Problem about DOMID_SELF

Problem about DOMID_SELF

[夏业添]

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Hi everyone,

I'm new on this field. The comment of source code says that "DOMID_SELF is
used in certain contexts to refer to oneself." Is this id the micro returns
the same as the id which i can get by xm list?

This is the result of my xm list:
[xyt@localhost xen_onoff]$ sudo xm list
Name                                        ID   Mem VCPUs      State
Time(s)
Domain-0                                   0    1974     2     r-----
30180.0
reciever                                             512
1               0.0
sender                                       2      512     1     -b----
76.1

But if I use  printk(KERN_EMERG"this dom:%d\n",DOMID_SELF) on Dom0, the
result is 32752 instead of 0.

Could someone tell me why this happens? Thanks!

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Re: Problem about DOMID_SELF

[Ian Campbell]

On Sun, 2012-04-15 at 09:58 +0100, 夏业添 wrote:
> Hi everyone,
> 
> I'm new on this field. The comment of source code says that
> "DOMID_SELF is used in certain contexts to refer to oneself." Is this
> id the micro returns the same as the id which i can get by xm list?

DOMID_SELF is a magic number used as a placeholder to mean "this
domain", it is interpreted this way by various routines in the
hypervsor, it is not literally the domid of the current domain.

I suggest you grep the Xen source for the definition and use of
DOMID_SELF, all should become clear.

In general domains are not (and do not need to be) aware of their own
domain id.

Ian.



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