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testing: Use host's /dev/urandom as /dev/random on guests via VirtIO RNG

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Newer versions of systemd etc. seem to require quite a lot of entropy
from /dev/random while booting, which can block and therefore delay the
start of other services (in particular sshd) by more than a minute.
Using the host's /dev/urandom via VirtIO RNG, we can avoid blocking the
guests.

The required kernel options are added for kernel versions 5.4+.
This commit is contained in:
Tobias Brunner
2020-09-03 13:34:19 +02:00
parent 766017a8d3
commit 5747ec4eae
10 changed files with 39 additions and 3 deletions
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testing/config/kernel/config-5.4
+6 -1
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@@ -1660,7 +1660,12 @@ CONFIG_DEVKMEM=y
CONFIG_HVC_DRIVER=y
CONFIG_VIRTIO_CONSOLE=y
# CONFIG_IPMI_HANDLER is not set
# CONFIG_HW_RANDOM is not set
CONFIG_HW_RANDOM=y
# CONFIG_HW_RANDOM_TIMERIOMEM is not set
CONFIG_HW_RANDOM_INTEL=y
CONFIG_HW_RANDOM_AMD=y
# CONFIG_HW_RANDOM_VIA is not set
CONFIG_HW_RANDOM_VIRTIO=y
# CONFIG_NVRAM is not set
# CONFIG_APPLICOM is not set
# CONFIG_MWAVE is not set