Hi Yongkang,
>Hi all,
>
>I find a strange issue that if I only assign 1 or 2 vcpus to dom0, I can
>not use vcpu-pin to pin the No. 0 vcpu. It will report: "Invalid argument".
> But it works, if I let Xen0 see all vcpus when booting.
>
>For example, in IA32, set (dom0-cpus 1)
>After Xen0 boot up, "xm vcpu-p 0 0 0" will see errors.
>If setting (dom0-cpus 0), above command works.
>
>In IA64, set dom0_max_vcpus=2 (totally have 16 vcpus)
>After Xen0 boot up, "xm vcpu-p 0 0 0" will see errors.
>But "xm vcpu-p 0 1 0" works.
>
I think that you can solve this problem by applying the following
patch, and inputting "xm vcpu-pin 0 0 0" from two consoles at the
same time... Need many retry :-)
diff -r 5b9ff5e8653a xen/common/domctl.c
--- a/xen/common/domctl.c Sun Aug 27 06:56:01 2006 +0100
+++ b/xen/common/domctl.c Mon Aug 28 18:01:28 2006 +0900
@@ -380,13 +380,6 @@ long do_domctl(XEN_GUEST_HANDLE(xen_domc
if ( op->cmd == XEN_DOMCTL_setvcpuaffinity )
{
- if ( v == current )
- {
- ret = -EINVAL;
- put_domain(d);
- break;
- }
-
xenctl_cpumap_to_cpumask(
&new_affinity, &op->u.vcpuaffinity.cpumap);
ret = vcpu_set_affinity(v, &new_affinity);
But, if Domain-0 has one virtual CPU, this problem cannot be solved
even if applying this patch. If you are using CREDIT scheduler,
'xm vcpu-pin 0 0 0' makes an error by the following line.
static int
csched_vcpu_set_affinity(struct vcpu *vc, cpumask_t *affinity)
{
unsigned long flags;
int lcpu;
if ( vc == current )
{
/* No locking needed but also can't move on the spot... */
if ( !cpu_isset(vc->processor, *affinity) )
return -EBUSY; <---- This!
vc->cpu_affinity = *affinity;
}
Hi Keir,
Do you have good ideas to solve this problem?
Best regards,
Kan
>Best Regards,
>Yongkang (Kangkang)
>
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