Commit fbb6cda44190 introduced the flag CRYPTO_ALG_ALLOCATES_MEMORY. This allows to mark algorithms that allocate memory during the datapath so they are not used for disk encryption. Following that, cd74693870fb limited dm-crypt to use only implementations that don't set that flag. After discussions in the crypto mailing list [1][2][3] about how we could re-enable algorithms to be used by dm-crypt, we came to the conclusion that we can change slightly the meaning of the flag !CRYPTO_ALG_ALLOCATES_MEMORY. If an algorithm does not allocate memory for requests with a scatterlist of 4 or less entries (the typical case for dm-crypt), then it can avoid marking the implementation with the flag CRYPTO_ALG_ALLOCATES_MEMORY. This set adjusts the meaning of CRYPTO_ALG_ALLOCATES_MEMORY in the documentation, removes the filtering for algorithms that do not allocate memory in dm-integrity and removes the CRYPTO_ALG_ALLOCATES_MEMORY from the algorithms registered in the QAT driver as this is not allocating memory in the datapath for requests with 4 or less entries in the source and destination scatterlists. [1] https://lore.kernel.org/linux-crypto/20200722072932.GA27544@xxxxxxxxxxxxxxxxxxx/ [2] https://lore.kernel.org/linux-crypto/20230523165503.GA864814@xxxxxxxxxx/ [3] https://lore.kernel.org/linux-crypto/Ysw9E2Az2oK4jfCf@lucas-Virtual-Machine/ Giovanni Cabiddu (3): dm integrity: do not filter algos with CRYPTO_ALG_ALLOCATES_MEMORY crypto: api - adjust meaning of CRYPTO_ALG_ALLOCATES_MEMORY crypto: qat - remove CRYPTO_ALG_ALLOCATES_MEMORY flag drivers/crypto/intel/qat/qat_common/qat_algs.c | 13 ++++++------- .../intel/qat/qat_common/qat_comp_algs.c | 2 +- drivers/md/dm-integrity.c | 2 +- include/linux/crypto.h | 18 ++++++++++++++++-- 4 files changed, 24 insertions(+), 11 deletions(-) -- 2.40.1
