Re: [kvm-unit-tests PATCH v2 4/4] arm64: split its-migrate-unmapped-collection into KVM and TCG variants

[Andrew Jones]

On Tue, May 25, 2021 at 06:26:28PM +0100, Alex Bennée wrote:
> When running the test in TCG we are basically running on bare metal so
> don't rely on having a particular kernel errata applied.
> 
> You might wonder why we handle this with a totally new test name
> instead of adjusting the append to take an extra parameter? Well the
> run_migration shell script uses eval "$@" which unwraps the -append
> leading to any second parameter being split and leaving QEMU very
> confused and the test hanging. This seemed simpler than re-writing all
> the test running logic in something sane ;-)

Yes, bash is a pain for this. I may try to get migration with more than
one parameter to work at some point though. But, for generally determining
if a unit test is running with tcg or with kvm, we have the QEMU_ACCEL
environment variable. So you could just do getenv("QEMU_ACCEL") in the
unit test. However, I wouldn't use it for this case, since the purpose is
just to force errata to be ignored. We have the "ERRATA_FORCE" environment
variable for that already. You can set it yourself, e.g.

 $ ERRATA_FORCE=y tests/its-migration

or, if you plan to run all tests, then with

 $ ./run_tests.sh -a

but that also runs nodefault tests. Maybe we should teach run_tests.sh
to always set ERRATA_FORCE=y when running with TCG?

Thanks,
drew