Xen devel - Dec 2004 - PATCH: ability to send sysrqs to Linux domains

Here''s the promised patch against a recent 2.01 snapshot to allow you
to
send sysrqs to running Linux kernels.  I went with Keir''s suggestion of
adding a sub-reason code to the shutdown message with a 1-byte payload 
specifying which key was pressed.  Hope it''s acceptable for the main 
tree; I will happily alter it to spec if any of the maintainers have 
suggestions for better structuring it.

It adds the CONFIG_MAGIC_SYSRQ option to the Linux kernel which you need 
to turn on for a guest to work with it, then you can just do e.g. "xm 
sysrq domainname s" to sync your discs.

cheers,

-- 
Matthew Bloch                             Bytemark Hosting
                                 http://www.bytemark.co.uk/
                 phone UK: 0845 004 3 004 US: 1-877 BYTEMAR
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Matthew Bloch wrote:
> Here''s the promised patch against a recent 2.01 snapshot to allow
you to
> send sysrqs to running Linux kernels.  I went with Keir''s
suggestion of
> adding a sub-reason code to the shutdown message with a 1-byte payload 
> specifying which key was pressed.  Hope it''s acceptable for the
main
> tree; I will happily alter it to spec if any of the maintainers have 
> suggestions for better structuring it.
There''s a slight problem with the client/server python code.
On the client side you have

def xend_domain_shutdown(self, id, reason, key=None):
         return self.xendPost(self.domainurl(id),
                              {''op''      :
''shutdown'',
                               ''reason''  : reason,
                               ''key''     : key })

while on the server side you have

  fn = FormFn(self.xd.domain_shutdown,
              [[''dom'', ''str''],
               [''reason'', ''str''],
               [''key'', ''int'']])

which means ''key'' has to be an int.
So passing ''None'' is going to cause an error.

Mike


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