Re: [PATCH v2] iommu/vt-d: avoid unnecessory panic if iommu init fail in tboot system

[Lukasz Hawrylko]

Hi Zhenzhong

On Tue, 2020-11-10 at 15:19 +0800, Zhenzhong Duan wrote:
> "intel_iommu=off" command line is used to disable iommu but iommu is force
> enabled in a tboot system for security reason.
> 
> However for better performance on high speed network device, a new option
> "intel_iommu=tboot_noforce" is introduced to disable the force on.
> 
> By default kernel should panic if iommu init fail in tboot for security
> reason, but it's unnecessory if we use "intel_iommu=tboot_noforce,off".
> 
> Fix the code setting force_on and move intel_iommu_tboot_noforce
> from tboot code to intel iommu code.
> 
> Fixes: 7304e8f28bb2 ("iommu/vt-d: Correctly disable Intel IOMMU force on")
> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@xxxxxxxxx>
> ---
> v2: move ckeck of intel_iommu_tboot_noforce into iommu code per Baolu.

I have check it on my TXT testing environment with latest TBOOT,
everything works as expected.

Thanks,
Lukasz