[PATCH 2/2] tests/qtest: Add seed CSR zero extension test

Add a qtest that reads the seed CSR on RV64 machine with Zkr support
and verifies that the upper 32 bits are clear.

Signed-off-by: Ivan Efremov <[email protected]>
---
 tests/qtest/riscv-csr-test.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/tests/qtest/riscv-csr-test.c b/tests/qtest/riscv-csr-test.c
index bb1b0ffed3..7479a5c5bc 100644
--- a/tests/qtest/riscv-csr-test.c
+++ b/tests/qtest/riscv-csr-test.c
@@ -20,6 +20,12 @@
 #define CSR_MVENDORID       0xf11
 #define CSR_MISELECT        0x350
 
+#define CSR_SEED           0x015
+
+#define SEED_OPST_MASK     (UINT64_C(0x3) << 30)
+#define SEED_OPST_ES16     (UINT64_C(0x2) << 30)
+#define SEED_OPST_DEAD     (UINT64_C(0x3) << 30)
+
 static void run_test_csr(void)
 {
     uint64_t res;
@@ -46,12 +52,32 @@ static void run_test_csr(void)
     qtest_quit(qts);
 }
 
+static void run_test_seed_csr(void)
+{
+    uint64_t val = 0;
+    uint64_t opst;
+    QTestState *qts;
+
+    qts = qtest_init("-machine virt -cpu tt-ascalon");
+
+    qtest_csr_call(qts, "get_csr", 0, CSR_SEED, &val);
+
+    opst = val & SEED_OPST_MASK;
+    g_assert_true(opst == SEED_OPST_ES16 ||
+                  opst == SEED_OPST_DEAD);
+
+    g_assert_cmphex(val >> 32, ==, 0);
+
+    qtest_quit(qts);
+}
+
 int main(int argc, char **argv)
 {
     g_test_init(&argc, &argv, NULL);
 
     if (qtest_has_machine("virt")) {
         qtest_add_func("/cpu/csr", run_test_csr);
+        qtest_add_func("/cpu/csr/seed", run_test_seed_csr);
     }
 
     return g_test_run();
-- 
2.43.0