[Xen-devel] Re: [Xen-announce] Questions about the control tools in Xen

[Ian Pratt <Ian.Pratt@xxxxxxxxxxxx>]

> Recently, I have traced part of the Xen VMM code.
> 
> but I have some troubles...
> 
> I could not find out the function ioctl() which is called by the function 
> do_privcmd() (xeno-1.2.bk/tools/xc/lib/xc_private.h)

"man ioctl" -- its a system call

> Is the interface between guest OS and VMM just like the interface between OS 
> and Hardware ?

Similar, but different. The best overview description is in the
SOSP paper available off the project web page.

> Is there any protection in Xen VMM to protect that only Domain 0 could use 
> the control tools?

Yes. There's a concept of a 'privileged domain' that all dom0_ops
and other hypervisor interfaces check. In future, we may allow
delegations to enable, for example, domain 3 to be able to
control and manipulate domain 7 but no others.

Best,
Ian


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