Re: [Xen-devel] [Xen-users] Only one CPU available to Xen? (nr_cpus : 1)

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 06/03/18 10:04, George Dunlap wrote:
> [Moving over to xen-devel, cc'ing a few people]
>
> On Tue, Mar 6, 2018 at 8:16 AM, John Naggets <hostingnuggets@xxxxxxxxx> wrote:
>> Hi George,
>>
>> You will find the output of "xl dmesg" below. I also managed to
>> reproduce this problem on another test server. That test server is an
>> IBM System x3250 M5 server which uses UEFI. So the hardware is not at
>> fault.
>>
>> Regards,
>> John
>>
>> (XEN) Xen version 4.9.0 (Ubuntu 4.9.0-0ubuntu3)
>> (stefan.bader@xxxxxxxxxxxxx) (gcc (Ubuntu 7.2.0-8ubuntu2) 7.2.0)
>> debug=n  Fri Oct 13 15:58:41 UTC 2017
>> (XEN) Bootloader: GRUB 2.02~beta3-4ubuntu7
>> (XEN) Command line: placeholder dom0_mem=4G,max:4G dom0_max_vcpus=2
>> dom0_vcpus_pin no-real-mode edd=off
>> (XEN) Xen image load base address: 0
>> (XEN) Video information:
>> (XEN)  VGA is text mode 80x25, font 8x16
>> (XEN) Disc information:
>> (XEN)  Found 0 MBR signatures
>> (XEN)  Found 0 EDD information structures
>> (XEN) Multiboot-e820 RAM map:
>> (XEN)  0000000000000000 - 00000000000a0000 (usable)
>> (XEN)  00000000000a0000 - 0000000000100000 (reserved)
>> (XEN)  0000000000100000 - 000000009e3f8000 (usable)
>> (XEN)  000000009e3f8000 - 000000009e568000 (ACPI data)
>> (XEN)  000000009e568000 - 000000009efe1000 (ACPI NVS)
>> (XEN)  000000009efe1000 - 00000000a0117000 (usable)
>> (XEN)  00000000a0117000 - 00000000ab6b9000 (reserved)
>> (XEN)  00000000ab6b9000 - 00000000ab865000 type 20
>> (XEN)  00000000ab865000 - 00000000af3fc000 (usable)
>> (XEN)  00000000af3fc000 - 00000000af42e000 (reserved)
>> (XEN)  00000000af42e000 - 00000000af800000 (usable)
>> (XEN)  00000000af800000 - 00000000d0000000 (reserved)
>> (XEN)  00000000fd000000 - 00000000fe800000 (reserved)
>> (XEN)  00000000fed20000 - 00000000fed45000 (reserved)
>> (XEN)  00000000ff000000 - 0000000100000000 (reserved)
>> (XEN)  0000000100000000 - 0000000840000000 (usable)
>> (XEN) New Xen image base address: 0xaec00000
>> (XEN) ACPI Error (tbxfroot-0217): A valid RSDP was not found [20070126]
> Here's the reason Xen only sees one pcpu: It can't find the ACPI table
> which tells it everything else about the system.
>
> Jan / Boris, any ideas here?

Upgrade Grub to 2.02.

The problem here is that Grub is starting EFI, but doesn't pass the EFI
details to Xen, and Xen therefore cannot locate the RSDP.

Alternatively, switch back to legacy boot, at which point it will all
start working again.

~Andrew

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel