[kvm-unit-tests PATCH v5 12/13] arm/arm64: ITS: migration tests

[Eric Auger <eric.auger@redhat.com>]

This test maps LPIs (populates the device table, the collection table,
interrupt translation tables, configuration table), migrates and make
sure the translation is correct on the destination.

Signed-off-by: Eric Auger <eric.auger@redhat.com>

---
v4 -> v5:
- move stub from header to arm/gic.c

v3 -> v4:
- assert in its_get_device/collection if the id is not found
---
 arm/gic.c                  | 59 ++++++++++++++++++++++++++++++++++----
 arm/unittests.cfg          |  8 ++++++
 lib/arm64/asm/gic-v3-its.h |  3 ++
 lib/arm64/gic-v3-its.c     | 22 ++++++++++++++
 4 files changed, 86 insertions(+), 6 deletions(-)

diff --git a/arm/gic.c b/arm/gic.c
index 32b709e..b8fbc13 100644
--- a/arm/gic.c
+++ b/arm/gic.c
@@ -590,6 +590,7 @@ static void gic_test_mmio(void)
 
 static void test_its_introspection(void) {}
 static void test_its_trigger(void) {}
+static void test_its_migration(void) {}
 
 #else /* __aarch64__ */
 
@@ -658,13 +659,19 @@ static int its_prerequisites(int nb_cpus)
 	return 0;
 }
 
-static void test_its_trigger(void)
+/*
+ * Setup the configuration for those mappings:
+ * dev_id=2 event=20 -> vcpu 3, intid=8195
+ * dev_id=7 event=255 -> vcpu 2, intid=8196
+ * LPIs ready to hit
+ */
+static int its_setup1(void)
 {
 	struct its_collection *col3, *col2;
 	struct its_device *dev2, *dev7;
 
 	if (its_prerequisites(4))
-		return;
+		return -1;
 
 	dev2 = its_create_device(2 /* dev id */, 8 /* nb_ites */);
 	dev7 = its_create_device(7 /* dev id */, 8 /* nb_ites */);
@@ -678,14 +685,10 @@ static void test_its_trigger(void)
 	its_send_invall(col2);
 	its_send_invall(col3);
 
-	report_prefix_push("int");
 	/*
 	 * dev=2, eventid=20  -> lpi= 8195, col=3
 	 * dev=7, eventid=255 -> lpi= 8196, col=2
-	 * Trigger dev2, eventid=20 and dev7, eventid=255
-	 * Check both LPIs hit
 	 */
-
 	its_send_mapd(dev2, true);
 	its_send_mapd(dev7, true);
 
@@ -694,6 +697,23 @@ static void test_its_trigger(void)
 
 	its_send_mapti(dev2, 8195 /* lpi id */, 20 /* event id */, col3);
 	its_send_mapti(dev7, 8196 /* lpi id */, 255 /* event id */, col2);
+	return 0;
+}
+
+static void test_its_trigger(void)
+{
+	struct its_collection *col3, *col2;
+	struct its_device *dev2, *dev7;
+
+	if (its_setup1())
+		return;
+
+	col3 = its_get_collection(3);
+	col2 = its_get_collection(2);
+	dev2 = its_get_device(2);
+	dev7 = its_get_device(7);
+
+	report_prefix_push("int");
 
 	lpi_stats_expect(3, 8195);
 	its_send_int(dev2, 20);
@@ -756,6 +776,29 @@ static void test_its_trigger(void)
 	check_lpi_stats("no LPI after collection unmap");
 	report_prefix_pop();
 }
+
+static void test_its_migration(void)
+{
+	struct its_device *dev2, *dev7;
+
+	if (its_setup1())
+		return;
+
+	dev2 = its_get_device(2);
+	dev7 = its_get_device(7);
+
+	puts("Now migrate the VM, then press a key to continue...\n");
+	(void)getchar();
+	report_info("Migration complete");
+
+	lpi_stats_expect(3, 8195);
+	its_send_int(dev2, 20);
+	check_lpi_stats("dev2/eventid=20 triggers LPI 8195 en PE #3 after migration");
+
+	lpi_stats_expect(2, 8196);
+	its_send_int(dev7, 255);
+	check_lpi_stats("dev7/eventid=255 triggers LPI 8196 on PE #2 after migration");
+}
 #endif
 
 int main(int argc, char **argv)
@@ -793,6 +836,10 @@ int main(int argc, char **argv)
 		report_prefix_push(argv[1]);
 		test_its_trigger();
 		report_prefix_pop();
+	} else if (!strcmp(argv[1], "its-migration")) {
+		report_prefix_push(argv[1]);
+		test_its_migration();
+		report_prefix_pop();
 	} else if (strcmp(argv[1], "its-introspection") == 0) {
 		report_prefix_push(argv[1]);
 		test_its_introspection();
diff --git a/arm/unittests.cfg b/arm/unittests.cfg
index b9a7a2c..480adec 100644
--- a/arm/unittests.cfg
+++ b/arm/unittests.cfg
@@ -136,6 +136,14 @@ extra_params = -machine gic-version=3 -append 'its-trigger'
 groups = its
 arch = arm64
 
+[its-migration]
+file = gic.flat
+smp = $MAX_SMP
+accel = kvm
+extra_params = -machine gic-version=3 -append 'its-migration'
+groups = its migration
+arch = arm64
+
 # Test PSCI emulation
 [psci]
 file = psci.flat
diff --git a/lib/arm64/asm/gic-v3-its.h b/lib/arm64/asm/gic-v3-its.h
index 889d6ce..e9f89c1 100644
--- a/lib/arm64/asm/gic-v3-its.h
+++ b/lib/arm64/asm/gic-v3-its.h
@@ -166,4 +166,7 @@ extern void __its_send_sync(struct its_collection *col, bool verbose);
 #define its_send_movi_nv(dev, col, id)			__its_send_movi(dev, col, id, false)
 #define its_send_sync_nv(col)				__its_send_sync(col, false)
 
+extern struct its_device *its_get_device(u32 id);
+extern struct its_collection *its_get_collection(u32 id);
+
 #endif /* _ASMARM64_GIC_V3_ITS_H_ */
diff --git a/lib/arm64/gic-v3-its.c b/lib/arm64/gic-v3-its.c
index 442dcf0..9c9fa60 100644
--- a/lib/arm64/gic-v3-its.c
+++ b/lib/arm64/gic-v3-its.c
@@ -148,3 +148,25 @@ struct its_collection *its_create_collection(u32 col_id, u32 pe)
 	its_data.nr_collections++;
 	return new;
 }
+
+struct its_device *its_get_device(u32 id)
+{
+	int i;
+
+	for (i = 0; i < GITS_MAX_DEVICES; i++) {
+		if (its_data.devices[i].device_id == id)
+			return &its_data.devices[i];
+	}
+	assert(0);
+}
+
+struct its_collection *its_get_collection(u32 id)
+{
+	int i;
+
+	for (i = 0; i < GITS_MAX_COLLECTIONS; i++) {
+		if (its_data.collections[i].col_id == id)
+			return &its_data.collections[i];
+	}
+	assert(0);
+}
-- 
2.20.1