Xen devel - Jan 2004 - Domain asking for its own destruction

hi,

is it possible for a domain != 0 to ask for its own destruction?

Jacob



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Indeed it is - XenoLinux does this when it shuts down.

The domain in question does a SCHED_OP_exit scheduler operation using a 
hypercall and Xen destroys the domain.

For an example of this being done in XenoLinux see HYPERVISOR_exit() in 
source/include/asm-xeno/hypervisor.h - this function is called by 
machine_restart(), machine_halt() and machine_poweroff() in 
source/arch/xeno/kernel/process.c, when the virtual machine is shut down.

On the Xen side of things, the hypercall is demuxed (in 
source/xen/arch/i386/entry.S), resulting in a call to do_sched_op() (in 
source/xen/common/schedule.c), which in turn calls kill_domain(), which 
results in various functions being called which do the business of killing 
the current domain.

HTH.

Mark

On Jan 7 2004, Jacob Gorm Hansen wrote:
> hi,
> 
> is it possible for a domain != 0 to ask for its own destruction?
> 
> Jacob
> 
> 
> 
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> hi,
> 
> is it possible for a domain != 0 to ask for its own destruction?
> 
> Jacob
Not yet. We''ll soon have shared comms rings between each guest and
domain-0, which can then be used to "proxy" such requests to the
existing DOM0 control interface. 

 -- Keir


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> > hi,
> > 
> > is it possible for a domain != 0 to ask for its own destruction?
> > 
> > Jacob
> 
> Not yet. We''ll soon have shared comms rings between each guest and
> domain-0, which can then be used to "proxy" such requests to the
> existing DOM0 control interface. 
Whoops. Actually a domain can request destruction -- that''s what the
HYPERVISOR_exit() hypercall is for! It''s the preferred way to
terminate a domain because it allows the guest OS to clean up first.

 -- Keir


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