Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/tools/testing/selftests/kvm/include/kvm_syscalls.h
38237 views
1
/* SPDX-License-Identifier: GPL-2.0-only */

2
#ifndef SELFTEST_KVM_SYSCALLS_H

3
#define SELFTEST_KVM_SYSCALLS_H

4


5
#include <sys/syscall.h>

6


7
#define MAP_ARGS0(m,...)

8
#define MAP_ARGS1(m,t,a,...) m(t,a)

9
#define MAP_ARGS2(m,t,a,...) m(t,a), MAP_ARGS1(m,__VA_ARGS__)

10
#define MAP_ARGS3(m,t,a,...) m(t,a), MAP_ARGS2(m,__VA_ARGS__)

11
#define MAP_ARGS4(m,t,a,...) m(t,a), MAP_ARGS3(m,__VA_ARGS__)

12
#define MAP_ARGS5(m,t,a,...) m(t,a), MAP_ARGS4(m,__VA_ARGS__)

13
#define MAP_ARGS6(m,t,a,...) m(t,a), MAP_ARGS5(m,__VA_ARGS__)

14
#define MAP_ARGS(n,...) MAP_ARGS##n(__VA_ARGS__)

15


16
#define __DECLARE_ARGS(t, a)	t a

17
#define __UNPACK_ARGS(t, a)	a

18


19
#define DECLARE_ARGS(nr_args, args...) MAP_ARGS(nr_args, __DECLARE_ARGS, args)

20
#define UNPACK_ARGS(nr_args, args...) MAP_ARGS(nr_args, __UNPACK_ARGS, args)

21


22
#define __KVM_SYSCALL_ERROR(_name, _ret) \

23
	"%s failed, rc: %i errno: %i (%s)", (_name), (_ret), errno, strerror(errno)

24


25
/* Define a kvm_<syscall>() API to assert success. */

26
#define __KVM_SYSCALL_DEFINE(name, nr_args, args...)			\

27
static inline void kvm_##name(DECLARE_ARGS(nr_args, args))		\

28
{									\

29
	int r;								\

30
									\

31
	r = name(UNPACK_ARGS(nr_args, args));				\

32
	TEST_ASSERT(!r, __KVM_SYSCALL_ERROR(#name, r));			\

33
}

34


35
/*

36
 * Macro to define syscall APIs, either because KVM selftests doesn't link to

37
 * the standard library, e.g. libnuma, or because there is no library that yet

38
 * provides the syscall.  These

39
 */

40
#define KVM_SYSCALL_DEFINE(name, nr_args, args...)			\

41
static inline long name(DECLARE_ARGS(nr_args, args))			\

42
{									\

43
	return syscall(__NR_##name, UNPACK_ARGS(nr_args, args));	\

44
}									\

45
__KVM_SYSCALL_DEFINE(name, nr_args, args)

46


47
/*

48
 * Special case mmap(), as KVM selftest rarely/never specific an address,

49
 * rarely specify an offset, and because the unique return code requires

50
 * special handling anyways.

51
 */

52
static inline void *__kvm_mmap(size_t size, int prot, int flags, int fd,

53
			       off_t offset)

54
{

55
	void *mem;

56


57
	mem = mmap(NULL, size, prot, flags, fd, offset);

58
	TEST_ASSERT(mem != MAP_FAILED, __KVM_SYSCALL_ERROR("mmap()",

59
		    (int)(unsigned long)MAP_FAILED));

60
	return mem;

61
}

62


63
static inline void *kvm_mmap(size_t size, int prot, int flags, int fd)

64
{

65
	return __kvm_mmap(size, prot, flags, fd, 0);

66
}

67


68
static inline int kvm_dup(int fd)

69
{

70
	int new_fd = dup(fd);

71


72
	TEST_ASSERT(new_fd >= 0, __KVM_SYSCALL_ERROR("dup()", new_fd));

73
	return new_fd;

74
}

75


76
__KVM_SYSCALL_DEFINE(munmap, 2, void *, mem, size_t, size);

77
__KVM_SYSCALL_DEFINE(close, 1, int, fd);

78
__KVM_SYSCALL_DEFINE(fallocate, 4, int, fd, int, mode, loff_t, offset, loff_t, len);

79
__KVM_SYSCALL_DEFINE(ftruncate, 2, unsigned int, fd, off_t, length);

80


81
#endif /* SELFTEST_KVM_SYSCALLS_H */

82


83