linux-kernel - [RFC PATCH 022/105] KVM: selftests: Multiplex return code and fd in __kvm_create

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Message-Id: <20220311055056.57265-23-seanjc@google.com>
Date:   Fri, 11 Mar 2022 05:49:33 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     linux-kernel@...r.kernel.org
Cc:     Sean Christopherson <seanjc@...gle.com>
Subject: [RFC PATCH 022/105] KVM: selftests: Multiplex return code and fd in __kvm_create_device()

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 tools/testing/selftests/kvm/aarch64/vgic_init.c  |  6 +++---
 .../selftests/kvm/include/kvm_util_base.h        |  2 +-
 tools/testing/selftests/kvm/lib/kvm_util.c       | 16 +++++++---------
 3 files changed, 11 insertions(+), 13 deletions(-)

diff --git a/tools/testing/selftests/kvm/aarch64/vgic_init.c b/tools/testing/selftests/kvm/aarch64/vgic_init.c
index 18d1d0335108..1015f6fc352c 100644
--- a/tools/testing/selftests/kvm/aarch64/vgic_init.c
+++ b/tools/testing/selftests/kvm/aarch64/vgic_init.c
@@ -642,8 +642,8 @@ static void test_v3_its_region(void)
 int test_kvm_device(uint32_t gic_dev_type)
 {
 	struct vm_gic v;
-	int ret, fd;
 	uint32_t other;
+	int ret;
 
 	v.vm = vm_create_default_with_vcpus(NR_VCPUS, 0, 0, guest_code, NULL);
 
@@ -657,8 +657,8 @@ int test_kvm_device(uint32_t gic_dev_type)
 		return ret;
 	v.gic_fd = kvm_create_device(v.vm, gic_dev_type);
 
-	ret = __kvm_create_device(v.vm, gic_dev_type, &fd);
-	TEST_ASSERT(ret && errno == EEXIST, "create GIC device twice");
+	ret = __kvm_create_device(v.vm, gic_dev_type);
+	TEST_ASSERT(ret < 0 && errno == EEXIST, "create GIC device twice");
 
 	/* try to create the other gic_dev_type */
 	other = VGIC_DEV_IS_V2(gic_dev_type) ? KVM_DEV_TYPE_ARM_VGIC_V3
diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
index 081ba04e5df3..df1202bacc04 100644
--- a/tools/testing/selftests/kvm/include/kvm_util_base.h
+++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
@@ -480,7 +480,7 @@ void vcpu_args_set(struct kvm_vm *vm, uint32_t vcpuid, unsigned int num, ...);
 int _kvm_device_check_attr(int dev_fd, uint32_t group, uint64_t attr);
 int kvm_device_check_attr(int dev_fd, uint32_t group, uint64_t attr);
 int __kvm_test_create_device(struct kvm_vm *vm, uint64_t type);
-int __kvm_create_device(struct kvm_vm *vm, uint64_t type, int *fd);
+int __kvm_create_device(struct kvm_vm *vm, uint64_t type);
 int kvm_create_device(struct kvm_vm *vm, uint64_t type);
 int _kvm_device_access(int dev_fd, uint32_t group, uint64_t attr,
 		       void *val, bool write);
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index f0a08de67f0f..e10894cc2bc1 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -1610,27 +1610,25 @@ int __kvm_test_create_device(struct kvm_vm *vm, uint64_t type)
 	return __vm_ioctl(vm, KVM_CREATE_DEVICE, &create_dev);
 }
 
-int __kvm_create_device(struct kvm_vm *vm, uint64_t type, int *fd)
+int __kvm_create_device(struct kvm_vm *vm, uint64_t type)
 {
 	struct kvm_create_device create_dev = {
 		.type = type,
 		.fd = -1,
 		.flags = 0,
 	};
-	int ret;
+	int err;
 
-	ret = __vm_ioctl(vm, KVM_CREATE_DEVICE, &create_dev);
-	*fd = create_dev.fd;
-	return ret;
+	err = __vm_ioctl(vm, KVM_CREATE_DEVICE, &create_dev);
+	TEST_ASSERT(err <= 0, "KVM_CREATE_DEVICE shouldn't return a positive value");
+	return err ? : create_dev.fd;
 }
 
 int kvm_create_device(struct kvm_vm *vm, uint64_t type)
 {
-	int fd, ret;
+	int fd = __kvm_create_device(vm, type);
 
-	ret = __kvm_create_device(vm, type, &fd);
-
-	TEST_ASSERT(!ret, "KVM_CREATE_DEVICE IOCTL failed, rc: %i errno: %i", ret, errno);
+	TEST_ASSERT(fd >= 0, "KVM_CREATE_DEVICE IOCTL failed, rc: %i errno: %i", fd, errno);
 	return fd;
 }
 
-- 
2.35.1.723.g4982287a31-goog