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Re: [PATCH v4 12/12] .travis.yml: Add a KVM-only Aarch64 job

From: Thomas Huth
Subject: Re: [PATCH v4 12/12] .travis.yml: Add a KVM-only Aarch64 job
Date: Sat, 3 Oct 2020 12:14:23 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0

On 03/10/2020 12.03, Richard Henderson wrote:
On 9/29/20 5:43 PM, Philippe Mathieu-Daudé wrote:
Add a job to build QEMU on Aarch64 with TCG disabled, so
this configuration won't bitrot over time.

We explicitly modify default-configs/aarch64-softmmu.mak to
only select the 'virt' and 'SBSA-REF' machines.

I really wish we didn't have to do this.

Can't we e.g. *not* list all of the arm boards explicitly in default-configs,
but use the Kconfig "default y if ..."?

Seems like that would let --disable-tcg work as expected.
One should still be able to create custom configs with e.g.
CONFIG_EXYNOS4=n or CONIFIG_ARM_V4=n, correct?

But that would be different from how we handle all other targets currently...
IMHO we shoud go into a different direction instead, e.g. by adding a "--kconfig-dir" switch to the configure script. If it has not been specified, the configs will be read from default-configs/ (or maybe we should then rename it to configs/default/). But if the switch has been specified with a directory as parameter, the config files will be read from that directory instead. We could then have folders like:

- configs/default (current default-configs)
- configs/no-tcg (all machines that work without tcg)
- configs/lean-kvm (for "nemu"-style minimalistic settings)


What do you think?


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