Hi Stephan, We ran tests with your patches on our bare metal platform (AMD Epyc CPU) and saw an improvement in boot time entropy after analyzing the collected jitter deltas. Patches looks good to me. Thanks for your work! Acked-by: Abylay Ospan <aospan@xxxxxxxxxx> -----Original Message----- From: Stephan Müller <smueller@xxxxxxxxxx> Sent: Thursday, September 21, 2023 7:48 AM To: herbert@xxxxxxxxxxxxxxxxxxx Cc: linux-crypto@xxxxxxxxxxxxxxx; Ospan, Abylay <aospan@xxxxxxxxxx> Subject: [EXTERNAL] [PATCH 0/3] crypto: jitter - Offer compile-time options CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you can confirm the sender and know the content is safe. Hi, the following patchset offers a set of compile-time options to accommodate different hardware with different entropy rates implied in their timers. This allows configuring the Jitter RNG in systems which exhibits insufficient entropy with the default parameters. The default parameters defined by the patches, however, are identical to the existing code and thus do not alter the Jitter RNG behavior. The first patch sets the state by allowing the configuration of different oversampling rates. The second patch allows the configuration of different memory sizes and the third allows the configuration of differnet oversampling rates. The update of the power up test with the first patch also addresses reports that the Jitter RNG did not initialize due to it detected insufficient entropy. Stephan Mueller (3): crypto: jitter - add RCT/APT support for different OSRs crypto: jitter - Allow configuration of memory size crypto: jitter - Allow configuration of oversampling rate crypto/Kconfig | 60 +++++++++ crypto/jitterentropy-kcapi.c | 17 ++- crypto/jitterentropy.c | 249 ++++++++++++++++++----------------- crypto/jitterentropy.h | 5 +- 4 files changed, 207 insertions(+), 124 deletions(-) -- 2.42.0
