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RE: [Xen-devel] wallclock time for paravirtualized guests

  • To: "Bruce Rogers" <brogers@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
  • Date: Tue, 28 Mar 2006 04:40:16 +0100
  • Delivery-date: Tue, 28 Mar 2006 03:41:59 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcZSEbSk1s+34z2gTiujSvOWj+e3mQAB1J0w
  • Thread-topic: [Xen-devel] wallclock time for paravirtualized guests

> The paravirtualized guests are offered wallclock time 
> referenced to UTC only, while fully virtualized guests are 
> given the option via the config file (localtime parameter) of 
> starting with UTC time or local time.
> What would it take to optionally provide localtime to the 
> paravirtualized guests as well?
> For a guest that launches assuming localtime as its time 
> basis, then later deriving UTC from it based on configuration 
> files, this is problematic, requiring some convolutions to 
> how it handles time as it boots.
> Is there some place where we can insert a localtime offset 
> into the start-of-day structure, or perhaps change the 
> sharedinfo wallclock time to be either localtime or utc, 
> depending on a localtime parameter in the config file, 
> similar to what is done for fully virtualized guests?

I guess it might be useful to be able to configure a 'wallclock offset
in seconds' for a domain. It would need to be implemented in Xen and set
via a dom0 op.


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