Re: [PATCH] nvme-pci: Set min align mask before calculating max_hw_sectors

[Christoph Hellwig]

On Wed, Sep 21, 2022 at 11:10:58AM +0300, Sagi Grimberg wrote:
>
>> If swiotlb is force enabled dma_max_mapping_size ends up calling
>> swiotlb_max_mapping_size which takes into account the min align
>> mask for the device.
>> Set the min align mask for nvme driver before calling
>> dma_max_mapping_size while calculating max hw sectors.
>
> Does this fix a specific bug? if so it needs a fixes tag so it can
> go to stable backports as well.

Hmm.  Basically this is another fixlet for nvme on swiotlb, which
already drove adding the max_mapping size and the align_mask, and
it seems we still hadn't covered all corner cases properly.  So
I think it basically has been broken since day 1, but nvme on
swiotlb only started becoming "interesting" with the trusted
hypervisor schemes.