[RFC PATCH 4/4] tests/tcg/aarch64: add system test for FEAT_XS

[Manos Pitsidianakis <manos.pitsidianakis@linaro.org>]

Add system test to make sure FEAT_XS is enabled for max cpu emulation
and that QEMU doesn't crash when encountering an NXS instruction
variant.

Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
---
 tests/tcg/aarch64/system/feat-xs.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/tests/tcg/aarch64/system/feat-xs.c b/tests/tcg/aarch64/system/feat-xs.c
new file mode 100644
index 0000000000000000000000000000000000000000..52a481c577f9420fa2f6d6a794c1f26772cb4bff
--- /dev/null
+++ b/tests/tcg/aarch64/system/feat-xs.c
@@ -0,0 +1,27 @@
+/*
+ * FEAT_XS Test
+ *
+ * Copyright (c) 2024 Linaro Ltd
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include <minilib.h>
+#include <stdint.h>
+
+int main(void)
+{
+    uint64_t isar1;
+
+    asm volatile ("mrs %0, id_aa64isar1_el1" : "=r"(isar1));
+    if (((isar1 >> 56) & (0xff)) != 1) {
+        ml_printf("FEAT_XS not supported by CPU");
+        return 1;
+    }
+    /* VMALLE1NXS */
+    asm volatile (".inst 0xd508971f");
+    /* VMALLE1OSNXS */
+    asm volatile (".inst 0xd508911f");
+
+    return 0;
+}

-- 
2.45.2