Re: [kvm-unit-tests PATCH v2 06/18] scripts: Merge the qemu parameter -smp into $qemu_opts

[Andrew Jones <andrew.jones@linux.dev>]

On Mon, Jan 20, 2025 at 04:43:04PM +0000, Alexandru Elisei wrote:
> kvmtool has a different command line parameter to specify the number of
> VCPUs (-c/--cpus). To make it easier to accommodate it, merge the qemu
> specific parameter -smp into $qemu_opts when passing it to the
> $RUNTIME_arch_run script.
> 
> This is safe to do because the $RUNTIME_arch_run script, on all
> architectures, passes the parameters right back to run_qemu() et co, and
> do not treat individual parameters separately.
> 
> Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
> ---
>  scripts/runtime.bash | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/scripts/runtime.bash b/scripts/runtime.bash
> index e5d661684ceb..a89f2d10ab78 100644
> --- a/scripts/runtime.bash
> +++ b/scripts/runtime.bash
> @@ -34,7 +34,8 @@ premature_failure()
>  get_cmdline()
>  {
>      local kernel=$1
> -    echo "TESTNAME=$testname TIMEOUT=$timeout MACHINE=$machine ACCEL=$accel $RUNTIME_arch_run $kernel -smp $smp $qemu_opts"
> +
> +    echo "TESTNAME=$testname TIMEOUT=$timeout MACHINE=$machine ACCEL=$accel $RUNTIME_arch_run $kernel $qemu_opts"
>  }
>  
>  skip_nodefault()
> @@ -87,6 +88,8 @@ function run()
>      local accel="$9"
>      local timeout="${10:-$TIMEOUT}" # unittests.cfg overrides the default
>  
> +    qemu_opts="-smp $smp $qemu_opts"
> +
>      if [ "${CONFIG_EFI}" == "y" ]; then
>          kernel=${kernel/%.flat/.efi}
>      fi
> -- 
> 2.47.1
>

This seems fine, but I still think we want qemu_opts to be opts and we can
parameterize the option names. So we could have a table of option names
that we use in places like this

declare -A vmm_opts

vmm_opts[qemu,nr_cpus]='-smp'
vmm_opts[qemu,another_option]='foo'

vmm_opts[kvmtool,nr_cpus]='-c'
vmm_opts[kvmtool,another_option]='bar'

# $vmm gets set to whatever vmm we're using, e.g. vmm=qemu

opts="${vmm_opts[$vmm,nr_cpus]} $smp $opts"

Thanks,
drew