RE: [Xen-devel] [PATCH][VTD] enable integrated graphics passthrough for Calpella and Sandybridge

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Tue, 8 Jun 2010, Kay, Allen M wrote:
> Stephano,
> 
> Thanks for your feedback.  I add "#ifdef CONFIG_PASSTHROUGH" in the next 
> version of the patch.
> 
> I have tested the patch on a Intel Montevina software development platform 
> and found it has the same behavior as current xen qemu upstream.
> 
> Can others who have been playing with IGD passthrough give the patch a try on 
> older platforms?
> 

Are there any older platforms without opregion support?
If that is the case what is the result of executing this code on such a
platform?

+    /* 1:1 map ASL Storage register value */
+    igd_opregion = pt_pci_host_read(0, 2, 0, 0xfc, 4);
+    PT_LOG("register_vga: igd_opregion = %x\n", igd_opregion);
+    ret |= xc_domain_memory_mapping(xc_handle, domid,
+            igd_opregion >> XC_PAGE_SHIFT,
+            igd_opregion >> XC_PAGE_SHIFT,
+            2,
+            DPCI_ADD_MAPPING);


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