[kvm-unit-tests PATCH 31/33] arm: realm: Add a test for shared memory

Suzuki K Poulose
2024-04-12T10:39:06Z

Do some basic tests that trigger marking a memory region as
RIPAS_EMPTY and accessing the shared memory. Also, convert it back
to RAM and make sure the contents are scrubbed.

Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
arm/Makefile.arm64 | 1 +
arm/realm-ns-memory.c | 86 +++++++++++++++++++++++++++++++++++++++++++
arm/unittests.cfg | 8 ++++
3 files changed, 95 insertions(+)
create mode 100644 arm/realm-ns-memory.c

diff --git a/arm/Makefile.arm64 b/arm/Makefile.arm64
index 7a56029e..bd8c947d 100644
--- a/arm/Makefile.arm64
+++ b/arm/Makefile.arm64
@@ -68,6 +68,7 @@ tests += $(TEST_DIR)/fpu.$(exe)
tests += $(TEST_DIR)/realm-rsi.$(exe)
tests += $(TEST_DIR)/realm-sea.$(exe)
tests += $(TEST_DIR)/realm-attest.$(exe)
+tests += $(TEST_DIR)/realm-ns-memory.$(exe)

include $(SRCDIR)/$(TEST_DIR)/Makefile.common

diff --git a/arm/realm-ns-memory.c b/arm/realm-ns-memory.c
new file mode 100644
index 00000000..8360c371
--- /dev/null
+++ b/arm/realm-ns-memory.c
@@ -0,0 +1,86 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2022 Arm Limited.
+ * All rights reserved.
+ */
+
+#include <asm/io.h>
+#include <alloc_page.h>
+#include <bitops.h>
+
+#define GRANULE_SIZE 0x1000
+#define BUF_SIZE (PAGE_SIZE * 2)
+#define BUF_PAGES (BUF_SIZE / PAGE_SIZE)
+#define BUF_GRANULES (BUF_SIZE / GRANULE_SIZE)
+
+static char __attribute__((aligned(PAGE_SIZE))) buffer[BUF_SIZE];
+
+static void static_shared_buffer_test(void)
+{
+ int i;
+
+ set_memory_decrypted((unsigned long)buffer, sizeof(buffer));
+ for (i = 0; i < sizeof(buffer); i += GRANULE_SIZE)
+ buffer[i] = (char)i;
+
+ /*
+ * Verify the content of the NS buffer
+ */
+ for (i = 0; i < sizeof(buffer); i += GRANULE_SIZE) {
+ if (buffer[i] != (char)i) {
+ report(false, "Failed to set Non Secure memory");
+ return;
+ }
+ }
+
+ /* Make the buffer back to protected... */
+ set_memory_encrypted((unsigned long)buffer, sizeof(buffer));
+ /* .. and check if the contents were destroyed */
+ for (i = 0; i < sizeof(buffer); i += GRANULE_SIZE) {
+ if (buffer[i] != 0) {
+ report(false, "Failed to scrub protected memory");
+ return;
+ }
+ }
+
+ report(true, "Conversion of protected memory to shared and back");
+}
+
+static void dynamic_shared_buffer_test(void)
+{
+ char *ns_buffer;
+ int i;
+ int order = get_order(BUF_PAGES);
+
+ ns_buffer = alloc_pages_shared(order);
+ assert(ns_buffer);
+ for (i = 0; i < sizeof(buffer); i += GRANULE_SIZE)
+ ns_buffer[i] = (char)i;
+
+ /*
+ * Verify the content of the NS buffer
+ */
+ for (i = 0; i < sizeof(buffer); i += GRANULE_SIZE) {
+ if (ns_buffer[i] != (char)i) {
+ report(false, "Failed to set Non Secure memory");
+ return;
+ }
+ }
+ free_pages_shared(ns_buffer);
+ report(true, "Dynamic allocation and free of shared memory\n");
+}
+
+static void ns_test(void)
+{
+ static_shared_buffer_test();
+ dynamic_shared_buffer_test();
+}
+
+int main(int argc, char **argv)
+{
+ report_prefix_pushf("ns-memory");
+ ns_test();
+ report_prefix_pop();
+
+ return report_summary();
+}
diff --git a/arm/unittests.cfg b/arm/unittests.cfg
index f95fc1ba..55a17f2b 100644
--- a/arm/unittests.cfg
+++ b/arm/unittests.cfg
@@ -367,3 +367,11 @@ smp = 1
extra_params = -m 32 -append 'measurement'
accel = kvm
arch = arm64
+
+[realm-ns-memory]
+file=realm-ns-memory.flat
+groups = nodefault realms
+smp = 1
+extra_params = -m 32
+accel = kvm
+arch = arm64