN)  00000000ffd20000 - 0000000100000000 (reserved)
> (XEN)  0000000100000000 - 000000011e600000 (usable)
> (XEN) ACPI Error (tbxfroot-0220): A valid RSDP was not found [20070126]

... indicates a problem that I would generally assume Linux has
as well (hence it'll be interesting to see how it manages to find
all 8 threads). Subsequently it may become necessary that you
dump and provide the ACPI tables of the system (assuming it
has ACPI, however broken it might be) and/or try out recent
-unstable code.

Btw., unless the log was from a PXE boot on a diskless system,
the two lines following "Disc information:" above indicate further
problems with your BIOS, so I wouldn't be surprised if the issue
you found is firmware related too.

Jan

> (XEN) System RAM: 3979MB (4074740kB)
> (XEN) Domain heap initialised
> (XEN) Table is not found!
> (XEN) Found and enabled local APIC!
> (XEN) Not enabling x2APIC: depends on iommu_supports_eim.
> (XEN) Using scheduler: SMP Credit Scheduler (credit)
> (XEN) Detected 2491.961 MHz processor.
> (XEN) Initing memory sharing.
> (XEN) I/O virtualisation disabled
> (XEN) Enabled directed EOI with ioapic_ack_old on!
> (XEN) Platform timer is 1.193MHz PIT
> (XEN) Allocated console ring of 16 KiB.
> (XEN) VMX: Supported advanced features:
> (XEN)  - APIC MMIO access virtualisation
> (XEN)  - APIC TPR shadow
> (XEN)  - Extended Page Tables (EPT)
> (XEN)  - Virtual-Processor Identifiers (VPID)
> (XEN)  - Virtual NMI
> (XEN)  - MSR direct-access bitmap
> (XEN)  - Unrestricted Guest
> (XEN) EPT supports 2MB super page.
> (XEN) HVM: ASIDs enabled.
> (XEN) HVM: VMX enabled
> (XEN) HVM: Hardware Assisted Paging detected.
> (XEN) Brought up 1 CPUs



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