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Re: [Xen-devel][PATCH][RFC] Supporting Enlightened Windows 2008 Server

On Wed, Mar 05, 2008 at 10:28:28PM +0000, Daniel P. Berrange wrote:
> On Wed, Mar 05, 2008 at 03:15:19PM -0700, Ky Srinivasan wrote:
> > I am attaching updated versions of the patches that I posted a couple 
> > of weeks ago. These  have been merged up to the current unstable tip: 
> > changeset 17186:854b0704962b
> > 
> > These patches have been tested on the unstable tip.
> I'm not expert enough to comment on the HV extension implementation itself,
> but in terms of the userspace  side, the user visible configuration file 
> option 'extid=1' is pretty unpleasant.  It is akin to a 'magic constant'
> in C code - no understandable meaning at all.
> I'd like to see it accept a named extension type - if its possible to
> have multiple extensions per guest, then using a list instead of a scalar
> would be better. So how about something closer to
>   extensions = [ "win2k8" ]

Or is there some way you can have some super light weight trap / hook
always loaded, so when Win2k8 makes it first paravirt call, you can
then automatically enable the full extension ? That could let Xen
just 'do the right thing' without needing a config param, and without
having to fully enable the full extension for non-Win2k8 guests.

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