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RE: [Xen-devel] [bug] 'VT-d 1G super page' feature is blocked

>>> On 03.08.11 at 19:58, "Kay, Allen M" <allen.m.kay@xxxxxxxxx> wrote:
> Off hand, I don't see any reason iommu_setup() cannot be moved after 
> do_presmp_initcalls() in __start_xen().
> Theoretically, iommu_setup() just needs to be called before any device 
> operation.  We should give it a try.

So who's going to try this out then, and submit a patch?


> Allen
> -----Original Message-----
> From: Tim Deegan [mailto:tim@xxxxxxx] 
> Sent: Wednesday, August 03, 2011 10:13 AM
> To: Ren, Yongjie
> Cc: Xen Devel; Kay, Allen M; Li, Xin
> Subject: Re: [Xen-devel] [bug] 'VT-d 1G super page' feature is blocked
> At 10:08 +0800 on 03 Aug (1312366080), Ren, Yongjie wrote:
>> Hi Tim,
>> Any comment on this issue ?
>> It seems that cs# 23247 introduced this issue.
> Hi, 
> Allen points out that the EPT capability variable that is checked
> doesn't get initialized until VMX is set up, which right now happens
> _after_ the IOMMU is configured.
> Allen, is there any reason that the call to iommu_enable() shouldn't be
> moved to after do_presmp_initcalls()?  If so, then I guess we should
> open-code the hardware capability check in the vtD init code. 
> Tim.

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