On Friday 27 November 2015, 08:02:19 wrote Adrian Schröter:
On Friday 27 November 2015, 07:58:47 wrote Adrian
On Thursday 26 November 2015, 22:57:57 wrote Dirk
I have disabled for now kernel RNG support in the
build script for arm,
but we need to discuss if we want to have this in future (by having
proper kernel and initrd support for it) or if we should disable it in
general for arm.
Not all ARMv7 workers have support hardware available for a random
number generator. Most do, so disabling it globally is not a good
I'm not sure what the problem was, but now I had no chance to debug -
isn't this already solved by the autodetection that Andreas submitted?
The problem is that we can't detect from outside if the kernel which is loading
will complain about the extra parameter or not. And complain means here stopping
The commits from the mentioned pull request are merged and active,
but they only affect the qemu-kvm behaviour, not the kernel behaviour.
All what we we can do is checking on the host if the hardware is able
to provide hardware rng and then just guessing if the guest kernel
will support it IMHO.
Some something like
dd if=/dev/hwrng of=/dev/null bs=1 count=1 || kvm_rng_device=
this which is disabling rng options when no device is there in the
host. Do you know a better way to check for hwrng which avoids
such a potential hanging read? I do not have any arm 32bit with hwrng
device around, it seems.
okay, the second commit tries to do this already ... checking why it breaks ...
(sorry, first mail before coffee)
[ 14s] linux64 /usr/bin/qemu-system-arm -nodefaults -no-reboot -nographic -vga none
-enable-kvm -M virt -cpu host -object rng-random,filename=/dev/random,id=rng0 -device
virtio-rng-pci,rng=rng0 -mem-prealloc -mem-path /dev/hugepages -net none -kernel
/boot/zImage.guest -initrd /boot/initrd -append root=/dev/disk/by-id/virtio-0
rootfstype=ext4 rootflags=noatime panic=1 quiet no-kvmclock nmi_watchdog=0 rw
rd.driver.pre=binfmt_misc elevator=noop console=ttyAMA0 init=/.build/build -m 1020 -drive
-device virtio-blk-device,drive=disk -drive
-device virtio-blk-device,drive=swap -serial stdio -smp 1
[ 14s] qemu-system-arm: -device virtio-rng-pci,rng=rng0: No 'PCI' bus found
for device 'virtio-rng-pci'
So, virtio rng device seems not to work with non-hardware rng generator.
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