Acquire uuid of user domain X from Dom0

Acquire uuid of user domain X from Dom0

[Liran Schour]

I need to get from kernel space in dom0 the UUID of user domain X. How can
I do that?

Thanks,
- Liran

Re: Acquire uuid of user domain X from Dom0

[Keir Fraser]

On 7/9/06 11:48, "Liran Schour" <LIRANS@il.ibm.com> wrote:

> I need to get from kernel space in dom0 the UUID of user domain X. How can
> I do that?

Read it from xenstore, or build one of your source files with
-D__XEN_TOOLS__ and use the getdomaininfo domctl hypercall. I think option
(1) is better.

 -- Keir

Re: Acquire uuid of user domain X from Dom0

[Liran Schour]

Keir Fraser <Keir.Fraser@cl.cam.ac.uk> wrote on 07/09/2006 16:57:44:

>
>
>
> On 7/9/06 11:48, "Liran Schour" <LIRANS@il.ibm.com> wrote:
>
> > I need to get from kernel space in dom0 the UUID of user domain X. How
can
> > I do that?
>
> Read it from xenstore, or build one of your source files with
> -D__XEN_TOOLS__ and use the getdomaininfo domctl hypercall. I think
option
> (1) is better.
>
How can I read it from xenstore as I can see from examples in the code
xenstore API inside the kernel, like xenbus_read, assumes that we are
already inside the path /local/domain/X ( X = 0 ) and I need information
about domain Y. Any ideas?

- Liran

Re: Acquire uuid of user domain X from Dom0

[Keir Fraser]

On 11/9/06 6:01 pm, "Jacob Gorm Hansen" <jacobg@diku.dk> wrote:

>> How can I read it from xenstore as I can see from examples in the code
>> xenstore API inside the kernel, like xenbus_read, assumes that we are
>> already inside the path /local/domain/X ( X = 0 ) and I need information
>> about domain Y. Any ideas?
> 
> I am be wrong here, but I don't think you are supposed to use the UUID
> inside the kernel, as this is a Xend-only construct.

It is available, with the caveat that its semantics across things like
save/restore is not really well-defined (what happens if a VM forks, for
example).

 -- Keir

Re: Acquire uuid of user domain X from Dom0

[Jacob Gorm Hansen]

On 9/11/06, Liran Schour <LIRANS@il.ibm.com> wrote:

> How can I read it from xenstore as I can see from examples in the code
> xenstore API inside the kernel, like xenbus_read, assumes that we are
> already inside the path /local/domain/X ( X = 0 ) and I need information
> about domain Y. Any ideas?

hi,
I am be wrong here, but I don't think you are supposed to use the UUID
inside the kernel, as this is a Xend-only construct.

Jacob

Re: Acquire uuid of user domain X from Dom0

[Liran Schour]

jacobgorm@gmail.com wrote on 11/09/2006 20:01:26:

> On 9/11/06, Liran Schour <LIRANS@il.ibm.com> wrote:
>
> > How can I read it from xenstore as I can see from examples in the code
> > xenstore API inside the kernel, like xenbus_read, assumes that we are
> > already inside the path /local/domain/X ( X = 0 ) and I need
information
> > about domain Y. Any ideas?
>
> hi,
> I am be wrong here, but I don't think you are supposed to use the UUID
> inside the kernel, as this is a Xend-only construct.

I am working on a security project in which I need some unique identifier
for each domain. UUID sounds like a reasonable choice. The only problem is
how do I technically get it from dom0?

- Liran