[PATCH v2 2/4] KVM: arm64: selftests: Add test for GICD.num_LPIs

[Zhou Wang]

Add test case about GICD.num_LPIs. The default value should be 0, and it
can be modified before GIC init, but cannot be modified after GIC init.

Signed-off-by: Zhou Wang <wangzhou1 at hisilicon.com>
---
 tools/testing/selftests/kvm/arm64/vgic_init.c | 33 +++++++++++++++++++
 .../selftests/kvm/include/arm64/gic_v3.h      |  2 ++
 2 files changed, 35 insertions(+)

diff --git a/tools/testing/selftests/kvm/arm64/vgic_init.c b/tools/testing/selftests/kvm/arm64/vgic_init.c
index a8e0f46bc0ab..7e60443827e9 100644
--- a/tools/testing/selftests/kvm/arm64/vgic_init.c
+++ b/tools/testing/selftests/kvm/arm64/vgic_init.c
@@ -968,6 +968,38 @@ static void test_v3_sysregs(void)
 	kvm_vm_free(vm);
 }
 
+static void test_v3_num_lpis(void)
+{
+	struct kvm_vcpu *vcpus[NR_VCPUS];
+	u32 num_lpis;
+	struct vm_gic vm;
+	u32 typer;
+	int ret;
+
+	vm = vm_gic_create_with_vcpus(KVM_DEV_TYPE_ARM_VGIC_V3, NR_VCPUS, vcpus);
+	kvm_create_device(vm.vm, KVM_DEV_TYPE_ARM_VGIC_ITS);
+
+	kvm_device_attr_get(vm.gic_fd, KVM_DEV_ARM_VGIC_GRP_DIST_REGS,
+			    GICD_TYPER, &typer);
+	num_lpis = typer & GICD_TYPER_NUM_LPIS_MASK;
+	TEST_ASSERT(!num_lpis, "Default value of GICD.num_LPIs is not 0");
+
+	typer |= 10 << GICD_TYPER_NUM_LPIS_SHIFT;
+	ret = __kvm_device_attr_set(vm.gic_fd, KVM_DEV_ARM_VGIC_GRP_DIST_REGS,
+				    GICD_TYPER, &typer);
+	TEST_ASSERT(!ret, KVM_IOCTL_ERROR(KVM_DEVICE_ATTR_SET, ret));
+
+	kvm_device_attr_set(vm.gic_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
+			    KVM_DEV_ARM_VGIC_CTRL_INIT, NULL);
+
+	ret = __kvm_device_attr_set(vm.gic_fd, KVM_DEV_ARM_VGIC_GRP_DIST_REGS,
+				    GICD_TYPER, &typer);
+	TEST_ASSERT(ret && errno == EBUSY,
+		    "Changed GICD.num_LPIs after initializing the VGIC");
+
+	vm_gic_destroy(&vm);
+}
+
 void run_tests(uint32_t gic_dev_type)
 {
 	test_vcpus_then_vgic(gic_dev_type);
@@ -985,6 +1017,7 @@ void run_tests(uint32_t gic_dev_type)
 		test_v3_its_region();
 		test_v3_sysregs();
 		test_v3_nassgicap();
+		test_v3_num_lpis();
 	}
 }
 
diff --git a/tools/testing/selftests/kvm/include/arm64/gic_v3.h b/tools/testing/selftests/kvm/include/arm64/gic_v3.h
index a76615fa39a1..c9f25cdd3651 100644
--- a/tools/testing/selftests/kvm/include/arm64/gic_v3.h
+++ b/tools/testing/selftests/kvm/include/arm64/gic_v3.h
@@ -85,6 +85,8 @@
 #define GICD_TYPER_ESPI			(1U << 8)
 
 #define GICD_TYPER_ID_BITS(typer)	((((typer) >> 19) & 0x1f) + 1)
+#define GICD_TYPER_NUM_LPIS_MASK	GENMASK(15, 11)
+#define GICD_TYPER_NUM_LPIS_SHIFT	11
 #define GICD_TYPER_NUM_LPIS(typer)	((((typer) >> 11) & 0x1f) + 1)
 #define GICD_TYPER_SPIS(typer)		((((typer) & 0x1f) + 1) * 32)
 #define GICD_TYPER_ESPIS(typer)						\
-- 
2.33.0