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

[John Naggets <hostingnuggets@xxxxxxxxx>]

Hello,

I am running Xen 4.9.0 on Ubuntu 17.10 on a new Lenovo ThinkSystem
SR630 server and have noticed that Xen reports only one CPU available.
Is this normal? or is something wrong in my setup?

Here is the output of "xl info":

release                : 4.13.0-32-generic
version                : #35-Ubuntu SMP Thu Jan 25 09:13:46 UTC 2018
machine                : x86_64
nr_cpus                : 1
max_cpu_id             : 0
nr_nodes               : 1
cores_per_socket       : 1
threads_per_core       : 1
cpu_mhz                : 2095
hw_caps                :
bfebfbff:77fef3f7:2c100800:00000121:0000000f:d19ffffb:00000008:00000100
virt_caps              : hvm
total_memory           : 32308
free_memory            : 15534
sharing_freed_memory   : 0
sharing_used_memory    : 0
outstanding_claims     : 0
free_cpus              : 0
xen_major              : 4
xen_minor              : 9
xen_extra              : .0
xen_version            : 4.9.0
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          :
xen_commandline        : placeholder dom0_mem=4G,max:4G
dom0_max_vcpus=2 dom0_vcpus_pin no-real-mode edd=off
cc_compiler            : gcc (Ubuntu 7.2.0-8ubuntu2) 7.2.0
cc_compile_by          : stefan.bader
cc_compile_domain      : canonical.com
cc_compile_date        : Fri Oct 13 15:58:41 UTC 2017
build_id               : 889e50dffcb9ab064c376b1278be0a259e95dd43
xend_config_format     : 4

See under nr_cpus only "1" is available. Also have a look at the
output of "xl vcpu-list" where I have VM1 with 4 vCPUs and VM2 with 1
vCPU:

Name                                ID  VCPU   CPU State   Time(s)
Affinity (Hard / Soft)
Domain-0                             0     0    0   r--  125665.8  all / all
Domain-0                             0     1    -   --p       0.0  all / all
vm2.somefancydomaintest.co          10     0    0   -b-   17377.2  all / all
vm1.somefancydomaintest.co          11     0    0   -b-     617.9  all / all
vm1.somefancydomaintest.co          11     1    0   -b-     630.7  all / all
vm1.somefancydomaintest.co          11     2    0   -b-    1065.0  all / all
vm1.somefancydomaintest.co          11     3    0   -b-     590.2  all / all

Finally here is the output of "lscpu":

Architecture:        x86_64
CPU op-mode(s):      32-bit, 64-bit
Byte Order:          Little Endian
CPU(s):              1
On-line CPU(s) list: 0
Thread(s) per core:  1
Core(s) per socket:  1
Socket(s):           1
NUMA node(s):        1
Vendor ID:           GenuineIntel
CPU family:          6
Model:               85
Model name:          Intel(R) Xeon(R) Silver 4110 CPU @ 2.10GHz
Stepping:            4
CPU MHz:             2095.140
BogoMIPS:            4190.17
Hypervisor vendor:   Xen
Virtualization type: none
L1d cache:           32K
L1i cache:           32K
L2 cache:            1024K
L3 cache:            11264K
NUMA node0 CPU(s):   0
Flags:               fpu de tsc msr pae mce cx8 apic sep mca cmov pat
clflush acpi mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc
rep_good nopl nonstop_tsc cpuid pni pclmulqdq est ssse3 fma cx16
sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand hypervisor
lahf_lm abm 3dnowprefetch intel_ppin fsgsbase bmi1 hle avx2 bmi2 erms
rtm avx512f avx512dq rdseed adx clflushopt clwb avx512cd avx512bw
avx512vl xsaveopt xsavec xgetbv1

Here I should be seeing 2 CPUs as I am using the "dom0_max_vcpus=2
kernel parameter but the output only shows 1.

Any ideas what could be wrong in my setup? or is this normal? I have
the feeling my whole dom0 and domUs are running on a single core...

Best regards,
John

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