KVM: arm64: selftests: Add init ITS device test

Add some ITS device init tests: general KVM device tests (address not
defined already, address aligned) and tests for the ITS region being
within the addressable IPA range.
Signed-off-by: Ricardo Koller <ricarkol@google.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211005011921.437353-12-ricarkol@google.com

tools/testing/selftests/kvm/aarch64/vgic_init.c

@@ -598,6 +598,47 @@ static void test_v3_redist_ipa_range_check_at_vcpu_run(void)
 	vm_gic_destroy(&v);
 }
 
+static void test_v3_its_region(void)
+{
+	struct vm_gic v;
+	uint64_t addr;
+	int its_fd, ret;
+
+	v = vm_gic_create_with_vcpus(KVM_DEV_TYPE_ARM_VGIC_V3, NR_VCPUS);
+	its_fd = kvm_create_device(v.vm, KVM_DEV_TYPE_ARM_VGIC_ITS, false);
+
+	addr = 0x401000;
+	ret = _kvm_device_access(its_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
+			  KVM_VGIC_ITS_ADDR_TYPE, &addr, true);
+	TEST_ASSERT(ret && errno == EINVAL,
+		"ITS region with misaligned address");
+
+	addr = max_phys_size;
+	ret = _kvm_device_access(its_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
+			  KVM_VGIC_ITS_ADDR_TYPE, &addr, true);
+	TEST_ASSERT(ret && errno == E2BIG,
+		"register ITS region with base address beyond IPA range");
+
+	addr = max_phys_size - 0x10000;
+	ret = _kvm_device_access(its_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
+			  KVM_VGIC_ITS_ADDR_TYPE, &addr, true);
+	TEST_ASSERT(ret && errno == E2BIG,
+		"Half of ITS region is beyond IPA range");
+
+	/* This one succeeds setting the ITS base */
+	addr = 0x400000;
+	kvm_device_access(its_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
+			  KVM_VGIC_ITS_ADDR_TYPE, &addr, true);
+
+	addr = 0x300000;
+	ret = _kvm_device_access(its_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
+			  KVM_VGIC_ITS_ADDR_TYPE, &addr, true);
+	TEST_ASSERT(ret && errno == EEXIST, "ITS base set again");
+
+	close(its_fd);
+	vm_gic_destroy(&v);
+}
+
 /*
  * Returns 0 if it's possible to create GIC device of a given type (V2 or V3).
  */
@@ -650,6 +691,7 @@ void run_tests(uint32_t gic_dev_type)
 		test_v3_last_bit_redist_regions();
 		test_v3_last_bit_single_rdist();
 		test_v3_redist_ipa_range_check_at_vcpu_run();
+		test_v3_its_region();
 	}
 }