vmclock_abi
struct vmclock_abi *clk;
#define VMCLOCK_MIN_SIZE offsetof(struct vmclock_abi, pad)
(le32_to_cpu((_c)->size) >= (offsetof(struct vmclock_abi, _f) + \
static bool tai_adjust(struct vmclock_abi *clk, uint64_t *sec)