Re: [PATCH 0/4] Adds wrapped key support for inline storage encryption

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On Wed, Dec 08, 2021 at 12:09:03AM +0000, Gaurav Kashyap wrote:
> Hey Eric, here are the answers to some of the questions across all the patches
> 
> > Also, at runtime, does any of the Qualcomm hardware support multiple key
> > types, and if so can they be used at the same time?
> 
> Currently, with hardware key manager data path, there is no support for
> standard keys. So, when HWKM is being used, only wrapped keys are supported.
> If standard keys need to be supported, it can be, but modifications are
> required within trustzone.

Do the SoCs support both key types though, just not at the same time?  E.g. when
the ufs_qcom driver loads on SM8350, could it choose to expose either standard
key support or wrapped key support, or is it predetermined by the hardware
and/or firmware?  If the driver has a choice, then there should be a kernel
module parameter (module_param()) that controls it, so that the user can choose
which key type they want when they boot their kernel.

- Eric



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