[Xen-devel] [PATCH] Fix xm vcpu-pin command

[Masaki Kanno <kanno.masaki@xxxxxxxxxxxxxx>]

Hi,

When I tested xm vcpu-pin command, I encountered the following strange 
problem.  I encountered it on x86, but I didn't encounter it on ia64. 

On x86:
 # xm vcpu-list
 Name                                ID  VCPU   CPU State   Time(s) CPU Affinity
 Domain-0                             0     0     0   -b-      31.3 any cpu
 Domain-0                             0     1     1   r--      30.1 any cpu
 # xm vcpu-pin Domain-0 0 64
 # xm vcpu-list
 Name                                ID  VCPU   CPU State   Time(s) CPU Affinity
 Domain-0                             0     0     0   -b-      31.5 0
 Domain-0                             0     1     1   r--      31.1 any cpu
 # xm vcpu-pin Domain-0 0 65
 # xm vcpu-list
 Name                                ID  VCPU   CPU State   Time(s) CPU Affinity
 Domain-0                             0     0     1   -b-      32.0 1
 Domain-0                             0     1     0   r--      31.6 any cpu

On ia64:
 # xm vcpu-list
 Name                                ID  VCPU   CPU State   Time(s) CPU Affinity
 Domain-0                             0     0     0   r--      13.2 any cpu
 Domain-0                             0     1     1   -b-      10.8 any cpu
 # xm vcpu-pin Domain-0 0 64
 Error: Cannot pin vcpu: 0 to cpu: [64] - (22, 'Invalid argument')
 Usage: xm vcpu-pin <Domain> <VCPU|all> <CPUs|all>
 
 Set which CPUs a VCPU can use.
 # xm vcpu-list
 Name                                ID  VCPU   CPU State   Time(s) CPU Affinity
 Domain-0                             0     0     0   r--      13.5 any cpu
 Domain-0                             0     1     1   -b-      11.0 any cpu
 # xm vcpu-pin Domain-0 0 65
 Error: Cannot pin vcpu: 0 to cpu: [65] - (22, 'Invalid argument')
 Usage: xm vcpu-pin <Domain> <VCPU|all> <CPUs|all>
 
 Set which CPUs a VCPU can use.
 # xm vcpu-list
 Name                                ID  VCPU   CPU State   Time(s) CPU Affinity
 Domain-0                             0     0     0   r--      13.7 any cpu
 Domain-0                             0     1     1   -b-      11.3 any cpu


I could not understand why the problem occurs.  But I would like to 
solve the problem, so I send an ad hoc patch.  If you can solve the 
problem, I hope that the problem is solved by your patch. 

Signed-off-by: Masaki Kanno <kanno.masaki@xxxxxxxxxxxxxx>

Best regards,
 Kan

Attachment: xm_vcpupin.patch
Description: Binary data

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