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