On Friday 27 November 2015, 07:58:47 wrote Adrian Schröter:
> On Thursday 26 November 2015, 22:57:57 wrote Dirk Müller:
> > Hi Adrian,
> > 
> > > 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
> > idea.
> > 
> > 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 build.
> 
> 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)

-- 

Adrian Schroeter
email: adr...@suse.de

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 
(AG Nürnberg) 
 
Maxfeldstraße 5                         
90409 Nürnberg 
Germany 


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