[SeaBIOS] [Xen-devel] Ideas for PV on SeaBIOS

Ian Campbell Ian.Campbell at eu.citrix.com
Mon May 23 12:23:18 CEST 2011

On Mon, 2011-05-23 at 11:20 +0100, James Harper wrote:
> > 
> > On Sat, 2011-05-21 at 09:44 +0100, James Harper wrote:
> > > Am I understanding right that the OS would need to be completely put on
> > > hold in the middle of the hypercall while the BIOS took over and did
> > > it's shutdown sequence, which presumably involves xenstore activity?
> > 
> > Correct, or at least that is one suggestion (probably the front runner
> > at the moment).
> > 
> > In theory it's no worse than SMM, which Windows presumably already copes
> > with, but perhaps the latency from having to do the xenstore interaction
> > is far greater than any real SMM operation.
> > 
> How hard would it be to create a better mechanism for going forward
> and implement the above as a fallback if the DomU doesn't support the
> new mechanism?

I suspect the answer is, not all that hard...

In fact I think that would make sense regardless of how hard it is.


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