[kvm-unit-tests PATCH] riscv: sbi: Add no target ipi test

[Andrew Jones]

On Mon, Mar 17, 2025 at 01:08:15PM +0100, Andrew Jones wrote:
> While an hmask of zero without an hbase of -1 (which would mean
> broadcast) is pointless, since nothing is targeted, the spec
> doesn't say it should return an error. Maybe it should? Anyway,
> for now, just confirm that it "works".
> 
> Signed-off-by: Andrew Jones <andrew.jones at linux.dev>
> ---
>  riscv/sbi.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/riscv/sbi.c b/riscv/sbi.c
> index 219f7187acf3..16d918d00848 100644
> --- a/riscv/sbi.c
> +++ b/riscv/sbi.c
> @@ -507,6 +507,10 @@ end_two:
>  			max_hartid = cpus[cpu].hartid;
>  	}
>  
> +	/* Test no targets */
> +	ret = sbi_send_ipi(0, 0);
> +	sbiret_report_error(&ret, SBI_SUCCESS, "no targets");
> +
>  	/* Try the next higher hartid than the max */
>  	ret = sbi_send_ipi(2, max_hartid);
>  	report_kfail(true, ret.error == SBI_ERR_INVALID_PARAM, "hart_mask got expected error (%ld)", ret.error);
> -- 
> 2.48.1
>

Applied to riscv/sbi[1] with the test below added too just to make sure
that a nonzero hbase with a zero hmask doesn't break things.

Thanks,
drew

	ret = sbi_send_ipi(0, 1);
	sbiret_report_error(&ret, SBI_SUCCESS, "no targets, hart_mask_base is 1");

[1] https://gitlab.com/jones-drew/kvm-unit-tests/-/commits/riscv/sbi