tools/testing/selftests/kvm/include/test_util.h

Source file repositories/reference/linux-study-clean/tools/testing/selftests/kvm/include/test_util.h

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/kvm/include/test_util.h
Extension
.h
Size
6726 bytes
Lines
244
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

struct guest_random_state {
	u32 seed;
};

extern u32 guest_random_seed;
extern struct guest_random_state guest_rng;

struct guest_random_state new_guest_random_state(u32 seed);
u32 guest_random_u32(struct guest_random_state *state);

static inline bool __guest_random_bool(struct guest_random_state *state,
				       u8 percent)
{
	return (guest_random_u32(state) % 100) < percent;
}

static inline bool guest_random_bool(struct guest_random_state *state)
{
	return __guest_random_bool(state, 50);
}

static inline u64 guest_random_u64(struct guest_random_state *state)
{
	return ((u64)guest_random_u32(state) << 32) | guest_random_u32(state);
}

enum vm_mem_backing_src_type {
	VM_MEM_SRC_ANONYMOUS,
	VM_MEM_SRC_ANONYMOUS_THP,
	VM_MEM_SRC_ANONYMOUS_HUGETLB,
	VM_MEM_SRC_ANONYMOUS_HUGETLB_16KB,
	VM_MEM_SRC_ANONYMOUS_HUGETLB_64KB,
	VM_MEM_SRC_ANONYMOUS_HUGETLB_512KB,
	VM_MEM_SRC_ANONYMOUS_HUGETLB_1MB,
	VM_MEM_SRC_ANONYMOUS_HUGETLB_2MB,
	VM_MEM_SRC_ANONYMOUS_HUGETLB_8MB,
	VM_MEM_SRC_ANONYMOUS_HUGETLB_16MB,
	VM_MEM_SRC_ANONYMOUS_HUGETLB_32MB,
	VM_MEM_SRC_ANONYMOUS_HUGETLB_256MB,
	VM_MEM_SRC_ANONYMOUS_HUGETLB_512MB,
	VM_MEM_SRC_ANONYMOUS_HUGETLB_1GB,
	VM_MEM_SRC_ANONYMOUS_HUGETLB_2GB,
	VM_MEM_SRC_ANONYMOUS_HUGETLB_16GB,
	VM_MEM_SRC_SHMEM,
	VM_MEM_SRC_SHARED_HUGETLB,
	NUM_SRC_TYPES,
};

#define DEFAULT_VM_MEM_SRC VM_MEM_SRC_ANONYMOUS

struct vm_mem_backing_src_alias {
	const char *name;
	u32 flag;
};

#define MIN_RUN_DELAY_NS	200000UL

bool thp_configured(void);
size_t get_trans_hugepagesz(void);
size_t get_def_hugetlb_pagesz(void);
const struct vm_mem_backing_src_alias *vm_mem_backing_src_alias(u32 i);
size_t get_backing_src_pagesz(u32 i);
bool is_backing_src_hugetlb(u32 i);
void backing_src_help(const char *flag);
enum vm_mem_backing_src_type parse_backing_src_type(const char *type_name);
long get_run_delay(void);
bool is_numa_balancing_enabled(void);

/*
 * Whether or not the given source type is shared memory (as opposed to
 * anonymous).
 */
static inline bool backing_src_is_shared(enum vm_mem_backing_src_type t)
{
	return vm_mem_backing_src_alias(t)->flag & MAP_SHARED;
}

static inline bool backing_src_can_be_huge(enum vm_mem_backing_src_type t)
{
	return t != VM_MEM_SRC_ANONYMOUS && t != VM_MEM_SRC_SHMEM;
}

/* Aligns x up to the next multiple of size. Size must be a power of 2. */
static inline u64 align_up(u64 x, u64 size)
{
	u64 mask = size - 1;

	TEST_ASSERT(size != 0 && !(size & (size - 1)),
		    "size not a power of 2: %lu", size);
	return ((x + mask) & ~mask);

Annotation

Implementation Notes