[Xen-devel] Re: [PATCH] VT-d: prevent dom0 to use VT-d HW

[Christian Tramnitz <chris.ace@xxxxxxx>]

Han, Weidong wrote:
> pv-ops dom0 contains Linux upstream VT-d driver, and will go to enable it when 
> VT-d is set in kernel config file. It should not enable VT-d in dom0.
>
> Currently it already zaps ACPI DMAR signature to prevents dom0 using VT-d HW when VT-d is enabled for Xen. But when VT-d is not enabled for Xen, and VT-d is set in pv-ops kernel config file, pv-ops dom0 will go to enable it. This will results in pv-ops dom0 booting failure. This patch prevents dom0 to use VT-d HW whether VT-d is enabled or disabled for Xen. 
Wouldn't be easier (and more likely to be adopted by upstream) to add a 
Kconfig dependency like "depends on !XEN_DOM0" to VT-d?

Best regards,
  Christian


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