From: Thomas Petazzoni via buildroot <buildroot@buildroot.org>
To: "Alexis Lothoré" <alexis.lothore@bootlin.com>
Cc: buildroot@buildroot.org,
Ricardo Martincoski <ricardo.martincoski@datacom.com.br>
Subject: Re: [Buildroot] [PATCH] support/testing: use host entropy for ARMv7 emulation
Date: Mon, 19 Oct 2026 18:59:29 +0200 [thread overview]
Message-ID: <atZMbZkyz2RaIUJ6@windsurf> (raw)
In-Reply-To: <20261019-fix_crng_init_slow-v1-1-48ad2d5008d6@bootlin.com>
On Mon, Oct 19, 2026 at 05:39:54PM +0200, Alexis Lothoré via buildroot wrote:
> When running tests depending on entropy pool being ready on armv7 (eg:
> test_openscap.py, which runs the 'oscap' binary, which tries to get
> random bytes, even with simple commands), the test may fail on timeout
> due to the entropy pool not being ready; this is confirmed by the test
> being blocked until "crng init done" line appears in the kernel logs.
>
> A solution could be to just increase the test timeout to a value large
> enough to make sure that the entropy pool will be ready in most cases,
> but it may be hard to find a value that fits all use cases, and all
> tests depending on entropy being ready would deserve the same fix.
>
> Another solution is to replicate what commit 7acb32dabb80
> ("support/testing: add builtin armv5 kernel 4.19 with entropy") did: it
> added the virtio-rng-pci argument to allow the guest machine to use host
> entropy. The armv7 kernel used for testing seems to be built with the
> relevant virtio configuration to allow a similar pass-through, so pass
> virtio-rng-device to armv7 kernel when running tests.
>
> Signed-off-by: Alexis Lothoré <alexis.lothore@bootlin.com>
Applied to master, thanks!
Best regards,
Thomas Petazzoni
--
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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prev parent reply other threads:[~2026-10-19 16:59 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-19 15:39 [Buildroot] [PATCH] support/testing: use host entropy for ARMv7 emulation Alexis Lothoré via buildroot
2026-10-19 16:59 ` Thomas Petazzoni via buildroot [this message]
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