Re: [PATCH kernel 9/9] pci: Allow encrypted MMIO mapping via sysfs

Alexey Kardashevskiy
2026-03-02T08:59:36Z

On 2/3/26 19:20, Aneesh Kumar K.V wrote:
> Alexey Kardashevskiy <aik@amd.com> writes:
>
>> Add another resource#d_enc to allow mapping MMIO as
>> an encrypted/private region.
>>
>> Unlike resourceN_wc, the node is added always as ability to
>> map MMIO as private depends on negotiation with the TSM which
>> happens quite late.
>
> Why is this needed? Is this for a specific tool?

It is not _needed_ but (as the cover letter says) since one of my test devices does not use private MMIO for the main function, here it is to allow https://github.com/billfarrow/pcimem.git to map MMIO as private and do simple reads/writes. Useful for validation, can stop in gdb and inspect tables and whatever. Thanks,

>
> -aneesh

--
Alexey