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1: #ifndef _ASM_X86_PVCLOCK_ABI_H 2: #define _ASM_X86_PVCLOCK_ABI_H 3: #ifndef __ASSEMBLY__ 4: 5: /* 6: * These structs MUST NOT be changed. 7: * They are the ABI between hypervisor and guest OS. 8: * Both Xen and KVM are using this. 9: * 10: * pvclock_vcpu_time_info holds the system time and the tsc timestamp 11: * of the last update. So the guest can use the tsc delta to get a 12: * more precise system time. There is one per virtual cpu. 13: * 14: * pvclock_wall_clock references the point in time when the system 15: * time was zero (usually boot time), thus the guest calculates the 16: * current wall clock by adding the system time. 17: * 18: * Protocol for the "version" fields is: hypervisor raises it (making 19: * it uneven) before it starts updating the fields and raises it again 20: * (making it even) when it is done. Thus the guest can make sure the 21: * time values it got are consistent by checking the version before 22: * and after reading them. 23: */ 24: 25: struct pvclock_vcpu_time_info { 26: u32 version; 27: u32 pad0; 28: u64 tsc_timestamp; 29: u64 system_time; 30: u32 tsc_to_system_mul; 31: s8 tsc_shift; 32: u8 flags; 33: u8 pad[2]; 34: } __attribute__((__packed__)); /* 32 bytes */ 35: 36: struct pvclock_wall_clock { 37: u32 version; 38: u32 sec; 39: u32 nsec; 40: } __attribute__((__packed__)); 41: 42: #define PVCLOCK_TSC_STABLE_BIT (1 << 0) 43: #define PVCLOCK_GUEST_STOPPED (1 << 1) 44: #endif /* __ASSEMBLY__ */ 45: #endif /* _ASM_X86_PVCLOCK_ABI_H */ 46: