• Satya Tangirala's avatar
    block: Keyslot Manager for Inline Encryption · 1b262839
    Satya Tangirala authored
    Inline Encryption hardware allows software to specify an encryption context
    (an encryption key, crypto algorithm, data unit num, data unit size) along
    with a data transfer request to a storage device, and the inline encryption
    hardware will use that context to en/decrypt the data. The inline
    encryption hardware is part of the storage device, and it conceptually sits
    on the data path between system memory and the storage device.
    
    Inline Encryption hardware implementations often function around the
    concept of "keyslots". These implementations often have a limited number
    of "keyslots", each of which can hold a key (we say that a key can be
    "programmed" into a keyslot). Requests made to the storage device may have
    a keyslot and a data unit number associated with them, and the inline
    encryption hardware will en/decrypt the data in the requests using the key
    programmed into that associated keyslot and the data unit number specified
    with the request.
    
    As keyslots are limited, and programming keys may be expensive in many
    implementations, and multiple requests may use exactly the same encryption
    contexts, we introduce a Keyslot Manager to efficiently manage keyslots.
    
    We also introduce a blk_crypto_key, which will represent the key that's
    programmed into keyslots managed by keyslot managers. The keyslot manager
    also functions as the interface that upper layers will use to program keys
    into inline encryption hardware. For more information on the Keyslot
    Manager, refer to documentation found in block/keyslot-manager.c and
    linux/keyslot-manager.h.
    Co-developed-by: default avatarEric Biggers <ebiggers@google.com>
    Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
    Signed-off-by: default avatarSatya Tangirala <satyat@google.com>
    Reviewed-by: default avatarEric Biggers <ebiggers@google.com>
    Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
    Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
    1b262839
Kconfig 6.55 KB