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Date: Thu, 3 Aug 2023 17:42:24 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Marc Zyngier <maz@...nel.org>,
Oliver Upton <oliver.upton@...ux.dev>
Cc: linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
linux-kernel@...r.kernel.org,
Sean Christopherson <seanjc@...gle.com>,
Michal Luczaj <mhal@...x.co>
Subject: [PATCH 2/4] KVM: selftests: Add helper macros for ioctl()s that
return file descriptors
Add KVM, VM, and vCPU scoped helpers for ioctl()s that return file
descriptors, i.e. deduplicate code for asserting success on ioctls() for
which a positive return value, not just zero, is considered success.
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
.../selftests/kvm/include/kvm_util_base.h | 39 +++++++++++++------
tools/testing/selftests/kvm/lib/kvm_util.c | 17 ++++----
2 files changed, 36 insertions(+), 20 deletions(-)
diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
index 90b7739ca204..b35b0bd23683 100644
--- a/tools/testing/selftests/kvm/include/kvm_util_base.h
+++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
@@ -253,6 +253,14 @@ static inline bool kvm_has_cap(long cap)
TEST_ASSERT(!ret, __KVM_IOCTL_ERROR(#cmd, ret)); \
})
+#define kvm_fd_ioctl(kvm_fd, cmd, arg) \
+({ \
+ int fd = __kvm_ioctl(kvm_fd, cmd, arg); \
+ \
+ TEST_ASSERT(fd >= 0, __KVM_IOCTL_ERROR(#cmd, fd)); \
+ fd; \
+})
+
static __always_inline void static_assert_is_vm(struct kvm_vm *vm) { }
#define __vm_ioctl(vm, cmd, arg) \
@@ -268,6 +276,14 @@ static __always_inline void static_assert_is_vm(struct kvm_vm *vm) { }
TEST_ASSERT(!ret, __KVM_IOCTL_ERROR(#cmd, ret)); \
})
+#define vm_fd_ioctl(vm, cmd, arg) \
+({ \
+ int fd = __vm_ioctl(vm, cmd, arg); \
+ \
+ TEST_ASSERT(fd >= 0, __KVM_IOCTL_ERROR(#cmd, fd)); \
+ fd; \
+})
+
static __always_inline void static_assert_is_vcpu(struct kvm_vcpu *vcpu) { }
#define __vcpu_ioctl(vcpu, cmd, arg) \
@@ -283,16 +299,21 @@ static __always_inline void static_assert_is_vcpu(struct kvm_vcpu *vcpu) { }
TEST_ASSERT(!ret, __KVM_IOCTL_ERROR(#cmd, ret)); \
})
+#define vcpu_fd_ioctl(vcpu, cmd, arg) \
+({ \
+ int fd = __vcpu_ioctl(vcpu, cmd, arg); \
+ \
+ TEST_ASSERT(fd >= 0, __KVM_IOCTL_ERROR(#cmd, fd)); \
+ fd; \
+})
+
/*
* Looks up and returns the value corresponding to the capability
* (KVM_CAP_*) given by cap.
*/
static inline int vm_check_cap(struct kvm_vm *vm, long cap)
{
- int ret = __vm_ioctl(vm, KVM_CHECK_EXTENSION, (void *)cap);
-
- TEST_ASSERT(ret >= 0, KVM_IOCTL_ERROR(KVM_CHECK_EXTENSION, ret));
- return ret;
+ return vm_fd_ioctl(vm, KVM_CHECK_EXTENSION, (void *)cap);
}
static inline int __vm_enable_cap(struct kvm_vm *vm, uint32_t cap, uint64_t arg0)
@@ -348,10 +369,7 @@ static inline uint32_t kvm_vm_reset_dirty_ring(struct kvm_vm *vm)
static inline int vm_get_stats_fd(struct kvm_vm *vm)
{
- int fd = __vm_ioctl(vm, KVM_GET_STATS_FD, NULL);
-
- TEST_ASSERT(fd >= 0, KVM_IOCTL_ERROR(KVM_GET_STATS_FD, fd));
- return fd;
+ return vm_fd_ioctl(vm, KVM_GET_STATS_FD, NULL);
}
static inline void read_stats_header(int stats_fd, struct kvm_stats_header *header)
@@ -558,10 +576,7 @@ static inline void vcpu_nested_state_set(struct kvm_vcpu *vcpu,
#endif
static inline int vcpu_get_stats_fd(struct kvm_vcpu *vcpu)
{
- int fd = __vcpu_ioctl(vcpu, KVM_GET_STATS_FD, NULL);
-
- TEST_ASSERT(fd >= 0, KVM_IOCTL_ERROR(KVM_GET_STATS_FD, fd));
- return fd;
+ return vcpu_fd_ioctl(vcpu, KVM_GET_STATS_FD, NULL);
}
int __kvm_has_device_attr(int dev_fd, uint32_t group, uint64_t attr);
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index 7a8af1821f5d..557de1d26f10 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -117,8 +117,12 @@ unsigned int kvm_check_cap(long cap)
int kvm_fd;
kvm_fd = open_kvm_dev_path_or_exit();
- ret = __kvm_ioctl(kvm_fd, KVM_CHECK_EXTENSION, (void *)cap);
- TEST_ASSERT(ret >= 0, KVM_IOCTL_ERROR(KVM_CHECK_EXTENSION, ret));
+
+ /*
+ * KVM_CHECK_EXTENSION doesn't return a file descriptor, but the
+ * semantics are the same: a negative value is considered a failure.
+ */
+ ret = kvm_fd_ioctl(kvm_fd, KVM_CHECK_EXTENSION, (void *)cap);
close(kvm_fd);
@@ -136,12 +140,10 @@ void vm_enable_dirty_ring(struct kvm_vm *vm, uint32_t ring_size)
static void vm_open(struct kvm_vm *vm)
{
- vm->kvm_fd = _open_kvm_dev_path_or_exit(O_RDWR);
-
TEST_REQUIRE(kvm_has_cap(KVM_CAP_IMMEDIATE_EXIT));
- vm->fd = __kvm_ioctl(vm->kvm_fd, KVM_CREATE_VM, (void *)vm->type);
- TEST_ASSERT(vm->fd >= 0, KVM_IOCTL_ERROR(KVM_CREATE_VM, vm->fd));
+ vm->kvm_fd = _open_kvm_dev_path_or_exit(O_RDWR);
+ vm->fd = kvm_fd_ioctl(vm->kvm_fd, KVM_CREATE_VM, (void *)vm->type);
}
const char *vm_guest_mode_string(uint32_t i)
@@ -1226,8 +1228,7 @@ struct kvm_vcpu *__vm_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id)
vcpu->vm = vm;
vcpu->id = vcpu_id;
- vcpu->fd = __vm_ioctl(vm, KVM_CREATE_VCPU, (void *)(unsigned long)vcpu_id);
- TEST_ASSERT(vcpu->fd >= 0, KVM_IOCTL_ERROR(KVM_CREATE_VCPU, vcpu->fd));
+ vcpu->fd = vm_fd_ioctl(vm, KVM_CREATE_VCPU, (void *)(unsigned long)vcpu_id);
TEST_ASSERT(vcpu_mmap_sz() >= sizeof(*vcpu->run), "vcpu mmap size "
"smaller than expected, vcpu_mmap_sz: %i expected_min: %zi",
--
2.41.0.585.gd2178a4bd4-goog
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