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

From: Andrew Jones <andrew.jones@linux.dev>
To: kvm-riscv@lists.infradead.org
Cc: Anup Patel <apatel@ventanamicro.com>,
	Atish Patra <atishp@rivosinc.com>,
	cleger@rivosinc.com
Subject: [kvm-unit-tests PATCH] riscv: sbi: Add no target ipi test
Date: Mon, 17 Mar 2025 13:08:15 +0100	[thread overview]
Message-ID: <20250317120814.35241-2-andrew.jones@linux.dev> (raw)

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@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


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