RE: [konrad.wilk@xxxxxxxxxx: [Xen-devel] [PATCH 1 of 1] Intel VT-D: Don't turn x2APIC if there is a missing DRHD entry for the IOAPIC]

["Zhang, Xiantao" <xiantao.zhang@xxxxxxxxx>]

Jan Beulich wrote:
>>>> Konrad Rzeszutek Wilk  03/09/10 6:34 PM >>>
>> 
>> What are you guys feeling about this patch?
> 
> My main question is whether just disabling x2apic in this case is
> sufficient (i.e. whether instead we shouldn't disable iommu, or at
> least interrupt remapping, altogether).  

iommu_enable is called after this point, and it also has sanity-check to 
determine whether enable or disable iommu and its related features. This early 
check is only used to determine whether to enable x2apic because it must  be 
enabled at very early time if supported.
Xiantao

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