[kvm-unit-tests PATCH 19/33] arm64: selftest: add realm SVE VL test

[Suzuki K Poulose <suzuki.poulose@arm.com>]

From: Joey Gouly <joey.gouly@arm.com>

Check that the requested SVE vector length matches what
the Realm was configured with.

Signed-off-by: Joey Gouly <joey.gouly@arm.com>
[ Fix build failures on arm ]
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 arm/selftest.c              |  6 ++++++
 arm/unittests.cfg           |  2 +-
 lib/arm/asm/sve-vl-test.h   |  9 +++++++++
 lib/arm64/asm/sve-vl-test.h | 28 ++++++++++++++++++++++++++++
 4 files changed, 44 insertions(+), 1 deletion(-)
 create mode 100644 lib/arm/asm/sve-vl-test.h
 create mode 100644 lib/arm64/asm/sve-vl-test.h

diff --git a/arm/selftest.c b/arm/selftest.c
index 8caadad3..7bc5fb76 100644
--- a/arm/selftest.c
+++ b/arm/selftest.c
@@ -21,6 +21,8 @@
 #include <asm/barrier.h>
 #include <asm/rsi.h>
 
+#include <asm/sve-vl-test.h>
+
 static cpumask_t ready, valid;
 
 static void __user_psci_system_off(void)
@@ -60,6 +62,10 @@ static void check_setup(int argc, char **argv)
 			       "number of CPUs matches expectation");
 			report_info("found %d CPUs", nr_cpus);
 			++nr_tests;
+
+		} else if (strcmp(argv[i], "sve-vl") == 0) {
+			if (check_arm_sve_vl(val))
+				nr_tests++;
 		}
 
 		report_prefix_pop();
diff --git a/arm/unittests.cfg b/arm/unittests.cfg
index e35e8506..3cf6b719 100644
--- a/arm/unittests.cfg
+++ b/arm/unittests.cfg
@@ -33,7 +33,7 @@
 [selftest-setup]
 file = selftest.flat
 smp = 2
-extra_params = -m 256 -append 'setup smp=2 mem=256'
+extra_params = -m 256 -append 'setup smp=2 mem=256 sve-vl'
 groups = selftest
 
 # Test vector setup and exception handling (kernel mode).
diff --git a/lib/arm/asm/sve-vl-test.h b/lib/arm/asm/sve-vl-test.h
new file mode 100644
index 00000000..19eaf669
--- /dev/null
+++ b/lib/arm/asm/sve-vl-test.h
@@ -0,0 +1,9 @@
+#ifndef __ARM_SVE_VL_TEST_H
+#define __ARM_SVE_VL_TEST_H
+
+static bool check_arm_sve_vl(long val)
+{
+	return false;
+}
+
+#endif
diff --git a/lib/arm64/asm/sve-vl-test.h b/lib/arm64/asm/sve-vl-test.h
new file mode 100644
index 00000000..c82ea154
--- /dev/null
+++ b/lib/arm64/asm/sve-vl-test.h
@@ -0,0 +1,28 @@
+#ifndef __ARM_SVE_VL_TEST_H_
+#define __ARM_SVE_VL_TEST_H_
+
+#include <asm/processor.h>
+#include <asm/sysreg.h>
+
+static bool check_arm_sve_vl(long val)
+{
+	unsigned long vl;
+
+	if (!system_supports_sve()) {
+		report_skip("SVE is not supported\n");
+	} else {
+		/* Enable the maxium SVE vector length */
+		write_sysreg(ZCR_EL1_LEN, ZCR_EL1);
+		vl = sve_vl();
+		/* Realms are configured with a SVE VL */
+		if (is_realm()) {
+			report(vl == val,
+				"SVE VL expected (%ld), detected (%ld)",
+				val, vl);
+		} else {
+			report(true, "Detected SVE VL %ld\n", vl);
+		}
+	}
+	return true;
+}
+#endif
-- 
2.34.1