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Re: [Xen-devel] Re: [PATCH] VT-d: prevent dom0 to use VT-d HW
| To: | Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, Christian Tramnitz <chris.ace@xxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Re: [PATCH] VT-d: prevent dom0 to use VT-d HW |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Tue, 08 Sep 2009 15:14:56 +0100 |
| Cc: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Tue, 08 Sep 2009 07:15:25 -0700 |
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| Thread-topic: | [Xen-devel] Re: [PATCH] VT-d: prevent dom0 to use VT-d HW |
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On 08/09/2009 15:07, "Ian Jackson" <Ian.Jackson@xxxxxxxxxxxxx> wrote:
> Christian Tramnitz writes ("[Xen-devel] Re: [PATCH] VT-d: prevent dom0 to use
> VT-d HW"):
>> 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?
>
> I don't think that would be right. Nowadays we want to be able to
> build kernels that will work on bare hardware, or under Xen, rather
> than baking the configuration statically into the kernel image.
The correct alternative would be to gate VT-d initialisation at run-time,
conditional on being run as dom0. Probably would need a hook and probably
would not be hugely palatable to the kernel maintainers. This effective
'virtualisation'/hack of the ACPI tables is probably the right way to go.
-- Keir
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