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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