RE: [Xen-devel] details of iommu_inclusive_mapping problem?

["Han, Weidong" <weidong.han@xxxxxxxxx>]

Andrew Lyon wrote:
> Hi,
> 
> On my Supermicro X7DWA-N board I have to boot Xen with
> iommu_inclusive_mapping=y to use iommu, I have had some stability
> problems when using passthru and I wonder if that is because I am
> using this workaround so I contacted Supermicro about it and they
> asked me for details of exactly which registers are wrong, I am not
> able to provide this information, can anybody explain how I might work
> out exactly what is wrong so that I can tell them?
> 
>  From what I have read the problem is that the rmrr memory ranges are
> not within reserved memory, I know how to work out the rmrr start and
> length from acpidump but I don't know how to work out the reserved
> ranges, which table are they in?
>

You can see the reserved ranges in e820 table. I think you can send the RMRR 
ranges and e820 table to them. Actually it's a BIOS issue. Pls try the latest 
BIOS first if you are not using it.

Regards,
Weidong



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