1 files changed, 81 insertions, 0 deletions
diff --git a/tools/testing/selftests/kvm/include/kvm_syscalls.h b/tools/testing/selftests/kvm/include/kvm_syscalls.h
new file mode 100644
index 000000000000..d4e613162bba
--- /dev/null
+++ b/tools/testing/selftests/kvm/include/kvm_syscalls.h
@@ -0,0 +1,81 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef SELFTEST_KVM_SYSCALLS_H
+#define SELFTEST_KVM_SYSCALLS_H
+
+#include <sys/syscall.h>
+
+#define MAP_ARGS0(m,...)
+#define MAP_ARGS1(m,t,a,...) m(t,a)
+#define MAP_ARGS2(m,t,a,...) m(t,a), MAP_ARGS1(m,__VA_ARGS__)
+#define MAP_ARGS3(m,t,a,...) m(t,a), MAP_ARGS2(m,__VA_ARGS__)
+#define MAP_ARGS4(m,t,a,...) m(t,a), MAP_ARGS3(m,__VA_ARGS__)
+#define MAP_ARGS5(m,t,a,...) m(t,a), MAP_ARGS4(m,__VA_ARGS__)
+#define MAP_ARGS6(m,t,a,...) m(t,a), MAP_ARGS5(m,__VA_ARGS__)
+#define MAP_ARGS(n,...) MAP_ARGS##n(__VA_ARGS__)
+
+#define __DECLARE_ARGS(t, a)	t a
+#define __UNPACK_ARGS(t, a)	a
+
+#define DECLARE_ARGS(nr_args, args...) MAP_ARGS(nr_args, __DECLARE_ARGS, args)
+#define UNPACK_ARGS(nr_args, args...) MAP_ARGS(nr_args, __UNPACK_ARGS, args)
+
+#define __KVM_SYSCALL_ERROR(_name, _ret) \
+	"%s failed, rc: %i errno: %i (%s)", (_name), (_ret), errno, strerror(errno)
+
+/* Define a kvm_<syscall>() API to assert success. */
+#define __KVM_SYSCALL_DEFINE(name, nr_args, args...)			\
+static inline void kvm_##name(DECLARE_ARGS(nr_args, args))		\
+{									\
+	int r;								\
+									\
+	r = name(UNPACK_ARGS(nr_args, args));				\
+	TEST_ASSERT(!r, __KVM_SYSCALL_ERROR(#name, r));			\
+}
+
+/*
+ * Macro to define syscall APIs, either because KVM selftests doesn't link to
+ * the standard library, e.g. libnuma, or because there is no library that yet
+ * provides the syscall.  These
+ */
+#define KVM_SYSCALL_DEFINE(name, nr_args, args...)			\
+static inline long name(DECLARE_ARGS(nr_args, args))			\
+{									\
+	return syscall(__NR_##name, UNPACK_ARGS(nr_args, args));	\
+}									\
+__KVM_SYSCALL_DEFINE(name, nr_args, args)
+
+/*
+ * Special case mmap(), as KVM selftest rarely/never specific an address,
+ * rarely specify an offset, and because the unique return code requires
+ * special handling anyways.
+ */
+static inline void *__kvm_mmap(size_t size, int prot, int flags, int fd,
+			       off_t offset)
+{
+	void *mem;
+
+	mem = mmap(NULL, size, prot, flags, fd, offset);
+	TEST_ASSERT(mem != MAP_FAILED, __KVM_SYSCALL_ERROR("mmap()",
+		    (int)(unsigned long)MAP_FAILED));
+	return mem;
+}
+
+static inline void *kvm_mmap(size_t size, int prot, int flags, int fd)
+{
+	return __kvm_mmap(size, prot, flags, fd, 0);
+}
+
+static inline int kvm_dup(int fd)
+{
+	int new_fd = dup(fd);
+
+	TEST_ASSERT(new_fd >= 0, __KVM_SYSCALL_ERROR("dup()", new_fd));
+	return new_fd;
+}
+
+__KVM_SYSCALL_DEFINE(munmap, 2, void *, mem, size_t, size);
+__KVM_SYSCALL_DEFINE(close, 1, int, fd);
+__KVM_SYSCALL_DEFINE(fallocate, 4, int, fd, int, mode, loff_t, offset, loff_t, len);
+__KVM_SYSCALL_DEFINE(ftruncate, 2, unsigned int, fd, off_t, length);
+
+#endif /* SELFTEST_KVM_SYSCALLS_H */