RE: [Xen-devel] Windows SMP

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> On 29/12/2008 08:20, "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
wrote:
> 
> >>  3. Run Citrix drivers which patch Windows to avoid TPR writes.
> 
> > Can you elaborate on that last point? Does that pass WHQL?
> 
> The WHQL tests are oblivious to it. It's just a patching of mmio
writes to
> the APIC TPR register.
> 

Looking at the way KVM does it, it appears to detect writes to the TPR
register when they are trapped, and then give the DomU (or whatever KVM
calls it) the address of the instruction so that the DomU driver can
then patch it. Is that what Citrix is doing? Does the current xensource
tree have such a mechanism in it?

Thanks

James

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