[Libvir] [PATCH] an irregular value is set as 'CPU Affinity' by virsh vcpupin
Saori Fukuta
fukuta.saori at jp.fujitsu.com
Tue Jan 8 09:42:40 UTC 2008
Hi,
There is a difference between 'CPU Affinity' of 'virsh vcpuinfo' and
'CPU Affinity' of 'xm vcpu-list' when I set the vcpu affinity by
'virsh vcpupin'. i.e. 'xm vcpu-list' shows wrong value.
But there is no difference between them when I set by 'xm vcpu-pin'.
(a) set by 'virsh vcpupin'
# virsh vcpupin guest_dom 0 1
# virsh vcpuinfo guest_dom
VCPU: 0
CPU: 1
State: blocked
CPU time: 17.1s
CPU Affinity: -y------
# xm vcpu-list guest_dom
Name ID VCPUs CPU State Time(s) CPU Affinity
guest_dom 13 0 1 -b- 17.1 any cpu
(b) set by 'xm vcpu-pin'
# xm vcpu-pin guest_dom 0 0
# virsh vcpuinfo guest_dom
VCPU: 0
CPU: 0
State: blocked
CPU time: 17.1s
CPU Affinity: y-------
# xm vcpu-list guest_dom
Name ID VCPUs CPU State Time(s) CPU Affinity
guest_dom 13 0 0 -b- 17.1 0
I guess that the allocated memory to cpumap must be 8-byte for Xen
because "xc_vcpu_setaffinity at libxc/xc_domain.c" is using uint64_t
as cpumap. But the libvirt is allocating only maplen size for cpumap.
virsh +--- cpumaplen ---+
(more than 1-byte)
xen +----------------- 8-byte -----------------+
(uint64_t)
Then, an irregular value is set to the buffer that is more than the
number of physical CPU, because libvirt initialize maplen size only
(i.e. not initialize 8-byte buffer).
So, I changed the size of cpumap and the value of nr_cpus
at xen_internal.c.
Regards,
Saori Fukuta
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