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SubjectRe: [PATCH v2] sparc64: Add support for Application Data Integrity (ADI)
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On 03/07/2016 01:33 PM, Khalid Aziz wrote:
>
> That is a possibility but limited in scope. An address range covered
> by a single TTE can have large number of tags. Version tags are set on
> cacheline. In extreme case, one could set a tag for each set of
> 64-bytes in a page. Also tags are set completely in userspace and no
> transition occurs to kernel space, so kernel has no idea of what tags
> have been set.

...
> I have not found a way to query the MMU on tags.
>

To query the tag for a cache line, you just read it back with ldxa and
ASI_MCD_PRIMARY (ie, asi 0x90), basically the same way you stored the
tag in the first place.

Rob



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