NetBSD/Xen kernel fixups?

NetBSD/Xen kernel fixups?

[Derrik Pates]

All,

In the process of experimenting with Xen, and particularly NetBSD on 
Xen, I noticed that the Xen-patched NetBSD kernel, when invoking 'halt' 
or 'reboot' within NetBSD, it didn't exactly work like these do within 
Linux - the NetBSD domain would continue to spin (apparently invoking 
'hlt' over and over?), but the domain would not terminate by itself, 
after running 'halt', and 'reboot' would try to reboot, but wouldn't 
succeed - it would claim it was trying to reboot, and stop.

I went in and added calls to HYPERVISOR_shutdown() and 
HYPERVISOR_reboot() in what appeared to be appropriate places, and now 
'halt' and 'reboot' do work as expected. However, I'd also like to be 
able to use the 'xm shutdown' command from domain 0. Is there any 
interest in a patch to the netbsd-2.0-xen-sparse tree, that includes 
these changes? I'll have to research how one would execute a userspace 
command from within the kernel, as Linux does, to handle that operation.

-- 
Derrik Pates
demon@devrandom.net


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RE: NetBSD/Xen kernel fixups?

[Ian Pratt]

> I went in and added calls to HYPERVISOR_shutdown() and 
> HYPERVISOR_reboot() in what appeared to be appropriate 
> places, and now 
> 'halt' and 'reboot' do work as expected. However, I'd also like to be 
> able to use the 'xm shutdown' command from domain 0. Is there any 
> interest in a patch to the netbsd-2.0-xen-sparse tree, that includes 
> these changes? I'll have to research how one would execute a 
> userspace 
> command from within the kernel, as Linux does, to handle that 
> operation.

Sounds like useful functionality to me!

Ian


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Re: NetBSD/Xen kernel fixups?

[Christian Limpach]

On Thu, 17 Feb 2005 12:19:12 -0500, Derrik Pates <demon@devrandom.net> wrote:
> In the process of experimenting with Xen, and particularly NetBSD on
> Xen, I noticed that the Xen-patched NetBSD kernel, when invoking 'halt'
> or 'reboot' within NetBSD, it didn't exactly work like these do within
> Linux - the NetBSD domain would continue to spin (apparently invoking
> 'hlt' over and over?), but the domain would not terminate by itself,
> after running 'halt', and 'reboot' would try to reboot, but wouldn't
> succeed - it would claim it was trying to reboot, and stop.

I thought this was working because I remember that I fixed it at some
point.  reboot and shutdown should call the corresponding functions
and halt will not shutdown or reboot the machine but leave it in a
tight loop doing nothing.  I guess it would make sense to use
HYPERVISOR_block instead of the loop so that the domain won't take a
lot of cpu, but other than that I don't see what's wrong with the
current behaviour...

> I went in and added calls to HYPERVISOR_shutdown() and
> HYPERVISOR_reboot() in what appeared to be appropriate places, and now
> 'halt' and 'reboot' do work as expected. However, I'd also like to be
> able to use the 'xm shutdown' command from domain 0. Is there any
> interest in a patch to the netbsd-2.0-xen-sparse tree, that includes
> these changes? I'll have to research how one would execute a userspace
> command from within the kernel, as Linux does, to handle that operation.

Sure, if you can figure out how to do this cleanly, that would be a
good thing to have.  Thanks!

     christian


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