Re: [PATCH 1/1] iommu/arm-smmu-v3: add support for BBML

[Keqian Zhu]

On 2021/1/27 10:01, Leizhen (ThunderTown) wrote:
> 
> 
> On 2021/1/26 18:12, Will Deacon wrote:
>> On Mon, Jan 25, 2021 at 08:23:40PM +0000, Robin Murphy wrote:
>>> Now we probably will need some degreee of BBML feature awareness for the
>>> sake of SVA if and when we start using it for CPU pagetables, but I still
>>> cannot see any need to consider it in io-pgtable.
>>
>> Agreed; I don't think this is something that io-pgtable should have to care
>> about.
Hi,

I have a question here :-).
If the old table is not live, then the break procedure seems unnecessary. Do I miss something?

Thanks,
Keqian

> 
> Yes, the SVA works in stall mode, and the failed device access requests are not
> discarded.
> 
> Let me look for examples. The BBML usage scenario was told by a former colleague.
> 
>>
>> Will
>>
>> .
>>
> 
> 
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