[Xen-ia64-devel] dom0-smp issue.

["yo.fujita" <yo.fujita@xxxxxxxxxxxxxxxx>]

Hi

I will report a new issue, which was found by Yongkang at first.

As already reported by Yongkang, we also met the same dom0-smp issue.
Our test environment is as below.

cset          :10700
physical CPUs :3 (2 cores)
HyperThred    :enable

We tried 3 patterns of tests.
The first testing was done with the following parameters in elilo.conf.

append="dom0_max_vcpus=4 com2=115200,8n1 console=com2 sched=bvt
tbuf_size=128 -- nomca console=tty0 console=ttyS1,115200,8n1 rhgb
root=/dev/sda2"

System can boot up. But I can see only 3 CPUs in /proc/cpuinfo.
And "xm vcpu-list" result is below.
[root@tiger158 ~]# xm vcpu-list
Name                              ID  VCPU  CPU  State  Time(s)  CPU
Affinity
Domain-0                           0     0    0   r--     351.5  0
Domain-0                           0     1    1   r--     351.2  any cpu
Domain-0                           0     2    2   r--     350.9  any cpu
Domain-0                           0     3    -   --p       0.0  any cpu

In addition, I tried other test with parameter 8 and 0 of "dom0_max_vcpus=".
Each the results are as below.
#case param 8
[root@tiger158 ~]# xm vcpu-l
Name                              ID  VCPU  CPU  State  Time(s)  CPU
Affinity
Domain-0                           0     0    0   r--     643.4  0
Domain-0                           0     1    1   r--     643.1  any cpu
Domain-0                           0     2    2   r--     642.9  any cpu
Domain-0                           0     3    -   --p       0.0  any cpu
Domain-0                           0     4    -   --p       0.0  any cpu
Domain-0                           0     5    -   --p       0.0  any cpu
Domain-0                           0     6    -   --p       0.0  any cpu
Domain-0                           0     7    -   --p       0.0  any cpu

#case param 0
[root@tiger158 ~]# xm vcpu-l
Name                              ID  VCPU  CPU  State  Time(s)  CPU
Affinity
Domain-0                           0     0    0   r--     176.4  0
Domain-0                           0     1    1   r--     176.1  any cpu
Domain-0                           0     2    2   r--     175.9  any cpu
Domain-0                           0     3    -   --p       0.0  any cpu
Domain-0                           0     4    -   --p       0.0  any cpu
Domain-0                           0     5    -   --p       0.0  any cpu
Domain-0                           0     6    -   --p       0.0  any cpu
Domain-0                           0     7    -   --p       0.0  any cpu
Domain-0                           0     8    -   --p       0.0  any cpu
Domain-0                           0     9    -   --p       0.0  any cpu
Domain-0                           0    10    -   --p       0.0  any cpu
Domain-0                           0    11    -   --p       0.0  any cpu

Through all the tests, active VCPUs are only 3 and others are "p". 
I think xen0 can only recognize the 1st CPU of each physical CPU.

Thanks,
Fujita



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