As of 1772.0.0, our kernel config enables support for hardware random number generators and builds a couple of drivers as modules (CONFIG_HW_RANDOM_VIRTIO and CONFIG_HW_RANDOM_TIMERIOMEM in commonconfig). In order to speed up entropy gathering at early boot (and hopefully sidestep #2429 and similar issues), it would be convenient to build in the most common drivers.

From a quick look around, this would be my proposed list:

CONFIG_HW_RANDOM_VIRTIO=y
CONFIG_HW_RANDOM_CAVIUM=y
CONFIG_HW_RANDOM_VIA=y
CONFIG_HW_RANDOM_INTEL=y
CONFIG_HW_RANDOM_AMD=y

Two additional sidenotes:

• timeriomem-rng is not available on any of the platforms we support, thus it can be safely disabled
• in order to properly use virtio-rng the host needs to pass -device virtio-rng-pci