Re: [RFC PATCH v1 00/18] Provide a new two step DMA API mapping API

[Zhu Yanjun]

在 2024/7/3 13:42, Christoph Hellwig 写道:
> I just tried to boot this on my usual qemu test setup with emulated
> nvme devices, and it dead-loops with messages like this fairly late
> in the boot cycle:
>
> [   43.826627] iommu: unaligned: iova 0xfff7e000 pa 0x000000010be33650 size 0x1000 min_pagesz 0x1000
> [   43.826982] dma_mapping_error -12
>
> passing intel_iommu=off instead of intel_iommu=on (expectedly) makes

I also confronted this problem.IMO, if intel_iommu=off, the driver of 
drivers/iommu can not be used.

If I remember correctly, some guys in the first version can fix this 
problem. I will check the mails.

To me, I just revert this commit because I do not use this commit about 
nvme.

Zhu Yanjun

> it go away.